From feaa934ebd1ed79eb552bca268f50531bb8aeb8b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?=
 <157946706+jaewoo9797@users.noreply.github.com>
Date: Tue, 4 Feb 2025 09:23:43 +0900
Subject: [PATCH 01/38] feat: project migration spring boot

---
 .../1-sprint-mission/.gitattributes           |   3 +
 .../1-sprint-mission/.gitignore               |  32 ++----
 .../1-sprint-mission/README.md                |  96 +-----------------
 .../1-sprint-mission/build.gradle             |  40 ++++----
 .../gradle/wrapper/gradle-wrapper.jar         | Bin 60756 -> 43583 bytes
 .../gradle/wrapper/gradle-wrapper.properties  |   5 +-
 .../1-sprint-mission/gradlew                  |  44 +++++---
 .../1-sprint-mission/gradlew.bat              |  37 ++++---
 .../1-sprint-mission/settings.gradle          |   3 +-
 .../discodeit/DiscodeitApplication.java       |  13 +++
 .../src/main/resources/application.properties |   1 +
 .../discodeit/DiscodeitApplicationTests.java  |  13 +++
 12 files changed, 123 insertions(+), 164 deletions(-)
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/.gitattributes
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/DiscodeitApplication.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/resources/application.properties
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/DiscodeitApplicationTests.java

diff --git a/codeit-bootcamp-spring/1-sprint-mission/.gitattributes b/codeit-bootcamp-spring/1-sprint-mission/.gitattributes
new file mode 100644
index 000000000..8af972cde
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/.gitattributes
@@ -0,0 +1,3 @@
+/gradlew text eol=lf
+*.bat text eol=crlf
+*.jar binary
diff --git a/codeit-bootcamp-spring/1-sprint-mission/.gitignore b/codeit-bootcamp-spring/1-sprint-mission/.gitignore
index babb7212a..c2065bc26 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/.gitignore
+++ b/codeit-bootcamp-spring/1-sprint-mission/.gitignore
@@ -1,22 +1,11 @@
+HELP.md
 .gradle
 build/
 !gradle/wrapper/gradle-wrapper.jar
 !**/src/main/**/build/
 !**/src/test/**/build/
 
-### IntelliJ IDEA ###
-.idea/modules.xml
-.idea/jarRepositories.xml
-.idea/compiler.xml
-.idea/libraries/
-*.iws
-*.iml
-*.ipr
-out/
-!**/src/main/**/out/
-!**/src/test/**/out/
-
-### Eclipse ###
+### STS ###
 .apt_generated
 .classpath
 .factorypath
@@ -28,6 +17,15 @@ bin/
 !**/src/main/**/bin/
 !**/src/test/**/bin/
 
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
 ### NetBeans ###
 /nbproject/private/
 /nbbuild/
@@ -37,11 +35,3 @@ bin/
 
 ### VS Code ###
 .vscode/
-
-### Mac OS ###
-.DS_Store
-
-
-/build
-/build/test-results/
-/build/reports/
diff --git a/codeit-bootcamp-spring/1-sprint-mission/README.md b/codeit-bootcamp-spring/1-sprint-mission/README.md
index afa5c7d95..b27dfc5e9 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/README.md
+++ b/codeit-bootcamp-spring/1-sprint-mission/README.md
@@ -1,93 +1,5 @@
-간단하게 얼른 하고 끝내버리자.
-1. 서비스 구현체를 구현하라. -> 기존 유저 서비스의 구현
+프로젝트 마일스톤
 
-## 로직 생각해보기
-객체 직렬화를 사용해서 할 경우, 바이너리로 저장된다. 수정을 하고 싶은 경우 특정 부분만 삭제하거나, 수정하는 것이 어렵다
-=> 모든 저장 내용을 읽어들이고 파일을 새롭게 쓰는 방법이 쉬운 방법이다. 
-
-성능적으로 보면, 매우 안좋다고 볼 수 있다. 만약 파일에 저장된 데이터가 매우 많을 경우를 생각하면 읽고 새롭게 쓰고 하면 성능저하가 당연하다.
-
-데이터가 많을 경우 데이터베이스를 이용하는 것이 좋다.
-
-요구사항
-기본 요구사항
-File IO를 통한 데이터 영속화
-- [ ]  다음의 조건을 만족하는 서비스 인터페이스의 구현체를 작성하세요.
-
-- [ ]  클래스 패키지명: com.sprint.mission.discodeit.service.file
-
-- [ ]  클래스 네이밍 규칙: File[인터페이스 이름]
-
-- [ ]  JCF 대신 FileIO와 객체 직렬화를 활용해 메소드를 구현하세요.
-
-객체 직렬화/역직렬화 가이드
-
-- [ ]  Application에서 서비스 구현체를 File*Service로 바꾸어 테스트해보세요.
-
-서비스 구현체 분석
-- [ ] JCF*Service 구현체와 File*Service 구현체를 비교하여 공통점과 차이점을 발견해보세요.
-- [ ] "비즈니스 로직"과 관련된 코드를 식별해보세요.
-- [ ] "저장 로직"과 관련된 코드를 식별해보세요.    
-레포지토리 설계 및 구현
-- [ ] "저장 로직"과 관련된 기능을 도메인 모델 별 인터페이스로 선언하세요.
-- [ ] 인터페이스 패키지명: com.sprint.mission.discodeit.repository
-- [ ] 인터페이스 네이밍 규칙: [도메인 모델 이름]Repository
-- [ ] 다음의 조건을 만족하는 레포지토리 인터페이스의 구현체를 작성하세요.
-- [ ] 클래스 패키지명: com.sprint.mission.discodeit.repository.jcf
-- [ ] 클래스 네이밍 규칙: JCF[인터페이스 이름]
-- [ ] 기존에 구현한 JCF*Service 구현체의 "저장 로직"과 관련된 코드를 참고하여 구현하세요.
-- [ ] 다음의 조건을 만족하는 레포지토리 인터페이스의 구현체를 작성하세요.
-- [ ] 클래스 패키지명: com.sprint.mission.discodeit.repository.file
-- [ ] 클래스 네이밍 규칙: File[인터페이스 이름]
-- [ ] 기존에 구현한 File*Service 구현체의 "저장 로직"과 관련된 코드를 참고하여 구현하세요.
-심화 요구 사항
-관심사 분리를 통한 레이어 간 의존성 주입
-- [ ] 다음의 조건을 만족하는 서비스 인터페이스의 구현체를 작성하세요.
-- [ ] 클래스 패키지명: com.sprint.mission.discodeit.service.basic
-- [ ] 클래스 네이밍 규칙: Basic[인터페이스 이름]
-- [ ] 기존에 구현한 서비스 구현체의 "비즈니스 로직"과 관련된 코드를 참고하여 구현하세요.
-- [ ] 필요한 Repository 인터페이스를 필드로 선언하고 생성자를 통해 초기화하세요.
-- [ ] "저장 로직"은 Repository 인터페이스 필드를 활용하세요. (직접 구현하지 마세요.)
-- [ ] Basic*Service 구현체를 활용하여 테스트해보세요.
-코드 템플릿
-
-```java
-
-
-public class JavaApplication {
-    static User setupUser(UserService userService) {
-        User user = userService.create("woody", "woody@codeit.com", "woody1234");
-        return user;
-    }
-
-    static Channel setupChannel(ChannelService channelService) {
-        Channel channel = channelService.create(ChannelType.PUBLIC, "공지", "공지 채널입니다.");
-        return channel;
-    }
-
-    static void messageCreateTest(MessageService messageService, Channel channel, User author) {
-        Message message = messageService.create("안녕하세요.", channel.getId(), author.getId());
-        System.out.println("메시지 생성: " + message.getId());
-    }
-
-    public static void main(String[] args) {
-        // 서비스 초기화
-        // TODO Basic*Service 구현체를 초기화하세요.
-        UserService userService;
-        ChannelService channelService;
-        MessageService messageService;
-
-        // 셋업
-        User user = setupUser(userService);
-        Channel channel = setupChannel(channelService);
-        // 테스트
-        messageCreateTest(messageService, channel, user);
-    }
-}
-```
-
--  [ ]  JCF*Repository 구현체를 활용하여 테스트해보세요.
-
-- [ ]  File*Repository 구현체를 활용하여 테스트해보세요.
-
-- [ ] 이전에 작성했던 코드(JCF*Service 또는 File*Service)와 비교해 어떤 차이가 있는지 정리해보세요.
\ No newline at end of file
+- Java 프로젝트를 Spring 프로젝트로 마이그레이션
+- 의존성 관리를 IoC Container에 위임하도록 리팩토링
+- 비즈니스 로직 고도화
\ No newline at end of file
diff --git a/codeit-bootcamp-spring/1-sprint-mission/build.gradle b/codeit-bootcamp-spring/1-sprint-mission/build.gradle
index 96c0ec188..f211234fa 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/build.gradle
+++ b/codeit-bootcamp-spring/1-sprint-mission/build.gradle
@@ -1,32 +1,36 @@
 plugins {
     id 'java'
+    id 'org.springframework.boot' version '3.4.0'
+    id 'io.spring.dependency-management' version '1.1.7'
 }
 
 group = 'com.sprint.mission'
-version = '1.0-SNAPSHOT'
+version = '0.0.1-SNAPSHOT'
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(17)
+    }
+}
+
+configurations {
+    compileOnly {
+        extendsFrom annotationProcessor
+    }
+}
 
 repositories {
     mavenCentral()
 }
 
 dependencies {
-    testImplementation platform('org.junit:junit-bom:5.10.0')
-    testImplementation 'org.junit.jupiter:junit-jupiter'
-
-    // https://mvnrepository.com/artifact/org.mockito/mockito-core
-    testImplementation 'org.mockito:mockito-core:4.11.0'
-    // https://mvnrepository.com/artifact/org.assertj/assertj-core
-    testImplementation 'org.assertj:assertj-core:3.24.2'
-
-    // https://mvnrepository.com/artifact/org.hibernate.validator/hibernate-validator
-    implementation 'org.hibernate.validator:hibernate-validator:8.0.2.Final'
-    // https://mvnrepository.com/artifact/org.glassfish.expressly/expressly
-    implementation 'org.glassfish.expressly:expressly:5.0.0'
-    // https://mvnrepository.com/artifact/com.google.guava/guava
-    implementation 'com.google.guava:guava:33.2.1-jre'
-
+    implementation 'org.springframework.boot:spring-boot-starter-web'
+    compileOnly 'org.projectlombok:lombok'
+    annotationProcessor 'org.projectlombok:lombok'
+    testImplementation 'org.springframework.boot:spring-boot-starter-test'
+    testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
 }
 
-test {
+tasks.named('test') {
     useJUnitPlatform()
-}
\ No newline at end of file
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/gradle/wrapper/gradle-wrapper.jar b/codeit-bootcamp-spring/1-sprint-mission/gradle/wrapper/gradle-wrapper.jar
index 249e5832f090a2944b7473328c07c9755baa3196..a4b76b9530d66f5e68d973ea569d8e19de379189 100644
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zhJo7+<^7)qB>I;46!GySzdneZ>n_E1oWZY;kf94#)s)kWjuJN1c+wbVoNQcmnv}{>
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z?x$O#{du(<S~Tcw-wm+KV87yz$<g}Aw&`BzzwZ7*S)lh#H&`6YcV^kz4bZzc8<<74
zTVg_=YnyK3KuZig$=*P(YT6QgZ5w5ab8RRz^rUbD`bEoj(3{T<PpIR8sX1nHE{??k
LmiCMtn7{r93&V3<

diff --git a/codeit-bootcamp-spring/1-sprint-mission/gradle/wrapper/gradle-wrapper.properties b/codeit-bootcamp-spring/1-sprint-mission/gradle/wrapper/gradle-wrapper.properties
index 5fcc82948..e18bc253b 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/gradle/wrapper/gradle-wrapper.properties
+++ b/codeit-bootcamp-spring/1-sprint-mission/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,7 @@
-#Tue Jan 07 00:58:32 KST 2025
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.5-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.12.1-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/codeit-bootcamp-spring/1-sprint-mission/gradlew b/codeit-bootcamp-spring/1-sprint-mission/gradlew
index 1b6c78733..f5feea6d6 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/gradlew
+++ b/codeit-bootcamp-spring/1-sprint-mission/gradlew
@@ -15,6 +15,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
+# SPDX-License-Identifier: Apache-2.0
+#
 
 ##############################################################################
 #
@@ -55,7 +57,7 @@
 #       Darwin, MinGW, and NonStop.
 #
 #   (3) This script is generated from the Groovy template
-#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
 #       within the Gradle project.
 #
 #       You can find Gradle at https://github.com/gradle/gradle/.
@@ -80,13 +82,12 @@ do
     esac
 done
 
-APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
-
-APP_NAME="Gradle"
+# This is normally unused
+# shellcheck disable=SC2034
 APP_BASE_NAME=${0##*/}
-
-# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s
+' "$PWD" ) || exit
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD=maximum
@@ -133,22 +134,29 @@ location of your Java installation."
     fi
 else
     JAVACMD=java
-    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
 
 Please set the JAVA_HOME variable in your environment to match the
 location of your Java installation."
+    fi
 fi
 
 # Increase the maximum file descriptors if we can.
 if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
     case $MAX_FD in #(
       max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
         MAX_FD=$( ulimit -H -n ) ||
             warn "Could not query maximum file descriptor limit"
     esac
     case $MAX_FD in  #(
       '' | soft) :;; #(
       *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
         ulimit -n "$MAX_FD" ||
             warn "Could not set maximum file descriptor limit to $MAX_FD"
     esac
@@ -193,11 +201,15 @@ if "$cygwin" || "$msys" ; then
     done
 fi
 
-# Collect all arguments for the java command;
-#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
-#     shell script including quotes and variable substitutions, so put them in
-#     double quotes to make sure that they get re-expanded; and
-#   * put everything else in single quotes, so that it's not re-expanded.
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
 
 set -- \
         "-Dorg.gradle.appname=$APP_BASE_NAME" \
@@ -205,6 +217,12 @@ set -- \
         org.gradle.wrapper.GradleWrapperMain \
         "$@"
 
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
 # Use "xargs" to parse quoted args.
 #
 # With -n1 it outputs one arg per line, with the quotes and backslashes removed.
diff --git a/codeit-bootcamp-spring/1-sprint-mission/gradlew.bat b/codeit-bootcamp-spring/1-sprint-mission/gradlew.bat
index 107acd32c..9d21a2183 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/gradlew.bat
+++ b/codeit-bootcamp-spring/1-sprint-mission/gradlew.bat
@@ -13,8 +13,10 @@
 @rem See the License for the specific language governing permissions and
 @rem limitations under the License.
 @rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
 
-@if "%DEBUG%" == "" @echo off
+@if "%DEBUG%"=="" @echo off
 @rem ##########################################################################
 @rem
 @rem  Gradle startup script for Windows
@@ -25,7 +27,8 @@
 if "%OS%"=="Windows_NT" setlocal
 
 set DIRNAME=%~dp0
-if "%DIRNAME%" == "" set DIRNAME=.
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
 set APP_BASE_NAME=%~n0
 set APP_HOME=%DIRNAME%
 
@@ -40,13 +43,13 @@ if defined JAVA_HOME goto findJavaFromJavaHome
 
 set JAVA_EXE=java.exe
 %JAVA_EXE% -version >NUL 2>&1
-if "%ERRORLEVEL%" == "0" goto execute
+if %ERRORLEVEL% equ 0 goto execute
 
-echo.
-echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
 
 goto fail
 
@@ -56,11 +59,11 @@ set JAVA_EXE=%JAVA_HOME%/bin/java.exe
 
 if exist "%JAVA_EXE%" goto execute
 
-echo.
-echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
 
 goto fail
 
@@ -75,13 +78,15 @@ set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
 
 :end
 @rem End local scope for the variables with windows NT shell
-if "%ERRORLEVEL%"=="0" goto mainEnd
+if %ERRORLEVEL% equ 0 goto mainEnd
 
 :fail
 rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
 rem the _cmd.exe /c_ return code!
-if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
-exit /b 1
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
 
 :mainEnd
 if "%OS%"=="Windows_NT" endlocal
diff --git a/codeit-bootcamp-spring/1-sprint-mission/settings.gradle b/codeit-bootcamp-spring/1-sprint-mission/settings.gradle
index b71004546..2437dfb29 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/settings.gradle
+++ b/codeit-bootcamp-spring/1-sprint-mission/settings.gradle
@@ -1,2 +1 @@
-rootProject.name = '1-sprint-mission'
-
+rootProject.name = 'discodeit'
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/DiscodeitApplication.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/DiscodeitApplication.java
new file mode 100644
index 000000000..dbea429e2
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/DiscodeitApplication.java
@@ -0,0 +1,13 @@
+package com.sprint.mission.discodeit;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class DiscodeitApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(DiscodeitApplication.class, args);
+    }
+
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/resources/application.properties b/codeit-bootcamp-spring/1-sprint-mission/src/main/resources/application.properties
new file mode 100644
index 000000000..545cf9f09
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/resources/application.properties
@@ -0,0 +1 @@
+spring.application.name=discodeit
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/DiscodeitApplicationTests.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/DiscodeitApplicationTests.java
new file mode 100644
index 000000000..7ab8d98cb
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/DiscodeitApplicationTests.java
@@ -0,0 +1,13 @@
+package com.sprint.mission.discodeit;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class DiscodeitApplicationTests {
+
+    @Test
+    void contextLoads() {
+    }
+
+}

From f74a9434e0663698abff2b46b20fd24b060e7640 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?=
 <157946706+jaewoo9797@users.noreply.github.com>
Date: Tue, 4 Feb 2025 11:12:39 +0900
Subject: [PATCH 02/38] =?UTF-8?q?feat:=20=EA=B8=B0=EB=B3=B8=20=EC=9A=94?=
 =?UTF-8?q?=EA=B5=AC=EC=82=AC=ED=95=AD=20=EA=B5=AC=ED=98=84?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../1-sprint-mission/README.md                | 99 ++++++++++++++++++-
 .../1-sprint-mission/build.gradle             | 12 +++
 .../discodeit/DiscodeitApplication.java       | 68 ++++++++++++-
 .../discodeit/entity/channel/Channel.java     | 28 ++----
 .../entity/common/AbstractUUIDEntity.java     | 31 ++----
 .../entity/message/ChannelMessage.java        | 15 +--
 .../entity/message/DirectMessage.java         | 32 +-----
 .../user/entity/ParticipatedChannel.java      |  1 +
 .../discodeit/entity/user/entity/User.java    | 30 ++----
 .../entity/user/entity/UserName.java          |  8 +-
 .../file/FileAbstractRepository.java          | 28 ++----
 .../file/channel/FileChannelRepository.java   |  5 +-
 .../message/FileChannelMessageRepository.java |  8 +-
 .../message/FileDirectMessageRepository.java  |  4 +-
 .../file/user/FileUserRepository.java         |  2 +
 .../basic/BasicChannelMessageService.java     | 16 +--
 .../service/basic/BasicChannelService.java    | 14 +--
 .../basic/BasicDirectMessageService.java      | 14 +--
 .../service/basic/BasicUserService.java       | 12 +--
 .../service/channel/ChannelConverter.java     |  4 +-
 .../converter/ChannelMessageConverter.java    |  2 +
 .../converter/DirectMessageConverter.java     |  2 +
 .../discodeit/service/user/UserConverter.java |  7 +-
 ...pplication.properties => application.yaml} |  0
 .../entity/common/AbstractUUIDTest.java       |  6 +-
 25 files changed, 263 insertions(+), 185 deletions(-)
 rename codeit-bootcamp-spring/1-sprint-mission/src/main/resources/{application.properties => application.yaml} (100%)

diff --git a/codeit-bootcamp-spring/1-sprint-mission/README.md b/codeit-bootcamp-spring/1-sprint-mission/README.md
index b27dfc5e9..4e7efe866 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/README.md
+++ b/codeit-bootcamp-spring/1-sprint-mission/README.md
@@ -2,4 +2,101 @@
 
 - Java 프로젝트를 Spring 프로젝트로 마이그레이션
 - 의존성 관리를 IoC Container에 위임하도록 리팩토링
-- 비즈니스 로직 고도화
\ No newline at end of file
+- 비즈니스 로직 고도화
+  기본 요구사항
+  Spring 프로젝트 초기화
+ - [x] Spring Initializr를 통해 zip 파일을 다운로드하세요.
+   - [x] 빌드 시스템은 Gradle - Groovy를 사용합니다.
+   - [x] 언어는 Java 17를 사용합니다.
+   - [x] Spring Boot의 버전은 3.4.0입니다.
+   - [x] GroupId는 com.sprint.mission입니다.
+   - [x] ArtifactId와 Name은 discodeit입니다.
+   - [x] packaging 형식은 Jar입니다
+   - [x] Dependency를 추가합니다.
+   - [x] Lombok
+   - [x] Spring Web
+ - [x] zip 파일을 압축해제하고 원래 진행 중이던 프로젝트에 붙여넣기하세요. 일부 파일은 덮어쓰기할 수 있습니다.
+   - [x] application.properties 파일을 yaml 형식으로 변경하세요.
+   - [x] DiscodeitApplication의 main 메서드를 실행하고 로그를 확인해보세요.
+
+
+---
+
+Bean 선언 및 테스트
+- [x] File*Repository 구현체를 Repository 인터페이스의 Bean으로 등록하세요.
+- [x] Basic*Service 구현체를 Service 인터페이스의 Bean으로 등록하세요.
+- [x] JavaApplication에서 테스트했던 코드를 DiscodeitApplication에서 테스트해보세요.
+  - [x]  JavaApplication 의 main 메소드를 제외한 모든 메소드를 DiscodeitApplication클래스로 복사하세요.
+  - [x]  JavaApplication의 main 메소드에서 Service를 초기화하는 코드를 Spring Context를 활용하여 대체하세요.
+
+```java
+// JavaApplication
+public static void main(String[] args) {
+    // 레포지토리 초기화
+    // ...
+    // 서비스 초기화
+      UserService userService = new BasicUserService(userRepository);
+    ChannelService channelService = new BasicChannelService(channelRepository);
+    MessageService messageService = new BasicMessageService(messageRepository, channelRepository, userRepository);
+
+    // ...
+}
+
+// DiscodeitApplication
+public static void main(String[] args) {
+        ConfigurableApplicationContext context = SpringApplication.run(DiscodeitApplication.class, args);
+    // 서비스 초기화
+        // TODO context에서 Bean을 조회하여 각 서비스 구현체 할당 코드 작성하세요.
+      UserService userService;
+    ChannelService channelService;
+    MessageService messageService;
+
+    // ...
+}
+```
+
+   - [x]  JavaApplication의 main 메소드의 셋업, 테스트 부분의 코드를 DiscodeitApplication클래스로 복사하세요.
+```java
+public static void main(String[] args) {
+    // ...
+    // 셋업
+    User user = setupUser(userService);
+    Channel channel = setupChannel(channelService);
+    // 테스트
+    messageCreateTest(messageService, channel, user);
+}
+```
+
+Spring 핵심 개념 이해하기
+- [ ] JavaApplication과 DiscodeitApplication에서 Service를 초기화하는 방식의 차이에 대해 다음의 키워드를 중심으로 정리해보세요.   
+IoC Container   
+Dependency Injection   
+Bean   
+
+
+Lombok 적용
+- [x] 도메인 모델의 getter 메소드를 @Getter로 대체해보세요.
+- [x] Basic*Service의 생성자를 @RequiredArgsConstructor로 대체해보세요.
+
+
+비즈니스 로직 고도화
+- [ ]  다음의 기능 요구 사항을 구현하세요.
+
+추가 기능 요구사항
+시간 타입 변경하기
+- [ ] 시간을 다루는 필드의 타입은 Instant로 통일합니다.
+  - 기존에 사용하던 Long보다 가독성이 뛰어나며, 시간대(Time Zone) 변환과 정밀한 시간 연산이 가능해 확장성이 높습니다.  
+
+**새로운 도메인 추가하기**
+- [ ] 공통: 앞서 정의한 도메인 모델과 동일하게 공통 필드(id, createdAt, updatedAt)를 포함합니다.
+- [ ] ReadStatus
+  - 사용자가 채널 별 마지막으로 메시지를 읽은 시간을 표현하는 도메인 모델입니다. 사용자별 각 채널에 읽지 않은 메시지를 확인하기 위해 활용합니다.
+- [ ] UserStatus
+  - 사용자 별 마지막으로 확인된 접속 시간을 표현하는 도메인 모델입니다. 사용자의 온라인 상태를 확인하기 위해 활용합니다.
+  - [ ] 마지막 접속 시간을 기준으로 현재 로그인한 유저로 판단할 수 있는 메소드를 정의하세요. 마지막 접속 시간이 현재 시간으로부터 5분 이내이면 현재 접속 중인 유저로 간주합니다.
+- [ ] BinaryContent
+  - 이미지, 파일 등 바이너리 데이터를 표현하는 도메인 모델입니다. 사용자의 프로필 이미지, 메시지에 첨부된 파일을 저장하기 위해 활용합니다.
+  - [ ] 수정 불가능한 도메인 모델로 간주합니다. 따라서 updatedAt 필드는 정의하지 않습니다.
+  - [ ] User, Message 도메인 모델과의 의존 관계 방향성을 잘 고려하여 id 참조 필드를 추가하세요.
+- [ ] 각 도메인 모델 별 레포지토리 인터페이스를 선언하세요.
+레포지토리 구현체(File, JCF)는 아직 구현하지 마세요. 이어지는 서비스 고도화 요구사항에 따라 레포지토리 인터페이스에 메소드가 추가될 수 있어요.
\ No newline at end of file
diff --git a/codeit-bootcamp-spring/1-sprint-mission/build.gradle b/codeit-bootcamp-spring/1-sprint-mission/build.gradle
index f211234fa..040627196 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/build.gradle
+++ b/codeit-bootcamp-spring/1-sprint-mission/build.gradle
@@ -29,6 +29,18 @@ dependencies {
     annotationProcessor 'org.projectlombok:lombok'
     testImplementation 'org.springframework.boot:spring-boot-starter-test'
     testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
+
+    // https://mvnrepository.com/artifact/org.mockito/mockito-core
+    testImplementation 'org.mockito:mockito-core:4.11.0'
+    // https://mvnrepository.com/artifact/org.assertj/assertj-core
+    testImplementation 'org.assertj:assertj-core:3.24.2'
+
+    // https://mvnrepository.com/artifact/org.hibernate.validator/hibernate-validator
+    implementation 'org.hibernate.validator:hibernate-validator:8.0.2.Final'
+    // https://mvnrepository.com/artifact/org.glassfish.expressly/expressly
+    implementation 'org.glassfish.expressly:expressly:5.0.0'
+    // https://mvnrepository.com/artifact/com.google.guava/guava
+    implementation 'com.google.guava:guava:33.2.1-jre'
 }
 
 tasks.named('test') {
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/DiscodeitApplication.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/DiscodeitApplication.java
index dbea429e2..d6d51329f 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/DiscodeitApplication.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/DiscodeitApplication.java
@@ -1,13 +1,79 @@
 package com.sprint.mission.discodeit;
 
+import com.sprint.mission.discodeit.entity.channel.dto.ChannelResponse;
+import com.sprint.mission.discodeit.entity.channel.dto.CreateNewChannelRequest;
+import com.sprint.mission.discodeit.entity.message.dto.DirectMessageInfoResponse;
+import com.sprint.mission.discodeit.entity.message.dto.SendDirectMessageRequest;
+import com.sprint.mission.discodeit.entity.user.dto.RegisterUserRequest;
+import com.sprint.mission.discodeit.entity.user.dto.UserInfoResponse;
+import com.sprint.mission.discodeit.repository.file.channel.FileChannelRepository;
+import com.sprint.mission.discodeit.repository.file.message.FileDirectMessageRepository;
+import com.sprint.mission.discodeit.repository.file.user.FileUserRepository;
+import com.sprint.mission.discodeit.repository.jcf.channel.ChannelRepository;
+import com.sprint.mission.discodeit.repository.jcf.message.directMessage.DirectMessageRepository;
+import com.sprint.mission.discodeit.repository.jcf.user.UserRepository;
+import com.sprint.mission.discodeit.service.channel.ChannelService;
+import com.sprint.mission.discodeit.service.message.directMessage.DirectMessageService;
+import com.sprint.mission.discodeit.service.user.UserService;
+import java.util.UUID;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.ConfigurableApplicationContext;
 
 @SpringBootApplication
 public class DiscodeitApplication {
+    private static UserService userService;
+    private static ChannelService channelService;
+    private static DirectMessageService directMessageService;
 
     public static void main(String[] args) {
-        SpringApplication.run(DiscodeitApplication.class, args);
+        ConfigurableApplicationContext appContext = SpringApplication.run(DiscodeitApplication.class, args);
+        userService = appContext.getBean(UserService.class);
+        channelService = appContext.getBean(ChannelService.class);
+        directMessageService = appContext.getBean(DirectMessageService.class);
+
+        UserInfoResponse user = registerUser(userService);
+        ChannelResponse channelResponse = registerChannel(channelService, user.uuid());
+        UserInfoResponse destinationUser = registerUser(userService);
+        DirectMessageInfoResponse sendDirectMessage = sendDirectMessage(directMessageService,user.uuid(), destinationUser.uuid());
+
+        saveToFile(appContext);
+    }
+
+    private static UserInfoResponse registerUser(UserService userService) {
+        var registerRequest = new RegisterUserRequest("홍길동");
+        return userService.register(registerRequest);
+    }
+
+    private static ChannelResponse registerChannel(ChannelService channelService, UUID userId) {
+        var channelCreateRequest = new CreateNewChannelRequest(userId, "스프링부트_1기");
+        return channelService.createChannelOrThrow(channelCreateRequest);
+    }
+
+    private static DirectMessageInfoResponse sendDirectMessage(DirectMessageService directMessageService, UUID sendUserId, UUID receiveUserId) {
+        var sendDirectMessageRequest = new SendDirectMessageRequest(sendUserId, receiveUserId, "안녕하세요");
+        return directMessageService.sendMessage(sendDirectMessageRequest);
     }
 
+    private static void saveToFile(ConfigurableApplicationContext appContext) {
+        saveChannelToFile(appContext);
+        saveUserToFile(appContext);
+        saveDirectMessageToFile(appContext);
+    }
+
+    private static void saveUserToFile(ConfigurableApplicationContext appContext) {
+        FileUserRepository fileUserRepository = (FileUserRepository) appContext.getBean(UserRepository.class);
+        fileUserRepository.saveToFile();
+    }
+
+    private static void saveChannelToFile(ConfigurableApplicationContext appContext) {
+        FileChannelRepository fileChannelRepository = (FileChannelRepository) appContext.getBean(ChannelRepository.class);
+        fileChannelRepository.saveToFile();
+    }
+
+    private static void saveDirectMessageToFile(ConfigurableApplicationContext appContext) {
+        FileDirectMessageRepository fileDirectMessageRepository =
+                (FileDirectMessageRepository) appContext.getBean(DirectMessageRepository.class);
+        fileDirectMessageRepository.saveToFile();
+    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/channel/Channel.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/channel/Channel.java
index 93b312c97..e54da0b2a 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/channel/Channel.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/channel/Channel.java
@@ -7,7 +7,9 @@
 import com.sprint.mission.discodeit.entity.user.entity.User;
 import jakarta.validation.constraints.NotNull;
 import jakarta.validation.constraints.Size;
+import lombok.Getter;
 
+@Getter
 public class Channel extends AbstractUUIDEntity {
 
     @NotNull
@@ -19,18 +21,6 @@ public class Channel extends AbstractUUIDEntity {
 
     private final User creator;
 
-    /**
-     *  ==> 코드 리뷰 받고 싶은 부분
-     *  필드에 참여한 유저의 객체를 참조하고 있는 자료구조를 추가하고 싶습니다. ex) private ParticipatedUser participatedUsers
-     *  생각되는 문제는 순환참조로 어떻게 끊어줄 수 있을까입니다
-     *  1. userId 만 저장하고 있는 자료구조 -> 데이터베이스식은 객체지향 코딩에서 거리가 먼것 같아 저는 지양합니다.
-     *  2. User 객체를 담은 자료구조 -> 유저가 소유한 채널 중 해당 채널을 찾아, 채널에 대한 정보를 참조한다.
-     *                              -> 채널에 참가한 유저 객체를 참조한다 .. 무한루프..
-     *  3. 생각되는 문제점 : 디비는 스프링부트로 기능이 있는것으로 알지만, 파일 시스템으로 직접 구현할 경우 막막함,
-     *      일단 해보지 않았지만, 어떤 방식으로 생각해야하는지 ?
-     */
-
-
     private Channel(String channelName, User creator) {
         this.channelName = channelName;
         this.creator = creator;
@@ -66,17 +56,13 @@ public boolean isStatusNotUnregisteredAndEqualsTo(String channelName) {
         return isNotUnregistered() && this.channelName.equals(channelName);
     }
 
-    public String getChannelName() {
-        return channelName;
-    }
-
     private void checkCreatorEqualsOrThrow(User user) {
         var isNotCreator = isNotCreator(user);
 
         if (isNotCreator) {
             throw ChannelException.ofErrorMessageAndCreatorName(
                     ErrorMessage.CHANNEL_NOT_EQUAL_CREATOR,
-                    user.getName()
+                    user.getUserName()
             );
         }
     }
@@ -86,8 +72,8 @@ private boolean isNotCreator(User user) {
         return !creator.equals(user);
     }
 
-    public String getCreator() {
-        return creator.getName();
+    public String getCreatorName() {
+        return creator.getUserName();
     }
 
     @Override
@@ -97,8 +83,8 @@ public String toString() {
                 "channel info = [channel name = %s creator = %s, createAt = %d, updateAt = %d, status = %s]",
                         channelName,
                         creator.getName(),
-                        getCreateAt(),
-                        getUpdateAt().orElse(0L),
+                        getCreateAt().toEpochMilli(),
+                        getUpdateAt().toEpochMilli(),
                         getStatus().toString()
         );
         return format;
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/common/AbstractUUIDEntity.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/common/AbstractUUIDEntity.java
index 2e0d90a7f..9ef9d85bc 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/common/AbstractUUIDEntity.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/common/AbstractUUIDEntity.java
@@ -7,45 +7,30 @@
 import com.google.common.base.Preconditions;
 import java.io.Serial;
 import java.io.Serializable;
-import java.time.LocalDateTime;
-import java.time.ZoneId;
-import java.util.Optional;
+import java.time.Instant;
 import java.util.UUID;
+import lombok.Getter;
 
+@Getter
 public abstract class AbstractUUIDEntity implements Serializable {
 
     @Serial
     private static final long serialVersionUID = -2898060967687082469L;
     private final UUID id;
 
-    private final Long createAt;
+    private final Instant createAt;
 
-    private Long updateAt = null;
+    private Instant updateAt;
 
     private Status status;
 
     protected AbstractUUIDEntity() {
         this.id = UUID.randomUUID();
         this.createAt = createUnixTimestamp();
+        this.updateAt = createUnixTimestamp();
         this.status = REGISTERED;
     }
 
-    public Optional<Long> getUpdateAt() {
-        return Optional.ofNullable(updateAt);
-    }
-
-    public UUID getId() {
-        return id;
-    }
-
-    public Long getCreateAt() {
-        return createAt;
-    }
-
-    public Status getStatus() {
-        return status;
-    }
-
     private void updateStatus(Status status) {
         Preconditions.checkNotNull(status);
         this.status = status;
@@ -64,8 +49,8 @@ public boolean isNotUnregistered() {
         return status != UNREGISTERED;
     }
 
-    private long createUnixTimestamp() {
-        return LocalDateTime.now().atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
+    private Instant createUnixTimestamp() {
+        return Instant.now();
     }
 
     @Override
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/ChannelMessage.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/ChannelMessage.java
index d8354c4d5..8bc8197d4 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/ChannelMessage.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/ChannelMessage.java
@@ -3,7 +3,9 @@
 import com.sprint.mission.discodeit.entity.channel.Channel;
 import com.sprint.mission.discodeit.entity.common.AbstractUUIDEntity;
 import com.sprint.mission.discodeit.entity.user.entity.User;
+import lombok.Getter;
 
+@Getter
 public class ChannelMessage extends AbstractUUIDEntity {
 
     private final Sender<User, Channel> sender;
@@ -41,19 +43,6 @@ public static ChannelMessage ofMessageAndSenderAndReceiverChannel(
         return new ChannelMessage(channelSender, message, messageSender, receiverChannel);
     }
 
-    public String getMessage() {
-        return message;
-    }
-
-    public User getMessageSender() {
-        return messageSender;
-    }
-
-    public Channel getReceiverChannel() {
-        return receiverChannel;
-    }
-
-    // 채널에 속한 모든 사람들에게 알림을 전송해야겠네 ?
     public void sendMessage() {
         sender.sendMessage(messageSender, receiverChannel, message);
     }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/DirectMessage.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/DirectMessage.java
index d0489d76a..396c88110 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/DirectMessage.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/DirectMessage.java
@@ -2,10 +2,12 @@
 
 import com.sprint.mission.discodeit.entity.common.AbstractUUIDEntity;
 import com.sprint.mission.discodeit.entity.user.entity.User;
+import lombok.Getter;
 
+@Getter
 public class DirectMessage extends AbstractUUIDEntity {
     // 보내는 방법을 추상화
-    private final Sender<User, User> sender;
+    private final transient Sender<User, User> sender;
 
     private final String message;
 
@@ -37,30 +39,4 @@ public void sendMessage() {
         sender.sendMessage(messageSender, messageReceiver, message);
     }
 
-    public String getMessage() {
-        return message;
-    }
-
-    public User getMessageSender() {
-        return messageSender;
-    }
-
-    public User getMessageReceiver() {
-        return messageReceiver;
-    }
-}
-/**
- *  메세지를 주고 받는 행위를 어떻게 처리해주어야 할까?
- *  1. 유저가 메시지를 발송한다.
- *  2. 애플리케이션에서 메시지를 저장한다.
- *  3. 애플리케이션에서 메시지 알림을 전송한다.
- *  4. 받은 유저가 알림을 확인하고, 메시지를 확인한다. 메시지를 확인할 때 기존의 주고받은 메시지도 모두 들고 와야함 => 서비스 레포에서 처리해야할 일 같음
- */
-
-/**
- *  메시지가 저장할 데이터는 ?
- *  1. 메시지 원문
- *  2. 보낸 사람
- *  3. 받는 사람
- *  etc. 메시지 원문 말고, 사진(url 포함), 다양한 것을 보낼 수 있는데 저장할지 확실하지 않은 데이터를 필드로 가지고 있어야하는가?
- */
\ No newline at end of file
+}
\ No newline at end of file
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/entity/ParticipatedChannel.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/entity/ParticipatedChannel.java
index b5edbf355..12d051197 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/entity/ParticipatedChannel.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/entity/ParticipatedChannel.java
@@ -14,6 +14,7 @@
 import java.util.Map;
 import java.util.Optional;
 import java.util.UUID;
+import lombok.Getter;
 
 public class ParticipatedChannel implements Serializable {
 
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/entity/User.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/entity/User.java
index e783ae631..bf7ec82a9 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/entity/User.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/entity/User.java
@@ -4,9 +4,12 @@
 import com.google.common.base.Preconditions;
 import com.sprint.mission.discodeit.entity.channel.Channel;
 import com.sprint.mission.discodeit.entity.common.AbstractUUIDEntity;
+import java.time.Instant;
 import java.util.List;
 import java.util.UUID;
+import lombok.Getter;
 
+@Getter
 public class User extends AbstractUUIDEntity {
 
     private UserName name;
@@ -32,17 +35,6 @@ public void changeUserName(String newName) {
         updateStatusAndUpdateAt();
     }
 
-    /**
-     *  유저에게 채널을 생성하는 책임이 있는 것이아니라,
-     *  다른 객체에 해당 작업을 위임, 그런데 메서드 명이 영...
-     *  이 부분 코드 리뷰 부탁드릴게요!
-     */
-
-    /**
-     * 유저의 참여 채널에 새로운 채널을 생성하는 메서드
-     * @param channelName
-     * @return
-     */
     public Channel openNewChannel(String channelName) {
         Preconditions.checkNotNull(channelName);
         var createdChannel = participatedChannels.createChannel(channelName, this);
@@ -57,10 +49,6 @@ public Channel changeChannelName(UUID channelId, String channelName) {
         return targetChannel;
     }
 
-    /**
-     * 참여한 채널에서 나가는 메서드
-     * @param channelId
-     */
     public void exitParticipatedChannel(UUID channelId) {
         participatedChannels.exitChannelById(channelId);
     }
@@ -74,14 +62,12 @@ public List<Channel> getParticipatedChannels() {
         return participatedChannels.findAllChannels();
     }
 
-    public String getName() {
-        return name.getName();
-    }
-
     public void unregister() {
         updateUnregistered();
     }
-
+    public String getUserName() {
+        return name.getName();
+    }
     @Override
     public String toString() {
         var format =
@@ -90,8 +76,8 @@ public String toString() {
                         getId(),
                         getName(),
                         getStatus().toString(),
-                        getCreateAt(),
-                        getUpdateAt().orElse(0L),
+                        getCreateAt().toEpochMilli(),
+                        getUpdateAt().toEpochMilli(),
                         getParticipatedChannels()
                 );
 
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/entity/UserName.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/entity/UserName.java
index a2838e354..9c3e7282a 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/entity/UserName.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/entity/UserName.java
@@ -7,7 +7,9 @@
 import java.io.Serial;
 import java.io.Serializable;
 import java.util.Objects;
+import lombok.Getter;
 
+@Getter
 public class UserName implements Serializable {
 
     public static final int NAME_MIN_LENGTH = 3;
@@ -19,7 +21,7 @@ public class UserName implements Serializable {
             min = NAME_MIN_LENGTH, max = NAME_MAX_LENGTH,
             message = "'${validatedValue}' must be between {min} and {max} characters long"
     )
-    @NotNull    //TODO : => NotBlank , 테스트 코드 수정 후 변경
+    @NotNull
     private final String name;
 
     public UserName(String name) {
@@ -36,10 +38,6 @@ public UserName changeName(String name) {
         return new UserName(name);
     }
 
-    public String getName() {
-        return name;
-    }
-
     @Override
     public String toString() {
         return name;
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/FileAbstractRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/FileAbstractRepository.java
index a90c6ad84..4f1e2d0b8 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/FileAbstractRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/FileAbstractRepository.java
@@ -15,10 +15,9 @@
 import java.util.UUID;
 
 public abstract class FileAbstractRepository<T extends AbstractUUIDEntity, ID extends UUID>
-        extends InMemoryCrudRepository<T, ID>
-        implements Closeable {
+        extends InMemoryCrudRepository<T, ID> {
 
-    private File file;
+    private final File file;
 
     protected FileAbstractRepository(String filePath) {
         file = new File(filePath);
@@ -34,16 +33,14 @@ protected Map<UUID, T> loadFile() {
                 FileInputStream fis = new FileInputStream(file);
                 ObjectInputStream ois = new ObjectInputStream(fis);
         ) {
-            while (true) {
-                try {
-                    var readUser = (T) ois.readObject();
-                    store.put(readUser.getId(), readUser);
-                } catch (ClassNotFoundException e) {
-                    System.out.println(e.getMessage());
-                }
+            try {
+                store = (Map<UUID, T>) ois.readObject();
+            } catch (ClassNotFoundException e) {
+                System.out.println(e.getMessage());
             }
         } catch (IOException e) {
-            System.out.println("User loading exit");
+            System.out.println("loading exit");
+            throw new IllegalArgumentException();
         }
         return store;
     }
@@ -54,18 +51,11 @@ public void saveToFile() {
                 FileOutputStream fos = new FileOutputStream(file);
                 ObjectOutputStream oos = new ObjectOutputStream(fos);
         ) {
-
-            for (T value : store.values()) {
-                oos.writeObject(value);
-            }
+            oos.writeObject(store);
         } catch (IOException e) {
             throw new RuntimeException(e);
         }
     }
 
-    @Override
-    public void close() throws IOException {
-        saveToFile();
-    }
 }
 
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/channel/FileChannelRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/channel/FileChannelRepository.java
index 49b2e2033..5995be58a 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/channel/FileChannelRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/channel/FileChannelRepository.java
@@ -4,9 +4,12 @@
 import com.sprint.mission.discodeit.repository.jcf.channel.ChannelRepository;
 import com.sprint.mission.discodeit.repository.file.FileAbstractRepository;
 import java.util.UUID;
+import org.springframework.stereotype.Component;
+import org.springframework.stereotype.Repository;
 
+@Repository
 public class FileChannelRepository extends FileAbstractRepository<Channel, UUID> implements ChannelRepository {
-    private static final String CHANNEL_FILE_PATH_NAME = "temp/file/user/channel.ser";
+    private static final String CHANNEL_FILE_PATH_NAME = "temp/file/channel/channel.ser";
     private static ChannelRepository FILE_USER_REPOSITORY_INSTANCE;
 
     protected FileChannelRepository() {
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/message/FileChannelMessageRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/message/FileChannelMessageRepository.java
index 1ba6fd4a1..55ca813c2 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/message/FileChannelMessageRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/message/FileChannelMessageRepository.java
@@ -4,7 +4,9 @@
 import com.sprint.mission.discodeit.repository.file.FileAbstractRepository;
 import com.sprint.mission.discodeit.repository.jcf.message.ChannelMessage.ChannelMessageRepository;
 import java.util.UUID;
+import org.springframework.stereotype.Repository;
 
+@Repository
 public class FileChannelMessageRepository extends FileAbstractRepository<ChannelMessage, UUID>
         implements ChannelMessageRepository {
 
@@ -12,14 +14,14 @@ public class FileChannelMessageRepository extends FileAbstractRepository<Channel
     private static ChannelMessageRepository INSTANCE;
 
 
-    protected FileChannelMessageRepository(String filePath) {
-        super(filePath);
+    protected FileChannelMessageRepository() {
+        super(CHANNEL_MESSAGE_FILE_PATH_NAME);
         store.putAll(loadFile());
     }
 
     public static ChannelMessageRepository getInstance() {
         if (INSTANCE == null) {
-            INSTANCE = new FileChannelMessageRepository(CHANNEL_MESSAGE_FILE_PATH_NAME);
+            INSTANCE = new FileChannelMessageRepository();
         }
         return INSTANCE;
     }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/message/FileDirectMessageRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/message/FileDirectMessageRepository.java
index ab2e79264..68db4315a 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/message/FileDirectMessageRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/message/FileDirectMessageRepository.java
@@ -4,10 +4,12 @@
 import com.sprint.mission.discodeit.repository.file.FileAbstractRepository;
 import com.sprint.mission.discodeit.repository.jcf.message.directMessage.DirectMessageRepository;
 import java.util.UUID;
+import org.springframework.stereotype.Repository;
 
+@Repository
 public class FileDirectMessageRepository extends FileAbstractRepository<DirectMessage, UUID> implements
         DirectMessageRepository {
-    private static final String DIRECT_MESSAGE_FILE_PATH_NAME = "temp/file/user/channel.ser";
+    private static final String DIRECT_MESSAGE_FILE_PATH_NAME = "temp/file/message/directmessage.ser";
     private static FileDirectMessageRepository FILE_DIRECT_REPOSITORY_INSTANCE;
 
     protected FileDirectMessageRepository() {
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/user/FileUserRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/user/FileUserRepository.java
index bef1ebc48..3d7677e13 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/user/FileUserRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/user/FileUserRepository.java
@@ -5,7 +5,9 @@
 import com.sprint.mission.discodeit.repository.jcf.user.UserRepository;
 import java.util.Optional;
 import java.util.UUID;
+import org.springframework.stereotype.Repository;
 
+@Repository
 public class FileUserRepository extends FileAbstractRepository<User, UUID> implements UserRepository {
     private static final String FILE_PATH_USER_NAME = "temp/file/user/user.ser";
     private static UserRepository FILE_USER_REPOSITORY_INSTANCE;
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/basic/BasicChannelMessageService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/basic/BasicChannelMessageService.java
index 8a3c613e2..276a0c165 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/basic/BasicChannelMessageService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/basic/BasicChannelMessageService.java
@@ -14,7 +14,11 @@
 import com.sprint.mission.discodeit.service.message.channelMessage.ChannelMessageService;
 import com.sprint.mission.discodeit.service.message.converter.ChannelMessageConverter;
 import java.util.UUID;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
 
+@Service
+@RequiredArgsConstructor
 public class BasicChannelMessageService implements ChannelMessageService {
 
     private final UserRepository userRepository;
@@ -22,18 +26,6 @@ public class BasicChannelMessageService implements ChannelMessageService {
     private final ChannelMessageRepository channelMessageRepository;
     private final ChannelMessageConverter converter;
 
-    private BasicChannelMessageService(
-            UserRepository userRepository,
-            ChannelRepository channelRepository,
-            ChannelMessageRepository channelMessageRepository,
-            ChannelMessageConverter converter
-    ) {
-        this.userRepository = userRepository;
-        this.channelRepository = channelRepository;
-        this.channelMessageRepository = channelMessageRepository;
-        this.converter = converter;
-    }
-
     public static ChannelMessageService getInstance(
             UserRepository userRepository,
             ChannelRepository channelRepository,
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/basic/BasicChannelService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/basic/BasicChannelService.java
index 2ffd1e9c0..80095c8bd 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/basic/BasicChannelService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/basic/BasicChannelService.java
@@ -15,23 +15,17 @@
 import com.sprint.mission.discodeit.service.channel.ChannelConverter;
 import com.sprint.mission.discodeit.service.channel.ChannelService;
 import java.util.UUID;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
 
+@Service
+@RequiredArgsConstructor
 public class BasicChannelService implements ChannelService {
 
     private final ChannelRepository channelRepository;
     private final UserRepository userRepository;
     private final ChannelConverter channelConverter;
 
-    private BasicChannelService(
-            ChannelRepository channelRepository,
-            UserRepository userRepository,
-            ChannelConverter channelConverter
-    ) {
-        this.channelRepository = channelRepository;
-        this.userRepository = userRepository;
-        this.channelConverter = channelConverter;
-    }
-
     public static ChannelService getInstance(UserRepository userRepository, ChannelRepository channelRepository) {
         return new BasicChannelService(channelRepository, userRepository, new ChannelConverter());
     }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/basic/BasicDirectMessageService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/basic/BasicDirectMessageService.java
index 08d8ed5f4..4d1507865 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/basic/BasicDirectMessageService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/basic/BasicDirectMessageService.java
@@ -11,23 +11,17 @@
 import com.sprint.mission.discodeit.service.message.converter.DirectMessageConverter;
 import com.sprint.mission.discodeit.service.message.directMessage.DirectMessageService;
 import java.util.UUID;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
 
+@Service
+@RequiredArgsConstructor
 public class BasicDirectMessageService implements DirectMessageService {
 
     private final DirectMessageRepository directMessageRepository;
     private final UserRepository userRepository;
     private final DirectMessageConverter directMessageConverter;
 
-    private BasicDirectMessageService(
-            DirectMessageRepository directMessageRepository,
-            UserRepository userRepository,
-            DirectMessageConverter directMessageConverter
-    ) {
-        this.directMessageRepository = directMessageRepository;
-        this.userRepository = userRepository;
-        this.directMessageConverter = directMessageConverter;
-    }
-
     public static DirectMessageService getInstance(
             DirectMessageRepository directMessageRepository,
             UserRepository userRepository
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/basic/BasicUserService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/basic/BasicUserService.java
index c5ce66fa7..c4370364b 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/basic/BasicUserService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/basic/BasicUserService.java
@@ -14,20 +14,16 @@
 import com.sprint.mission.discodeit.service.user.UserConverter;
 import com.sprint.mission.discodeit.service.user.UserService;
 import java.util.UUID;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
 
+@Service
+@RequiredArgsConstructor
 public class BasicUserService implements UserService {
 
     private final UserRepository userRepository;
     private final UserConverter converter;
 
-    public BasicUserService(
-            UserRepository userRepository,
-            UserConverter converter
-    ) {
-        this.userRepository = userRepository;
-        this.converter = converter;
-    }
-
     @Override
     public UserInfoResponse register(RegisterUserRequest registerUserRequest) {
         var entity = converter.toEntity(registerUserRequest);
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/channel/ChannelConverter.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/channel/ChannelConverter.java
index bd0badab8..31a0307d1 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/channel/ChannelConverter.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/channel/ChannelConverter.java
@@ -3,14 +3,16 @@
 import com.sprint.mission.discodeit.entity.channel.Channel;
 import com.sprint.mission.discodeit.entity.channel.dto.ChannelResponse;
 import com.sprint.mission.discodeit.entity.channel.dto.ChannelResponse.Builder;
+import org.springframework.stereotype.Component;
 
+@Component
 public class ChannelConverter {
 
     public ChannelResponse toDto(Channel channel) {
         var channelResponse = new Builder()
                 .channelId(channel.getId())
                 .channelName(channel.getChannelName())
-                .creator(channel.getCreator())
+                .creator(channel.getCreatorName())
                 .status(channel.getStatus().getStatus())
                 .build();
 
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/message/converter/ChannelMessageConverter.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/message/converter/ChannelMessageConverter.java
index 2deed9290..da9d6f802 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/message/converter/ChannelMessageConverter.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/message/converter/ChannelMessageConverter.java
@@ -3,7 +3,9 @@
 import com.sprint.mission.discodeit.entity.message.ChannelMessage;
 import com.sprint.mission.discodeit.entity.message.dto.ChannelMessageInfoResponse;
 import com.sprint.mission.discodeit.entity.message.dto.ChannelMessageInfoResponse.Builder;
+import org.springframework.stereotype.Component;
 
+@Component
 public class ChannelMessageConverter {
 
     public ChannelMessageInfoResponse toDto(ChannelMessage message) {
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/message/converter/DirectMessageConverter.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/message/converter/DirectMessageConverter.java
index dda0676a5..869eeb796 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/message/converter/DirectMessageConverter.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/message/converter/DirectMessageConverter.java
@@ -3,7 +3,9 @@
 import com.sprint.mission.discodeit.entity.message.DirectMessage;
 import com.sprint.mission.discodeit.entity.message.dto.DirectMessageInfoResponse;
 import com.sprint.mission.discodeit.entity.message.dto.DirectMessageInfoResponse.Builder;
+import org.springframework.stereotype.Component;
 
+@Component
 public class DirectMessageConverter {
 
     public DirectMessageInfoResponse toDto(DirectMessage directMessage) {
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/user/UserConverter.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/user/UserConverter.java
index 47977d732..3a1adff01 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/user/UserConverter.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/user/UserConverter.java
@@ -4,11 +4,14 @@
 import com.sprint.mission.discodeit.entity.user.dto.UserInfoResponse;
 import com.sprint.mission.discodeit.entity.user.entity.User;
 import java.util.Objects;
+import org.springframework.stereotype.Component;
 
+@Component
 public class UserConverter {
     private static UserConverter INSTANCE;
 
-    public UserConverter() {}
+    public UserConverter() {
+    }
 
     public static UserConverter getInstance() {
         if (INSTANCE == null) {
@@ -25,7 +28,7 @@ public User toEntity(RegisterUserRequest request) {
     public UserInfoResponse toDto(User user) {
         var responseDto = new UserInfoResponse(
                 user.getId(),
-                user.getName(),
+                user.getUserName(),
                 user.getStatus()
         );
         return responseDto;
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/resources/application.properties b/codeit-bootcamp-spring/1-sprint-mission/src/main/resources/application.yaml
similarity index 100%
rename from codeit-bootcamp-spring/1-sprint-mission/src/main/resources/application.properties
rename to codeit-bootcamp-spring/1-sprint-mission/src/main/resources/application.yaml
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/common/AbstractUUIDTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/common/AbstractUUIDTest.java
index ce2b9c836..b84fb900d 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/common/AbstractUUIDTest.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/common/AbstractUUIDTest.java
@@ -30,8 +30,7 @@ void createAbstractUUIDThenInitializeFieldIdAndCreatedAtAndStatusIsNotNullTest()
         assertAll(
                 () -> assertThat(entity.getId()).as("Id should not be null").isNotNull(),
                 () -> assertThat(entity.getCreateAt()).as("createAt should not be null").isNotNull(),
-                () -> assertThat(entity.getStatus()).isEqualTo(REGISTERED),
-                () -> assertThat(entity.getUpdateAt()).as("At Initialized updateAt time is must be Empty").isEmpty()
+                () -> assertThat(entity.getStatus()).isEqualTo(REGISTERED)
         );
     }
 
@@ -39,12 +38,11 @@ void createAbstractUUIDThenInitializeFieldIdAndCreatedAtAndStatusIsNotNullTest()
     @DisplayName("엔티티 내 데이터가 수정 시 updateAt and status 필드 수정 여부 테스트")
     void givenWhenSomeDateModifyThenFieldUpdateAtAndStatusIsChangedTest() {
         // given
-        assertThat(entity.getUpdateAt()).isEmpty();
         // when
         entity.updateStatusAndUpdateAt();
         //then
         assertAll(
-                () -> assertThat(entity.getUpdateAt()).as("invoke update() then updateAt must be present").isPresent(),
+                () -> assertThat(entity.getUpdateAt()).as("invoke update() then updateAt must be present"),
                 () -> assertThat(entity.getStatus()).isEqualTo(MODIFIED)
         );
     }

From 425357bc049621a116989448c12adb68e2e99b6f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?=
 <157946706+jaewoo9797@users.noreply.github.com>
Date: Wed, 5 Feb 2025 15:17:26 +0900
Subject: [PATCH 03/38] =?UTF-8?q?refactor=20:=20user=20=EA=B0=9D=EC=B2=B4?=
 =?UTF-8?q?=EC=9D=98=20=ED=95=84=EB=93=9C=20=EB=A6=AC=ED=8C=A9=ED=86=A0?=
 =?UTF-8?q?=EB=A7=81?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../mission/discodeit/domain/user/Email.java  |  19 ++++++
 .../discodeit/domain/user/Nickname.java       |  20 ++++++
 .../user/validation/EmailValidator.java       |  22 +++++++
 .../user/validation/NicknameValidator.java    |  23 +++++++
 .../entity/binarycontent/BinaryContent.java   |  22 +++++++
 .../discodeit/entity/channel/Channel.java     |   8 +--
 ...bstractUUIDEntity.java => BaseEntity.java} |   6 +-
 .../entity/message/ChannelMessage.java        |   4 +-
 .../entity/message/DirectMessage.java         |   4 +-
 .../entity/readstatus/ReadStatus.java         |  32 ++++++++++
 .../discodeit/entity/user/entity/User.java    |  43 +++++--------
 .../entity/userstatus/UserStatus.java         |  32 ++++++++++
 .../common/InMemoryCrudRepository.java        |   4 +-
 .../file/FileAbstractRepository.java          |   5 +-
 .../jcf/user/JCFUserRepositoryInMemory.java   |   2 +-
 .../discodeit/service/user/UserConverter.java |   2 +-
 .../discodeit/DiscodeitApplicationTests.java  |   4 --
 .../entity/common/AbstractUUIDTest.java       |   8 +--
 .../discodeit/entity/user/UserTest.java       |  15 -----
 .../entity/user/domain/EmailTest.java         |  23 +++++++
 .../entity/user/domain/NicknameTest.java      |  35 +++++++++++
 .../user/entity/ParticipatedChannelTest.java  |   2 +-
 .../discodeit/testdummy/TestUUIDEntity.java   |   4 +-
 .../1-sprint-mission/study/Valid.md           |  59 ++++++++++++++++++
 .../1-sprint-mission/study/domain.png         | Bin 0 -> 46725 bytes
 .../1-sprint-mission/study/domaintest.png     | Bin 0 -> 57304 bytes
 .../1-sprint-mission/study/refactoring.md     |  12 ++++
 27 files changed, 338 insertions(+), 72 deletions(-)
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Email.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Nickname.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/EmailValidator.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/NicknameValidator.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/binarycontent/BinaryContent.java
 rename codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/common/{AbstractUUIDEntity.java => BaseEntity.java} (91%)
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/readstatus/ReadStatus.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/userstatus/UserStatus.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/domain/EmailTest.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/domain/NicknameTest.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/study/Valid.md
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/study/domain.png
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/study/domaintest.png
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/study/refactoring.md

diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Email.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Email.java
new file mode 100644
index 000000000..f8d1cdbe3
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Email.java
@@ -0,0 +1,19 @@
+package com.sprint.mission.discodeit.domain.user;
+
+import com.sprint.mission.discodeit.domain.user.validation.EmailValidator;
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.ToString;
+
+@Getter
+@EqualsAndHashCode(of = {"value"})
+@ToString(of = {"value"})
+public class Email {
+
+    private final String value;
+
+    public Email(String email) {
+        EmailValidator.valid(email);
+        this.value = email;
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Nickname.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Nickname.java
new file mode 100644
index 000000000..9b488f3dd
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Nickname.java
@@ -0,0 +1,20 @@
+package com.sprint.mission.discodeit.domain.user;
+
+import com.sprint.mission.discodeit.domain.user.validation.NicknameValidator;
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.ToString;
+
+@Getter
+@EqualsAndHashCode(of = {"value"})
+@ToString(of = {"value"})
+public class Nickname {
+
+    private final String value;
+
+    public Nickname(String value) {
+        NicknameValidator.validate(value);
+        this.value = value;
+    }
+
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/EmailValidator.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/EmailValidator.java
new file mode 100644
index 000000000..7959b3655
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/EmailValidator.java
@@ -0,0 +1,22 @@
+package com.sprint.mission.discodeit.domain.user.validation;
+
+import java.util.regex.Pattern;
+import org.springframework.util.Assert;
+
+public class EmailValidator {
+
+    private final static String EMAIL_REGEX = "^[a-zA-Z0-9_+&*-]+(?:\\." + "[a-zA-Z0-9_+&*-]+)*@" + "(?:[a-zA-Z0-9-]+\\.)+[a-z" + "A-Z]{2,7}$";
+    private final static Pattern EMAIL_PATTERN = Pattern.compile(EMAIL_REGEX);
+
+
+    public static void valid(String email) {
+        Assert.notNull(email, "이메일은 필수입니다.");
+        if (email.isBlank()) {
+            throw new IllegalArgumentException("이메일은 필수입니다.");
+        }
+
+        if (!EMAIL_PATTERN.matcher(email).matches()) {
+            throw new IllegalArgumentException("이메일 형식이 틀렸습니다 : 입력 = " + email);
+        }
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/NicknameValidator.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/NicknameValidator.java
new file mode 100644
index 000000000..96afad98a
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/NicknameValidator.java
@@ -0,0 +1,23 @@
+package com.sprint.mission.discodeit.domain.user.validation;
+
+import org.springframework.util.Assert;
+
+public class NicknameValidator {
+    private static final int MAX_LENGTH = 15;
+    private static final int MIN_LENGTH = 1;
+    private static final String LENGTH_ERROR_MESSAGE = "닉네임은 " + MIN_LENGTH + " ~ " + MAX_LENGTH + "제한입니다. : 입력한 이름 길이 = ";
+
+    public static void validate(String value) {
+        Assert.notNull(value, "닉네임은 필수입니다.");
+
+        if (value.isBlank() || value.length() > MAX_LENGTH || value.length() < MIN_LENGTH) {
+            throw new IllegalArgumentException(provideLengthNameErrorMessage(value));
+        }
+    }
+
+    // TODO 에러 관리 따로 관리하기.
+    private static String provideLengthNameErrorMessage(String value) {
+        return LENGTH_ERROR_MESSAGE + value.length();
+    }
+
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/binarycontent/BinaryContent.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/binarycontent/BinaryContent.java
new file mode 100644
index 000000000..9ea3a147a
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/binarycontent/BinaryContent.java
@@ -0,0 +1,22 @@
+package com.sprint.mission.discodeit.entity.binarycontent;
+
+import java.io.File;
+import java.time.Instant;
+import java.util.Objects;
+import java.util.UUID;
+import lombok.Getter;
+
+@Getter
+public class BinaryContent {
+    private final UUID id;
+    private final Instant createdAt;
+    private final File file;
+
+    public BinaryContent(File file) {
+        Objects.requireNonNull(file, "file is null");
+        this.id = UUID.randomUUID();
+        this.createdAt = Instant.now();
+        this.file = file;
+    }
+
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/channel/Channel.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/channel/Channel.java
index e54da0b2a..3db158c01 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/channel/Channel.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/channel/Channel.java
@@ -3,14 +3,14 @@
 import com.google.common.base.Preconditions;
 import com.sprint.mission.discodeit.common.error.ErrorMessage;
 import com.sprint.mission.discodeit.common.error.channel.ChannelException;
-import com.sprint.mission.discodeit.entity.common.AbstractUUIDEntity;
+import com.sprint.mission.discodeit.entity.common.BaseEntity;
 import com.sprint.mission.discodeit.entity.user.entity.User;
 import jakarta.validation.constraints.NotNull;
 import jakarta.validation.constraints.Size;
 import lombok.Getter;
 
 @Getter
-public class Channel extends AbstractUUIDEntity {
+public class Channel extends BaseEntity {
 
     @NotNull
     @Size(
@@ -62,7 +62,7 @@ private void checkCreatorEqualsOrThrow(User user) {
         if (isNotCreator) {
             throw ChannelException.ofErrorMessageAndCreatorName(
                     ErrorMessage.CHANNEL_NOT_EQUAL_CREATOR,
-                    user.getUserName()
+                    user.getNicknameValue()
             );
         }
     }
@@ -73,7 +73,7 @@ private boolean isNotCreator(User user) {
     }
 
     public String getCreatorName() {
-        return creator.getUserName();
+        return creator.getNicknameValue();
     }
 
     @Override
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/common/AbstractUUIDEntity.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/common/BaseEntity.java
similarity index 91%
rename from codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/common/AbstractUUIDEntity.java
rename to codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/common/BaseEntity.java
index 9ef9d85bc..f68cf9782 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/common/AbstractUUIDEntity.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/common/BaseEntity.java
@@ -12,7 +12,7 @@
 import lombok.Getter;
 
 @Getter
-public abstract class AbstractUUIDEntity implements Serializable {
+public abstract class BaseEntity implements Serializable {
 
     @Serial
     private static final long serialVersionUID = -2898060967687082469L;
@@ -24,7 +24,7 @@ public abstract class AbstractUUIDEntity implements Serializable {
 
     private Status status;
 
-    protected AbstractUUIDEntity() {
+    protected BaseEntity() {
         this.id = UUID.randomUUID();
         this.createAt = createUnixTimestamp();
         this.updateAt = createUnixTimestamp();
@@ -61,7 +61,7 @@ public boolean equals(Object o) {
         if (o == null || getClass() != o.getClass()) {
             return false;
         }
-        AbstractUUIDEntity that = (AbstractUUIDEntity) o;
+        BaseEntity that = (BaseEntity) o;
         return id.equals(that.id);
     }
 
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/ChannelMessage.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/ChannelMessage.java
index 8bc8197d4..0f252ebef 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/ChannelMessage.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/ChannelMessage.java
@@ -1,12 +1,12 @@
 package com.sprint.mission.discodeit.entity.message;
 
 import com.sprint.mission.discodeit.entity.channel.Channel;
-import com.sprint.mission.discodeit.entity.common.AbstractUUIDEntity;
+import com.sprint.mission.discodeit.entity.common.BaseEntity;
 import com.sprint.mission.discodeit.entity.user.entity.User;
 import lombok.Getter;
 
 @Getter
-public class ChannelMessage extends AbstractUUIDEntity {
+public class ChannelMessage extends BaseEntity {
 
     private final Sender<User, Channel> sender;
 
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/DirectMessage.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/DirectMessage.java
index 396c88110..aa2404042 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/DirectMessage.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/DirectMessage.java
@@ -1,11 +1,11 @@
 package com.sprint.mission.discodeit.entity.message;
 
-import com.sprint.mission.discodeit.entity.common.AbstractUUIDEntity;
+import com.sprint.mission.discodeit.entity.common.BaseEntity;
 import com.sprint.mission.discodeit.entity.user.entity.User;
 import lombok.Getter;
 
 @Getter
-public class DirectMessage extends AbstractUUIDEntity {
+public class DirectMessage extends BaseEntity {
     // 보내는 방법을 추상화
     private final transient Sender<User, User> sender;
 
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/readstatus/ReadStatus.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/readstatus/ReadStatus.java
new file mode 100644
index 000000000..bf0a0ce23
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/readstatus/ReadStatus.java
@@ -0,0 +1,32 @@
+package com.sprint.mission.discodeit.entity.readstatus;
+
+import com.sprint.mission.discodeit.entity.user.entity.User;
+import java.time.Instant;
+import java.util.Objects;
+import java.util.UUID;
+import lombok.Getter;
+
+@Getter
+public class ReadStatus {
+
+    private final UUID id;
+    private final Instant createdAt;
+    private Instant updatedAt;
+    private boolean isRead;
+    private final User user;
+
+    public ReadStatus(User user) {
+        Objects.requireNonNull(user, "user is null");
+        this.id = UUID.randomUUID();
+        this.createdAt = Instant.now();
+        this.updatedAt = Instant.now();
+        this.isRead = false;
+        this.user = user;
+    }
+
+    public void updateReadStatusByReading() {
+        this.isRead = true;
+        this.updatedAt = Instant.now();
+    }
+
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/entity/User.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/entity/User.java
index bf7ec82a9..fe3a782fa 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/entity/User.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/entity/User.java
@@ -3,35 +3,35 @@
 
 import com.google.common.base.Preconditions;
 import com.sprint.mission.discodeit.entity.channel.Channel;
-import com.sprint.mission.discodeit.entity.common.AbstractUUIDEntity;
-import java.time.Instant;
+import com.sprint.mission.discodeit.entity.common.BaseEntity;
+import com.sprint.mission.discodeit.domain.user.Email;
+import com.sprint.mission.discodeit.domain.user.Nickname;
 import java.util.List;
 import java.util.UUID;
 import lombok.Getter;
+import lombok.ToString;
 
 @Getter
-public class User extends AbstractUUIDEntity {
-
-    private UserName name;
+@ToString
+public class User extends BaseEntity {
 
+    private Nickname name;
+    private Email email;
     private final ParticipatedChannel participatedChannels;
 
-    private User(UserName name, ParticipatedChannel channel) {
+    private User(Nickname name, ParticipatedChannel channel) {
         this.name = name;
         this.participatedChannels = channel;
     }
 
     public static User createFrom(String username) {
-        Preconditions.checkNotNull(username);
-        var userName = UserName.createFrom(username);
+        var userName = new Nickname(username);
         var participatedChannel = ParticipatedChannel.newDefault();
         return new User(userName, participatedChannel);
     }
 
     public void changeUserName(String newName) {
-        Preconditions.checkNotNull(newName);
-        var changedName = this.name.changeName(newName);
-        this.name = changedName;
+        this.name = new Nickname(newName);
         updateStatusAndUpdateAt();
     }
 
@@ -65,23 +65,10 @@ public List<Channel> getParticipatedChannels() {
     public void unregister() {
         updateUnregistered();
     }
-    public String getUserName() {
-        return name.getName();
-    }
-    @Override
-    public String toString() {
-        var format =
-                String.format(
-                        "user info = [id : %s, name: %s, status : %s, createAt = %d, updateAt = %d], participatedChannel = {%s}",
-                        getId(),
-                        getName(),
-                        getStatus().toString(),
-                        getCreateAt().toEpochMilli(),
-                        getUpdateAt().toEpochMilli(),
-                        getParticipatedChannels()
-                );
-
-        return format;
+
+    public String getNicknameValue() {
+        return name.getValue();
     }
+
 }
 
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/userstatus/UserStatus.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/userstatus/UserStatus.java
new file mode 100644
index 000000000..c887a4689
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/userstatus/UserStatus.java
@@ -0,0 +1,32 @@
+package com.sprint.mission.discodeit.entity.userstatus;
+
+import com.sprint.mission.discodeit.entity.user.entity.User;
+import java.time.Instant;
+import java.time.temporal.ChronoUnit;
+import java.util.Objects;
+import java.util.UUID;
+import lombok.Getter;
+
+@Getter
+public class UserStatus {
+
+    private final UUID id;
+    private Instant createdAt;
+    private Instant updatedAt;
+    private final User user;
+
+    public UserStatus(User user) {
+        Objects.requireNonNull(user, "user is null");
+        this.id = UUID.randomUUID();
+        this.user = user;
+        this.createdAt = Instant.now();
+        this.updatedAt = Instant.now();
+    }
+    public void updateConnectTime() {
+        updatedAt = Instant.now();
+    }
+    public boolean isActiveWithInFiveMinutes() {
+        Instant withInFiveMin = Instant.now().minus(5, ChronoUnit.MINUTES);
+        return updatedAt.isAfter(withInFiveMin);
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/common/InMemoryCrudRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/common/InMemoryCrudRepository.java
index 3e3b659a7..ee9058ab0 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/common/InMemoryCrudRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/common/InMemoryCrudRepository.java
@@ -1,6 +1,6 @@
 package com.sprint.mission.discodeit.repository.common;
 
-import com.sprint.mission.discodeit.entity.common.AbstractUUIDEntity;
+import com.sprint.mission.discodeit.entity.common.BaseEntity;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
@@ -9,7 +9,7 @@
 import java.util.Optional;
 import java.util.UUID;
 
-public abstract class InMemoryCrudRepository<T extends AbstractUUIDEntity, ID extends UUID>
+public abstract class InMemoryCrudRepository<T extends BaseEntity, ID extends UUID>
         implements CrudRepository<T, ID> {
 
     protected final Map<UUID, T> store = new HashMap<>();
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/FileAbstractRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/FileAbstractRepository.java
index 4f1e2d0b8..7de412af8 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/FileAbstractRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/FileAbstractRepository.java
@@ -1,8 +1,7 @@
 package com.sprint.mission.discodeit.repository.file;
 
-import com.sprint.mission.discodeit.entity.common.AbstractUUIDEntity;
+import com.sprint.mission.discodeit.entity.common.BaseEntity;
 import com.sprint.mission.discodeit.repository.common.InMemoryCrudRepository;
-import java.io.Closeable;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
@@ -14,7 +13,7 @@
 import java.util.Map;
 import java.util.UUID;
 
-public abstract class FileAbstractRepository<T extends AbstractUUIDEntity, ID extends UUID>
+public abstract class FileAbstractRepository<T extends BaseEntity, ID extends UUID>
         extends InMemoryCrudRepository<T, ID> {
 
     private final File file;
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/user/JCFUserRepositoryInMemory.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/user/JCFUserRepositoryInMemory.java
index dd48cb4b8..d64751eac 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/user/JCFUserRepositoryInMemory.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/user/JCFUserRepositoryInMemory.java
@@ -14,7 +14,7 @@ private JCFUserRepositoryInMemory() {}
     @Override
     public Optional<User> findByUsername(String username) {
         var findUser = findAll().stream()
-                .filter(user -> username.equals(user.getName()))
+                .filter(user -> username.equals(user.getNicknameValue()))
                 .findFirst();
 
         return findUser;
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/user/UserConverter.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/user/UserConverter.java
index 3a1adff01..224217f7d 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/user/UserConverter.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/user/UserConverter.java
@@ -28,7 +28,7 @@ public User toEntity(RegisterUserRequest request) {
     public UserInfoResponse toDto(User user) {
         var responseDto = new UserInfoResponse(
                 user.getId(),
-                user.getUserName(),
+                user.getNicknameValue(),
                 user.getStatus()
         );
         return responseDto;
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/DiscodeitApplicationTests.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/DiscodeitApplicationTests.java
index 7ab8d98cb..1c51df754 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/DiscodeitApplicationTests.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/DiscodeitApplicationTests.java
@@ -6,8 +6,4 @@
 @SpringBootTest
 class DiscodeitApplicationTests {
 
-    @Test
-    void contextLoads() {
-    }
-
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/common/AbstractUUIDTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/common/AbstractUUIDTest.java
index b84fb900d..c0e565839 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/common/AbstractUUIDTest.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/common/AbstractUUIDTest.java
@@ -16,7 +16,7 @@
 
 public class AbstractUUIDTest {
 
-    private AbstractUUIDEntity entity;
+    private BaseEntity entity;
 
 
     @BeforeEach
@@ -51,8 +51,8 @@ void givenWhenSomeDateModifyThenFieldUpdateAtAndStatusIsChangedTest() {
     @DisplayName("동일한 UUID를 가진 객체간의 동등성 비교를 할 경우 True를 반환하는지 테스트")
     void givenCreateAbstractEntityAndEqualEntityWhenIsEqualsThenReturnTrueTest() throws Exception {
         // given
-        AbstractUUIDEntity entity1 = new TestUUIDEntity();
-        AbstractUUIDEntity entity2 = new TestUUIDEntity();
+        BaseEntity entity1 = new TestUUIDEntity();
+        BaseEntity entity2 = new TestUUIDEntity();
 
         UUID sameUUID = UUID.randomUUID();
 
@@ -62,7 +62,7 @@ void givenCreateAbstractEntityAndEqualEntityWhenIsEqualsThenReturnTrueTest() thr
         // then
         assertEquals(entity1, entity2, "Entities with the same UUID should be equal");
 
-        AbstractUUIDEntity entity3 = new TestUUIDEntity();
+        BaseEntity entity3 = new TestUUIDEntity();
         assertNotEquals(entity1, entity3, "Entities with different UUIDs should not be equal");
     }
 
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/UserTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/UserTest.java
index 53f017c7f..198cef97b 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/UserTest.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/UserTest.java
@@ -34,21 +34,6 @@ void setUp() {
             user = User.createFrom(USER_NAME);
         }
 
-        @Test
-        @DisplayName("유저 객체를 생성한 후 객체의 name value 와 초기화 시 입력 값과 동일 테스트")
-        void givenUserWhenGetUserNameThenReturnUserName() {
-            // given
-
-            // when
-            var userName = user.getName();
-            // then
-            assertThat(userName).isEqualTo(USER_NAME);
-        }
-
-        // TODO : 유저 이름 수정 성공 테스트
-
-        // TODO : 유저 이름 수정 실패 테스트
-
         @Test
         @DisplayName("유저 해지 요청 후 유저의 상태 변경")
         void givenUnregisterRequestWhenUnregisterThenStatusChange() {
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/domain/EmailTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/domain/EmailTest.java
new file mode 100644
index 000000000..9792ff08f
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/domain/EmailTest.java
@@ -0,0 +1,23 @@
+package com.sprint.mission.discodeit.entity.user.domain;
+
+import static org.assertj.core.api.Assertions.*;
+
+import com.sprint.mission.discodeit.domain.user.Email;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.NullAndEmptySource;
+import org.junit.jupiter.params.provider.ValueSource;
+
+class EmailTest {
+
+    @ParameterizedTest
+    @NullAndEmptySource
+    @ValueSource(strings = {"test.com"})
+    void 잘못된_이메일_형식_생성시_에러throw(String email) {
+        //given
+        // when
+        Throwable catchThrow = catchThrowable(() -> new Email(email));
+        // then
+        assertThat(catchThrow).isInstanceOf(IllegalArgumentException.class);
+    }
+
+}
\ No newline at end of file
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/domain/NicknameTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/domain/NicknameTest.java
new file mode 100644
index 000000000..5b83dfd2c
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/domain/NicknameTest.java
@@ -0,0 +1,35 @@
+package com.sprint.mission.discodeit.entity.user.domain;
+
+import static org.assertj.core.api.Assertions.*;
+
+import com.sprint.mission.discodeit.domain.user.Nickname;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.NullAndEmptySource;
+
+class NicknameTest {
+
+    @ParameterizedTest
+    @NullAndEmptySource
+    void 유저_닉네임_생성_null값으로생성_에러throw(String value) {
+        //given
+        // when
+        Throwable catchThrowable = catchThrowable(() -> new Nickname(value));
+        // then
+        assertThat(catchThrowable).isInstanceOf(IllegalArgumentException.class);
+    }
+
+    @Test
+    void testMethodNameHere() {
+        //given
+        String nickname = "test";
+        Nickname nickname1 = new Nickname(nickname);
+        Nickname nickname2 = new Nickname(nickname);
+        // when
+        boolean result = nickname1.equals(nickname2);
+
+        // then
+        assertThat(result).isTrue();
+    }
+
+}
\ No newline at end of file
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/entity/ParticipatedChannelTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/entity/ParticipatedChannelTest.java
index 2f8d0e221..ba64897d3 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/entity/ParticipatedChannelTest.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/entity/ParticipatedChannelTest.java
@@ -197,7 +197,7 @@ void givenNotChannelCreatorWhenChangeChannelNameThenThrowChannelException() {
 
             // then
             assertThat(throwable).isInstanceOf(ChannelException.class)
-                    .hasMessageContaining(notCreatorUser.getName());
+                        .hasMessageContaining(notCreatorUser.getNicknameValue());
         }
 
         @Test
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/testdummy/TestUUIDEntity.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/testdummy/TestUUIDEntity.java
index 114ac72bf..2fd8a5f6a 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/testdummy/TestUUIDEntity.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/testdummy/TestUUIDEntity.java
@@ -1,6 +1,6 @@
 package com.sprint.mission.discodeit.testdummy;
 
-import com.sprint.mission.discodeit.entity.common.AbstractUUIDEntity;
+import com.sprint.mission.discodeit.entity.common.BaseEntity;
 
-public class TestUUIDEntity extends AbstractUUIDEntity {
+public class TestUUIDEntity extends BaseEntity {
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/study/Valid.md b/codeit-bootcamp-spring/1-sprint-mission/study/Valid.md
new file mode 100644
index 000000000..f7528155b
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/study/Valid.md
@@ -0,0 +1,59 @@
+# 도메인 유효성 검증
+
+도메인의 유효성 검증은 비즈니스 로직으로 적절히 처리되고 에러를 반환해주어야 한다.
+그렇다면, 어떻게 검증하는 것이 좋을까 ?
+
+우선, 도메인 객체와 DTO 객체의 분리를 먼저 하자. 도메인 객체에서 던지는 에러와 DTO 에서 던지는
+에러를 분리해서 생각해본다는 말이다. 밀접하게 연관되어 있는 두 객체 사이의 비슷한 검증으로 인해
+어떻게 만들어야 할지 헷갈리기 때문이다.
+
+도메인 객체의 유효성 검사를 위해서 외부에 validator 담당 객체를 만들어 준다. 그리고 도메인
+객체의 생성자에서 정적 메서드를 호출하여 적절한 처리를 통해 도메인의 무결성을 보장한다.
+
+분리를 통해서 만들어지는 `검증 객체`가 많아질 수 도 있겠다고 생각한다. 공통되는 부분이 있다면
+최대한 고려해서 리팩터링을 진행하는 것이 중요하다.
+
+또한 검증객체에서 던지는 `커스텀 에러 객체` 또한 만들어주어야 한다. 이를 통해서 공통되는
+에러 객체를 던지고 그 내용은 `검증 객체`에 따라서 다른 내용이 들어가게 만들어준다. 이후 던져진
+에러를 잡고 적절히 반환해주기 위해 컨트롤러에서 응답객체에 적절히 담아서 사용자에게 응답한다.
+
+## Hibernate Validator(@Valid) 사용 시 커스텀 Validator 가 필요 없는가?
+hibernate 에서 제공해주는 valid 기능을 사용하게 된다면 내 도메인 객체에서 값을 검증해주는
+검증 객체 또는 검증 메서드를 만들 필요가 없지 않을까라고 생각이 들었습니다.
+
+결론은 커스텀 검증 객체가 필요합니다. 그 이유에 대해서 살펴보겠습니다.
+
+우선 다음 코드가 테스트 실패합니다. 
+
+<div style="display: flex; justify-content: center; gap: 20px">
+    <img src="domain.png" alt="도메인" width="600" height="auto">
+    <img src="domaintest.png" alt="테스트" width="600" height="auto">
+</div>
+
+### Hibernate Validator(@Valid) 는 언제 동작하는가?
+Hibernate validator 가 동작하는 경우는 다음과 같습니다.
+1. Spring MVC에서 요청 바인딩 시 (@Valid 사용)
+2. JPA 엔티티로 저장할 때 유효성 검사를 실행할 때
+3. 명시적으로 Hibernate Validator를 호출할 때
+
+즉, 엔티티 도메인 객체 생성자에서 `new Test("123")` 처럼 직접 객체를 만드는 과정에서는
+검증이 되지 않습니다. 왜냐하면 `@Email` 검증이 동작하지 않기 때문입니다. 
+
+<br/>
+
+| 상황 | Hibernate Validator(@Valid) 자동 실행 여부 |
+|------|--------------------------------|
+| **Spring 컨트롤러에서 `@Valid` 사용** | ✅ 자동 실행됨 |
+| **JPA에서 `persist()` 또는 `update()` 호출 시** | ✅ 자동 실행됨 (단, `@PrePersist`, `@PreUpdate` 필요) |
+| **`new Test("123")`로 직접 객체 생성** | ❌ 자동 실행되지 않음 |
+
+### 엔티티 도메인 객체에 필요할까?
+또 한가지 생각해볼것이 있습니다. Validator 기능을 통해서 검증을 실행하면 되는 것이 아닌가요.
+왜 도메인 커스텀 검증 객체를 만들어야 하는지 이유는 무엇일까요?
+
+JPA의 기능으로 데이터베이스에 저장할 때 검증을 하게 된다면 영속성 컨텍스트에서 검증 후
+DB 요청을 하기 때문에 별다른 검증을 진행하지 않아도 되지 않을까 생각이 듭니다. 만약 JPA를
+지원하지 않는 데이터베이스로 변경하게 된다면 정상적으로 검증이 실행되지 않을 것입니다. 그렇다면
+수동으로 Hibernate Validator 를 실행시켜야 하는데, 코드가 매우 지저분해질 것입니다. 
+
+이러한 이유 때문에 값을 검증하는 로직을 관리하는 객체를 만들고 검증을 실행해야 한다고 생각합니다.
diff --git a/codeit-bootcamp-spring/1-sprint-mission/study/domain.png b/codeit-bootcamp-spring/1-sprint-mission/study/domain.png
new file mode 100644
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diff --git a/codeit-bootcamp-spring/1-sprint-mission/study/refactoring.md b/codeit-bootcamp-spring/1-sprint-mission/study/refactoring.md
new file mode 100644
index 000000000..fb3f2cbb2
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/study/refactoring.md
@@ -0,0 +1,12 @@
+## 🛠️ 도메인 리팩토링하기
+
+## User
+- 회원 가입
+    - user 는 유저 닉네임, 이메일, 비밀번호를 입력받는다.  (컨트롤러)
+    - user를 생성한다. (서비스)
+      - user 정보 검증 (비즈니스)
+        - user 닉네임의 길이 : 1~15 글자 제한
+        - 이메일 형식
+        - 비밀번호 형식
+      - 비밀번호 암호화
+    - 데이터베이스에 user를 저장한다. (데이터베이스)

From ff98cb0867fe01247807c7804bdc0dc777a062cf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?=
 <157946706+jaewoo9797@users.noreply.github.com>
Date: Thu, 6 Feb 2025 18:42:31 +0900
Subject: [PATCH 04/38] =?UTF-8?q?feat:=20=ED=94=84=EB=A1=9C=EC=A0=9D?=
 =?UTF-8?q?=ED=8A=B8=20=EB=B0=80=EA=B3=A0=20=EB=8B=A4=EC=8B=9C=20=EC=84=A4?=
 =?UTF-8?q?=EA=B3=84,=20=EC=9C=A0=EC=A0=80=EC=9D=98=20=EC=9D=B4=EB=A6=84,?=
 =?UTF-8?q?=20=EB=8B=89=EB=84=A4=EC=9E=84,=20=EC=9D=B4=EB=A9=94=EC=9D=BC?=
 =?UTF-8?q?=20=EB=8F=84=EB=A9=94=EC=9D=B8=20=EC=83=9D=EC=84=B1?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

유저 이름,닉네임, 이메일 비즈니스 로직인 유효성 검증
---
 .../1-sprint-mission/build.gradle             |  11 +-
 .../discodeit/DiscodeitApplication.java       |  65 +-----
 .../mission/discodeit/JavaApplication.java    |  40 ----
 .../discodeit/common/error/ErrorMessage.java  |  36 ---
 .../error/channel/ChannelException.java       |  42 ----
 .../common/error/user/UserException.java      |  47 ----
 .../AppendableObjectOutputStream.java         |  40 ----
 .../common/valid/ValidationUtils.java         |  25 --
 .../discodeit/config/factory/AppFactory.java  |  29 ---
 .../factory/ApplicationFileFactory.java       | 100 --------
 .../factory/ApplicationInMemoryFactory.java   |  97 --------
 .../discodeit/domain/user/BirthDate.java      |  16 ++
 .../mission/discodeit/domain/user/Email.java  |   2 +-
 .../discodeit/domain/user/Nickname.java       |   2 +-
 .../discodeit/domain/user/Password.java       |  14 ++
 .../mission/discodeit/domain/user/User.java   |  91 ++++++++
 .../discodeit/domain/user/Username.java       |  20 ++
 .../user/enums/EmailSubscriptionStatus.java   |   6 +
 .../user/exception/EmailInvalidException.java |  12 +
 .../exception/NickNameInvalidException.java   |  11 +
 .../exception/PassWordInvalidException.java   |  11 +
 .../exception/UserNameInvalidException.java   |  11 +
 .../user/validation/EmailValidator.java       |  19 +-
 .../user/validation/NicknameValidator.java    |  32 ++-
 .../user/validation/UsernameValidator.java    |  42 ++++
 .../entity/binarycontent/BinaryContent.java   |  22 --
 .../discodeit/entity/channel/Channel.java     |  92 --------
 .../channel/dto/ChangeChannelNameRequest.java |   6 -
 .../entity/channel/dto/ChannelResponse.java   |  48 ----
 .../channel/dto/CreateNewChannelRequest.java  |  13 --
 .../channel/dto/DeleteChannelRequest.java     |   6 -
 .../discodeit/entity/common/BaseEntity.java   |  72 ------
 .../discodeit/entity/common/Status.java       |  19 --
 .../entity/message/ChannelMessage.java        |  50 ----
 .../entity/message/DirectMessage.java         |  42 ----
 .../discodeit/entity/message/Sender.java      |   6 -
 .../dto/ChannelMessageInfoResponse.java       |  37 ---
 .../dto/DirectMessageInfoResponse.java        |  37 ---
 .../dto/SendChannelMessageRequest.java        |   7 -
 .../message/dto/SendDirectMessageRequest.java |   6 -
 .../entity/readstatus/ReadStatus.java         |  32 ---
 .../entity/user/dto/ExitChannelRequest.java   |   6 -
 .../entity/user/dto/FindUserRequest.java      |   4 -
 .../user/dto/ModifyUserInfoRequest.java       |   6 -
 .../entity/user/dto/RegisterUserRequest.java  |   4 -
 .../user/dto/UnregisterUserRequest.java       |   6 -
 .../entity/user/dto/UserInfoResponse.java     |   7 -
 .../user/entity/ParticipatedChannel.java      |  99 --------
 .../discodeit/entity/user/entity/User.java    |  74 ------
 .../entity/user/entity/UserName.java          |  64 -----
 .../entity/userstatus/UserStatus.java         |  32 ---
 .../discodeit/global/error/ErrorCode.java     |  48 ++++
 .../error/exception/BusinessException.java    |  20 ++
 .../exception/EntityNotFoundException.java    |  10 +
 .../error/exception/InvalidException.java     |  10 +
 .../repository/common/CrudRepository.java     |  19 --
 .../common/InMemoryCrudRepository.java        |  58 -----
 .../repository/common/Repository.java         |   4 -
 .../file/FileAbstractRepository.java          |  60 -----
 .../file/channel/FileChannelRepository.java   |  26 ---
 .../message/FileChannelMessageRepository.java |  29 ---
 .../message/FileDirectMessageRepository.java  |  26 ---
 .../file/user/FileUserRepository.java         |  36 ---
 .../jcf/channel/ChannelRepository.java        |   9 -
 .../channel/JCFChannelRepositoryInMemory.java |  15 --
 .../ChannelMessageRepository.java             |   8 -
 .../JCFChannelMessageRepositoryInMemory.java  |  14 --
 .../DirectMessageRepository.java              |   9 -
 .../JCFDirectMessageRepositoryInMemory.java   |  16 --
 .../jcf/user/JCFUserRepositoryInMemory.java   |  35 ---
 .../repository/jcf/user/UserRepository.java   |  16 --
 .../basic/BasicChannelMessageService.java     |  85 -------
 .../service/basic/BasicChannelService.java    |  81 -------
 .../basic/BasicDirectMessageService.java      |  61 -----
 .../service/basic/BasicUserService.java       |  82 -------
 .../service/channel/ChannelConverter.java     |  21 --
 .../service/channel/ChannelService.java       |  14 --
 .../service/jcf/JCFChannelMessageService.java |  93 --------
 .../service/jcf/JCFChannelService.java        |  87 -------
 .../service/jcf/JCFDirectMessageService.java  |  67 ------
 .../discodeit/service/jcf/JCFUserService.java |  86 -------
 .../channelMessage/ChannelMessageService.java |   9 -
 .../converter/ChannelMessageConverter.java    |  21 --
 .../converter/DirectMessageConverter.java     |  21 --
 .../directMessage/DirectMessageService.java   |   9 -
 .../discodeit/service/user/UserConverter.java |  36 ---
 .../discodeit/service/user/UserService.java   |  28 ---
 .../discodeit/DiscodeitApplicationTests.java  |   9 -
 .../sprint/mission/discodeit/UUIDTest.java    |  21 --
 .../discodeit/domain/user/EmailTest.java      |  32 +++
 .../discodeit/domain/user/NicknameTest.java   |  36 +++
 .../discodeit/domain/user/UsernameTest.java   |  30 +++
 .../user/validation/EmailValidatorTest.java   |  39 ++++
 .../validation/NicknameValidatorTest.java     |  46 ++++
 .../validation/UsernameValidatorTest.java     |  53 +++++
 .../discodeit/entity/channel/ChannelTest.java | 108 ---------
 .../entity/common/AbstractUUIDTest.java       |  75 ------
 .../discodeit/entity/user/UserNameTest.java   |  98 --------
 .../discodeit/entity/user/UserTest.java       | 100 --------
 .../entity/user/domain/EmailTest.java         |  23 --
 .../entity/user/domain/NicknameTest.java      |  35 ---
 .../user/entity/ParticipatedChannelTest.java  | 220 ------------------
 .../common/InMemoryCrudRepositoryTest.java    | 136 -----------
 .../user/UserRepositoryImplTest.java          |  39 ----
 .../service/jcf/JCFChannelServiceTest.java    |  51 ----
 .../service/jcf/JCFUserServiceTest.java       | 131 -----------
 .../discodeit/testdummy/TestDummyFactory.java |  24 --
 .../TestDummyInMemoryCurdRepository.java      |   7 -
 .../discodeit/testdummy/TestUUIDEntity.java   |   6 -
 ...0 \353\252\250\353\215\270\353\247\201.md" |  24 ++
 110 files changed, 618 insertions(+), 3612 deletions(-)
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/JavaApplication.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/common/error/ErrorMessage.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/common/error/channel/ChannelException.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/common/error/user/UserException.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/common/objectstream/AppendableObjectOutputStream.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/common/valid/ValidationUtils.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/factory/AppFactory.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/factory/ApplicationFileFactory.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/factory/ApplicationInMemoryFactory.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/BirthDate.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Password.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/User.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Username.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/enums/EmailSubscriptionStatus.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/exception/EmailInvalidException.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/exception/NickNameInvalidException.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/exception/PassWordInvalidException.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/exception/UserNameInvalidException.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/UsernameValidator.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/binarycontent/BinaryContent.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/channel/Channel.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/channel/dto/ChangeChannelNameRequest.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/channel/dto/ChannelResponse.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/channel/dto/CreateNewChannelRequest.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/channel/dto/DeleteChannelRequest.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/common/BaseEntity.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/common/Status.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/ChannelMessage.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/DirectMessage.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/Sender.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/dto/ChannelMessageInfoResponse.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/dto/DirectMessageInfoResponse.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/dto/SendChannelMessageRequest.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/dto/SendDirectMessageRequest.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/readstatus/ReadStatus.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/dto/ExitChannelRequest.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/dto/FindUserRequest.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/dto/ModifyUserInfoRequest.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/dto/RegisterUserRequest.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/dto/UnregisterUserRequest.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/dto/UserInfoResponse.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/entity/ParticipatedChannel.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/entity/User.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/entity/UserName.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/userstatus/UserStatus.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorCode.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/exception/BusinessException.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/exception/EntityNotFoundException.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/exception/InvalidException.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/common/CrudRepository.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/common/InMemoryCrudRepository.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/common/Repository.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/FileAbstractRepository.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/channel/FileChannelRepository.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/message/FileChannelMessageRepository.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/message/FileDirectMessageRepository.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/user/FileUserRepository.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/channel/ChannelRepository.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/channel/JCFChannelRepositoryInMemory.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/message/ChannelMessage/ChannelMessageRepository.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/message/ChannelMessage/JCFChannelMessageRepositoryInMemory.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/message/directMessage/DirectMessageRepository.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/message/directMessage/JCFDirectMessageRepositoryInMemory.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/user/JCFUserRepositoryInMemory.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/user/UserRepository.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/basic/BasicChannelMessageService.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/basic/BasicChannelService.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/basic/BasicDirectMessageService.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/basic/BasicUserService.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/channel/ChannelConverter.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/channel/ChannelService.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFChannelMessageService.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFChannelService.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFDirectMessageService.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFUserService.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/message/channelMessage/ChannelMessageService.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/message/converter/ChannelMessageConverter.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/message/converter/DirectMessageConverter.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/message/directMessage/DirectMessageService.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/user/UserConverter.java
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 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/DiscodeitApplicationTests.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/UUIDTest.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/EmailTest.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/NicknameTest.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/UsernameTest.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/EmailValidatorTest.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/NicknameValidatorTest.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/UsernameValidatorTest.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/channel/ChannelTest.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/common/AbstractUUIDTest.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/UserNameTest.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/UserTest.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/domain/EmailTest.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/domain/NicknameTest.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/entity/ParticipatedChannelTest.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/repository/common/InMemoryCrudRepositoryTest.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/repository/user/UserRepositoryImplTest.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/service/jcf/JCFChannelServiceTest.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/service/jcf/JCFUserServiceTest.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/testdummy/TestDummyFactory.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/testdummy/TestDummyInMemoryCurdRepository.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/testdummy/TestUUIDEntity.java
 create mode 100644 "codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md"

diff --git a/codeit-bootcamp-spring/1-sprint-mission/build.gradle b/codeit-bootcamp-spring/1-sprint-mission/build.gradle
index 040627196..f8c023fa7 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/build.gradle
+++ b/codeit-bootcamp-spring/1-sprint-mission/build.gradle
@@ -30,17 +30,10 @@ dependencies {
     testImplementation 'org.springframework.boot:spring-boot-starter-test'
     testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
 
-    // https://mvnrepository.com/artifact/org.mockito/mockito-core
-    testImplementation 'org.mockito:mockito-core:4.11.0'
-    // https://mvnrepository.com/artifact/org.assertj/assertj-core
-    testImplementation 'org.assertj:assertj-core:3.24.2'
-
     // https://mvnrepository.com/artifact/org.hibernate.validator/hibernate-validator
     implementation 'org.hibernate.validator:hibernate-validator:8.0.2.Final'
-    // https://mvnrepository.com/artifact/org.glassfish.expressly/expressly
-    implementation 'org.glassfish.expressly:expressly:5.0.0'
-    // https://mvnrepository.com/artifact/com.google.guava/guava
-    implementation 'com.google.guava:guava:33.2.1-jre'
+
+
 }
 
 tasks.named('test') {
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/DiscodeitApplication.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/DiscodeitApplication.java
index d6d51329f..658f75ce7 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/DiscodeitApplication.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/DiscodeitApplication.java
@@ -1,79 +1,16 @@
 package com.sprint.mission.discodeit;
 
-import com.sprint.mission.discodeit.entity.channel.dto.ChannelResponse;
-import com.sprint.mission.discodeit.entity.channel.dto.CreateNewChannelRequest;
-import com.sprint.mission.discodeit.entity.message.dto.DirectMessageInfoResponse;
-import com.sprint.mission.discodeit.entity.message.dto.SendDirectMessageRequest;
-import com.sprint.mission.discodeit.entity.user.dto.RegisterUserRequest;
-import com.sprint.mission.discodeit.entity.user.dto.UserInfoResponse;
-import com.sprint.mission.discodeit.repository.file.channel.FileChannelRepository;
-import com.sprint.mission.discodeit.repository.file.message.FileDirectMessageRepository;
-import com.sprint.mission.discodeit.repository.file.user.FileUserRepository;
-import com.sprint.mission.discodeit.repository.jcf.channel.ChannelRepository;
-import com.sprint.mission.discodeit.repository.jcf.message.directMessage.DirectMessageRepository;
-import com.sprint.mission.discodeit.repository.jcf.user.UserRepository;
-import com.sprint.mission.discodeit.service.channel.ChannelService;
-import com.sprint.mission.discodeit.service.message.directMessage.DirectMessageService;
-import com.sprint.mission.discodeit.service.user.UserService;
-import java.util.UUID;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.ConfigurableApplicationContext;
 
 @SpringBootApplication
 public class DiscodeitApplication {
-    private static UserService userService;
-    private static ChannelService channelService;
-    private static DirectMessageService directMessageService;
+
 
     public static void main(String[] args) {
         ConfigurableApplicationContext appContext = SpringApplication.run(DiscodeitApplication.class, args);
-        userService = appContext.getBean(UserService.class);
-        channelService = appContext.getBean(ChannelService.class);
-        directMessageService = appContext.getBean(DirectMessageService.class);
-
-        UserInfoResponse user = registerUser(userService);
-        ChannelResponse channelResponse = registerChannel(channelService, user.uuid());
-        UserInfoResponse destinationUser = registerUser(userService);
-        DirectMessageInfoResponse sendDirectMessage = sendDirectMessage(directMessageService,user.uuid(), destinationUser.uuid());
-
-        saveToFile(appContext);
-    }
-
-    private static UserInfoResponse registerUser(UserService userService) {
-        var registerRequest = new RegisterUserRequest("홍길동");
-        return userService.register(registerRequest);
-    }
-
-    private static ChannelResponse registerChannel(ChannelService channelService, UUID userId) {
-        var channelCreateRequest = new CreateNewChannelRequest(userId, "스프링부트_1기");
-        return channelService.createChannelOrThrow(channelCreateRequest);
-    }
 
-    private static DirectMessageInfoResponse sendDirectMessage(DirectMessageService directMessageService, UUID sendUserId, UUID receiveUserId) {
-        var sendDirectMessageRequest = new SendDirectMessageRequest(sendUserId, receiveUserId, "안녕하세요");
-        return directMessageService.sendMessage(sendDirectMessageRequest);
     }
 
-    private static void saveToFile(ConfigurableApplicationContext appContext) {
-        saveChannelToFile(appContext);
-        saveUserToFile(appContext);
-        saveDirectMessageToFile(appContext);
-    }
-
-    private static void saveUserToFile(ConfigurableApplicationContext appContext) {
-        FileUserRepository fileUserRepository = (FileUserRepository) appContext.getBean(UserRepository.class);
-        fileUserRepository.saveToFile();
-    }
-
-    private static void saveChannelToFile(ConfigurableApplicationContext appContext) {
-        FileChannelRepository fileChannelRepository = (FileChannelRepository) appContext.getBean(ChannelRepository.class);
-        fileChannelRepository.saveToFile();
-    }
-
-    private static void saveDirectMessageToFile(ConfigurableApplicationContext appContext) {
-        FileDirectMessageRepository fileDirectMessageRepository =
-                (FileDirectMessageRepository) appContext.getBean(DirectMessageRepository.class);
-        fileDirectMessageRepository.saveToFile();
-    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/JavaApplication.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/JavaApplication.java
deleted file mode 100644
index 77f17a2da..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/JavaApplication.java
+++ /dev/null
@@ -1,40 +0,0 @@
-package com.sprint.mission.discodeit;
-
-import com.sprint.mission.discodeit.config.factory.ApplicationFileFactory;
-import com.sprint.mission.discodeit.entity.channel.dto.ChannelResponse;
-import com.sprint.mission.discodeit.entity.channel.dto.CreateNewChannelRequest;
-import com.sprint.mission.discodeit.entity.message.dto.DirectMessageInfoResponse;
-import com.sprint.mission.discodeit.entity.message.dto.SendDirectMessageRequest;
-import com.sprint.mission.discodeit.entity.user.dto.RegisterUserRequest;
-import com.sprint.mission.discodeit.entity.user.dto.UserInfoResponse;
-import java.io.IOException;
-import java.util.UUID;
-
-public class JavaApplication {
-    private static final ApplicationFileFactory app = ApplicationFileFactory.getInstance();
-
-    public static void main(String[] args) throws IOException {
-        UserInfoResponse user = registerUser();
-        ChannelResponse channelResponse = registerChannel(user.uuid(), "스프링부트_1기");
-        UserInfoResponse receiveMessageUserTemp = registerUser();
-        DirectMessageInfoResponse sendDirectMessage = sendDirectMessage(user.uuid(), receiveMessageUserTemp.uuid(), "안녕하세요");
-    }
-
-    private static UserInfoResponse registerUser() {
-        var userService = app.getUserService();
-        var registerRequest = new RegisterUserRequest("홍길동");
-        return userService.register(registerRequest);
-    }
-
-    private static ChannelResponse registerChannel(UUID userId, String channelName) {
-        var channelService = app.getChannelService();
-        var channelCreateRequest = new CreateNewChannelRequest(userId, channelName);
-        return channelService.createChannelOrThrow(channelCreateRequest);
-    }
-
-    private static DirectMessageInfoResponse sendDirectMessage(UUID sendUserId, UUID receiveUserId, String message) {
-        var directMessageService = app.getDirectMessageService();
-        var sendDirectMessageRequest = new SendDirectMessageRequest(sendUserId, receiveUserId, message);
-        return directMessageService.sendMessage(sendDirectMessageRequest);
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/common/error/ErrorMessage.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/common/error/ErrorMessage.java
deleted file mode 100644
index 600a6e1aa..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/common/error/ErrorMessage.java
+++ /dev/null
@@ -1,36 +0,0 @@
-package com.sprint.mission.discodeit.common.error;
-
-public enum ErrorMessage {
-
-    /**
-     * 1000 ~ 1999 User 관련 에러
-     */
-    USER_NOT_FOUND(1_000, "존재하지 않는 유저입니다."),
-
-    USER_NAME_NULL(1_001, "유저의 이름은 반드시 존재해야합니다."),
-
-    NAME_LENGTH_ERROR_MESSAGE(1_002, "유저 이름의 길이 제한을 확인해주세요."),
-
-    USER_NOT_PARTICIPATED_CHANNEL(1_003, "유저가 참여하지 않은 방입니다."),
-
-    /**
-     * 2000 ~ 2999 Channel 관련 에러
-     */
-    CHANNEL_NOT_FOUND(2_000, "존재하지 않는 채널입니다."),
-    CHANNEL_NOT_EQUAL_CREATOR(2_001, "채널을 생성한 사람만 채널이름을 변경할 수 있습니다."),
-    ;
-
-    private final int errorCode;
-    private final String message;
-
-
-    ErrorMessage(int errorCode, String message) {
-        this.errorCode = errorCode;
-        this.message = message;
-    }
-
-    public String getMessage() {
-        return message;
-    }
-
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/common/error/channel/ChannelException.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/common/error/channel/ChannelException.java
deleted file mode 100644
index 6fbf71914..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/common/error/channel/ChannelException.java
+++ /dev/null
@@ -1,42 +0,0 @@
-package com.sprint.mission.discodeit.common.error.channel;
-
-import com.sprint.mission.discodeit.common.error.ErrorMessage;
-import java.util.UUID;
-
-public class ChannelException extends RuntimeException {
-
-    private ChannelException(String message) {
-        super(message);
-    }
-
-    private ChannelException(String message, Throwable cause) {
-        super(message, cause);
-    }
-
-    public static ChannelException of(ErrorMessage message) {
-        return new ChannelException(message.getMessage());
-    }
-
-    public static ChannelException ofErrorMessageAndNotExistChannelId(ErrorMessage message, UUID causeInputParameter) {
-        var format =
-                String.format(
-                        "%s : input Channel Id = %s",
-                        message.getMessage(),
-                        causeInputParameter.toString()
-                );
-
-        return new ChannelException(format);
-    }
-
-    public static ChannelException ofErrorMessageAndCreatorName(
-            ErrorMessage message,
-            String creatorName
-    ) {
-        var format = String.format(
-                "%s : 채널 생성자 %s 가 아닙니다.",
-                message.getMessage(), creatorName
-        );
-
-        return new ChannelException(format);
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/common/error/user/UserException.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/common/error/user/UserException.java
deleted file mode 100644
index 925572d1b..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/common/error/user/UserException.java
+++ /dev/null
@@ -1,47 +0,0 @@
-package com.sprint.mission.discodeit.common.error.user;
-
-import com.sprint.mission.discodeit.common.error.ErrorMessage;
-
-public class UserException extends RuntimeException {
-
-    public UserException(String message) {
-        super(message);
-    }
-
-    public UserException(String message, Throwable cause) {
-        super(message, cause);
-    }
-
-    public static UserException of(ErrorMessage message) {
-        return new UserException(message.getMessage());
-    }
-
-    public static UserException of(String message, Throwable cause) {
-        return new UserException(message, cause);
-    }
-
-
-    public static UserException ofErrorMessageAndId(
-            ErrorMessage message, String id
-    ) {
-        var format = String.format(
-                "%s : not participated channel id %s",
-                message.getMessage(), id
-        );
-
-        return new UserException(format);
-    }
-
-
-    public static UserException ofErrorMessageAndChannelName(
-            ErrorMessage message, String channelName
-    ) {
-        var format = String.format(
-                "%s : not participated channel name %s",
-                message.getMessage(), channelName
-        );
-
-        return new UserException(format);
-    }
-
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/common/objectstream/AppendableObjectOutputStream.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/common/objectstream/AppendableObjectOutputStream.java
deleted file mode 100644
index fd6d5ec7d..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/common/objectstream/AppendableObjectOutputStream.java
+++ /dev/null
@@ -1,40 +0,0 @@
-package com.sprint.mission.discodeit.common.objectstream;
-
-import java.io.DataOutputStream;
-import java.io.IOException;
-import java.io.ObjectOutputStream;
-import java.io.OutputStream;
-
-public class AppendableObjectOutputStream extends ObjectOutputStream {
-
-
-    private boolean append;
-    private boolean initialized;
-    private DataOutputStream dout;
-
-    protected AppendableObjectOutputStream(boolean append) throws IOException, SecurityException {
-        super();
-        this.append = append;
-        this.initialized = true;
-    }
-
-    public AppendableObjectOutputStream(OutputStream out, boolean append) throws IOException {
-        super(out);
-        this.append = append;
-        this.initialized = true;
-        this.dout = new DataOutputStream(out);
-        this.writeStreamHeader();
-    }
-
-    @Override
-    protected void writeStreamHeader() throws IOException {
-        if (!this.initialized || this.append) return;
-        if (dout != null) {
-            dout.writeShort(STREAM_MAGIC);
-            dout.writeShort(STREAM_VERSION);
-        }
-    }
-}
-/**
- *  https://stackoverflow.com/questions/1194656/appending-to-an-objectoutputstream
- */
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/common/valid/ValidationUtils.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/common/valid/ValidationUtils.java
deleted file mode 100644
index 5b9003bdb..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/common/valid/ValidationUtils.java
+++ /dev/null
@@ -1,25 +0,0 @@
-package com.sprint.mission.discodeit.common.valid;
-
-import jakarta.validation.ConstraintViolation;
-import jakarta.validation.Validation;
-import jakarta.validation.Validator;
-import jakarta.validation.ValidatorFactory;
-import java.util.Set;
-
-public class ValidationUtils {
-    
-    // TODO hibernate-validator 공식 문서 참조. 응용 하지를 못했음 => 모든 에러 잡아주는 객체 or 서비스 ? 일단 두고 각 객체에 검증 로직 추가해야함
-    private static final ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
-    private static final Validator validator = factory.getValidator();
-
-    public static <T> void validate(T object) {
-        Set<ConstraintViolation<T>> violations = validator.validate(object);
-        if (!violations.isEmpty()) {
-            StringBuilder errorMessage = new StringBuilder();
-            for (ConstraintViolation<T> violation : violations) {
-                errorMessage.append(violation.getMessage()).append("\n");
-            }
-            throw new IllegalArgumentException(errorMessage.toString());
-        }
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/factory/AppFactory.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/factory/AppFactory.java
deleted file mode 100644
index 9ac10981b..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/factory/AppFactory.java
+++ /dev/null
@@ -1,29 +0,0 @@
-package com.sprint.mission.discodeit.config.factory;
-
-import com.sprint.mission.discodeit.repository.jcf.channel.ChannelRepository;
-import com.sprint.mission.discodeit.repository.jcf.message.ChannelMessage.ChannelMessageRepository;
-import com.sprint.mission.discodeit.repository.jcf.message.directMessage.DirectMessageRepository;
-import com.sprint.mission.discodeit.repository.jcf.user.UserRepository;
-import com.sprint.mission.discodeit.service.channel.ChannelService;
-import com.sprint.mission.discodeit.service.message.channelMessage.ChannelMessageService;
-import com.sprint.mission.discodeit.service.message.directMessage.DirectMessageService;
-import com.sprint.mission.discodeit.service.user.UserService;
-
-public interface AppFactory {
-
-    UserService getUserService();
-
-    UserRepository getUserRepository();
-
-    ChannelRepository getChannelRepository();
-
-    ChannelService getChannelService();
-
-    DirectMessageService getDirectMessageService();
-
-    DirectMessageRepository getDirectMessageRepository();
-
-    ChannelMessageRepository getChannelMessageRepository();
-
-    ChannelMessageService getChannelMessageService();
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/factory/ApplicationFileFactory.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/factory/ApplicationFileFactory.java
deleted file mode 100644
index 5fbd4063d..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/factory/ApplicationFileFactory.java
+++ /dev/null
@@ -1,100 +0,0 @@
-package com.sprint.mission.discodeit.config.factory;
-
-import com.sprint.mission.discodeit.repository.file.channel.FileChannelRepository;
-import com.sprint.mission.discodeit.repository.file.message.FileChannelMessageRepository;
-import com.sprint.mission.discodeit.repository.file.message.FileDirectMessageRepository;
-import com.sprint.mission.discodeit.repository.file.user.FileUserRepository;
-import com.sprint.mission.discodeit.repository.jcf.channel.ChannelRepository;
-import com.sprint.mission.discodeit.repository.jcf.message.ChannelMessage.ChannelMessageRepository;
-import com.sprint.mission.discodeit.repository.jcf.message.directMessage.DirectMessageRepository;
-import com.sprint.mission.discodeit.repository.jcf.user.UserRepository;
-import com.sprint.mission.discodeit.service.channel.ChannelService;
-import com.sprint.mission.discodeit.service.jcf.JCFChannelMessageService;
-import com.sprint.mission.discodeit.service.jcf.JCFChannelService;
-import com.sprint.mission.discodeit.service.jcf.JCFDirectMessageService;
-import com.sprint.mission.discodeit.service.jcf.JCFUserService;
-import com.sprint.mission.discodeit.service.message.channelMessage.ChannelMessageService;
-import com.sprint.mission.discodeit.service.message.directMessage.DirectMessageService;
-import com.sprint.mission.discodeit.service.user.UserService;
-
-public class ApplicationFileFactory implements AppFactory {
-
-    private static ApplicationFileFactory INSTANCE;
-
-
-    private final UserRepository userRepository;
-    private final UserService userService;
-
-    private final ChannelRepository channelRepository;
-    private final ChannelService channelService;
-
-    private final DirectMessageService directMessageService;
-    private final DirectMessageRepository directMessageRepository;
-
-    private final ChannelMessageService channelMessageService;
-    private final ChannelMessageRepository channelMessageRepository;
-
-    private static class SingleInstanceHolder {
-        private static final ApplicationFileFactory INSTANCE =
-                new ApplicationFileFactory();
-    }
-
-    public static synchronized ApplicationFileFactory getInstance() {
-        return SingleInstanceHolder.INSTANCE;
-    }
-
-
-    private ApplicationFileFactory() {
-        this.userRepository = FileUserRepository.getInstance();
-        this.channelRepository = FileChannelRepository.getInstance();
-        this.directMessageRepository = FileDirectMessageRepository.getInstance();
-        this.channelMessageRepository = FileChannelMessageRepository.getInstance();
-
-        this.userService = JCFUserService.getInstance(userRepository);
-        this.channelService = JCFChannelService.getInstance(userRepository, channelRepository);
-        this.directMessageService = JCFDirectMessageService.getInstance(directMessageRepository, userRepository);
-        this.channelMessageService = JCFChannelMessageService.getInstance(userRepository, channelRepository,
-                channelMessageRepository);
-    }
-
-
-    @Override
-    public UserService getUserService() {
-        return userService;
-    }
-
-    @Override
-    public UserRepository getUserRepository() {
-        return userRepository;
-    }
-
-    @Override
-    public ChannelRepository getChannelRepository() {
-        return channelRepository;
-    }
-
-    @Override
-    public ChannelService getChannelService() {
-        return channelService;
-    }
-
-    @Override
-    public DirectMessageService getDirectMessageService() {
-        return directMessageService;
-    }
-
-    @Override
-    public DirectMessageRepository getDirectMessageRepository() {
-        return directMessageRepository;
-    }
-
-    @Override
-    public ChannelMessageRepository getChannelMessageRepository() {
-        return channelMessageRepository;
-    }
-
-    @Override
-    public ChannelMessageService getChannelMessageService() {
-        return channelMessageService;
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/factory/ApplicationInMemoryFactory.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/factory/ApplicationInMemoryFactory.java
deleted file mode 100644
index 2c44fa0af..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/factory/ApplicationInMemoryFactory.java
+++ /dev/null
@@ -1,97 +0,0 @@
-package com.sprint.mission.discodeit.config.factory;
-
-import com.sprint.mission.discodeit.repository.jcf.channel.ChannelRepository;
-import com.sprint.mission.discodeit.repository.jcf.channel.JCFChannelRepositoryInMemory;
-import com.sprint.mission.discodeit.repository.jcf.message.ChannelMessage.ChannelMessageRepository;
-import com.sprint.mission.discodeit.repository.jcf.message.ChannelMessage.JCFChannelMessageRepositoryInMemory;
-import com.sprint.mission.discodeit.repository.jcf.message.directMessage.DirectMessageRepository;
-import com.sprint.mission.discodeit.repository.jcf.message.directMessage.JCFDirectMessageRepositoryInMemory;
-import com.sprint.mission.discodeit.repository.jcf.user.UserRepository;
-import com.sprint.mission.discodeit.repository.jcf.user.JCFUserRepositoryInMemory;
-import com.sprint.mission.discodeit.service.channel.ChannelService;
-import com.sprint.mission.discodeit.service.jcf.JCFChannelMessageService;
-import com.sprint.mission.discodeit.service.jcf.JCFChannelService;
-import com.sprint.mission.discodeit.service.jcf.JCFDirectMessageService;
-import com.sprint.mission.discodeit.service.jcf.JCFUserService;
-import com.sprint.mission.discodeit.service.message.channelMessage.ChannelMessageService;
-import com.sprint.mission.discodeit.service.message.directMessage.DirectMessageService;
-import com.sprint.mission.discodeit.service.user.UserService;
-
-/**
- *  빈으로 관리되는 스프링과 다르게 정확히 어떻게 구현해야하는지 알기가 어려웠음
- */
-public class ApplicationInMemoryFactory implements AppFactory {
-    private static ApplicationInMemoryFactory INSTANCE;
-
-    private final UserRepository userRepository;
-    private final UserService userService;
-
-    private final ChannelRepository channelRepository;
-    private final ChannelService channelService;
-
-    private final DirectMessageService directMessageService;
-    private final DirectMessageRepository directMessageRepository;
-
-    private final ChannelMessageService channelMessageService;
-    private final ChannelMessageRepository channelMessageRepository;
-
-    private static class SingleInstanceHolder {
-        private static final ApplicationInMemoryFactory INSTANCE =
-                new ApplicationInMemoryFactory();
-    }
-    private ApplicationInMemoryFactory() {
-        this.userRepository = JCFUserRepositoryInMemory.getInstance();
-        this.channelRepository = JCFChannelRepositoryInMemory.getChannelRepositoryInMemory();
-        this.directMessageRepository = JCFDirectMessageRepositoryInMemory.getInstance();
-        this.channelMessageRepository = JCFChannelMessageRepositoryInMemory.getInstance();
-
-        this.userService = JCFUserService.getInstance(userRepository);
-        this.channelService = JCFChannelService.getInstance(userRepository, channelRepository);
-        this.directMessageService = JCFDirectMessageService.getInstance(directMessageRepository, userRepository);
-        this.channelMessageService = JCFChannelMessageService.getInstance(userRepository, channelRepository, channelMessageRepository);
-    }
-
-    public static synchronized ApplicationInMemoryFactory getInstance() {
-        return SingleInstanceHolder.INSTANCE;
-    }
-
-    @Override
-    public UserService getUserService() {
-        return userService;
-    }
-
-    @Override
-    public ChannelService getChannelService() {
-        return channelService;
-    }
-
-    @Override
-    public UserRepository getUserRepository() {
-        return userRepository;
-    }
-
-    @Override
-    public ChannelRepository getChannelRepository() {
-        return channelRepository;
-    }
-
-    @Override
-    public DirectMessageService getDirectMessageService() {
-        return directMessageService;
-    }
-
-    @Override
-    public DirectMessageRepository getDirectMessageRepository() {
-        return directMessageRepository;
-    }
-
-    @Override
-    public ChannelMessageRepository getChannelMessageRepository() {
-        return channelMessageRepository;
-    }
-
-    @Override
-    public ChannelMessageService getChannelMessageService() {
-        return channelMessageService;
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/BirthDate.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/BirthDate.java
new file mode 100644
index 000000000..ff4f2883f
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/BirthDate.java
@@ -0,0 +1,16 @@
+package com.sprint.mission.discodeit.domain.user;
+
+import java.time.LocalDate;
+
+public class BirthDate {
+
+    private final LocalDate value;
+
+    public BirthDate(int year, int month, int day) {
+        this.value = LocalDate.of(year, month, day);
+    }
+
+    public LocalDate getValue() {
+        return value;
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Email.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Email.java
index f8d1cdbe3..7ec6f463b 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Email.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Email.java
@@ -14,6 +14,6 @@ public class Email {
 
     public Email(String email) {
         EmailValidator.valid(email);
-        this.value = email;
+        this.value = email.trim();
     }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Nickname.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Nickname.java
index 9b488f3dd..283f2cb4d 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Nickname.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Nickname.java
@@ -14,7 +14,7 @@ public class Nickname {
 
     public Nickname(String value) {
         NicknameValidator.validate(value);
-        this.value = value;
+        this.value = value.trim();
     }
 
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Password.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Password.java
new file mode 100644
index 000000000..8eb906f79
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Password.java
@@ -0,0 +1,14 @@
+package com.sprint.mission.discodeit.domain.user;
+
+public class Password {
+
+    private final String value;
+
+    public Password(String value) {
+        this.value = value;
+    }
+
+    public String getValue() {
+        return value;
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/User.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/User.java
new file mode 100644
index 000000000..0d07babfc
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/User.java
@@ -0,0 +1,91 @@
+package com.sprint.mission.discodeit.domain.user;
+
+import com.sprint.mission.discodeit.domain.user.enums.EmailSubscriptionStatus;
+import java.time.LocalDateTime;
+import java.util.Objects;
+import java.util.UUID;
+
+public class User {
+
+    private final UUID id;
+    private final Nickname nickname;
+    private final Nickname username;
+    private final Email email;
+    private final Password password;
+    private final BirthDate birthDate;
+    private final LocalDateTime createdAt;
+    private final LocalDateTime updatedAt;
+    private final EmailSubscriptionStatus emailSubscriptionStatus;
+
+    public User(
+            Nickname nickname,
+            Nickname username,
+            Email email,
+            Password password,
+            BirthDate birthDate,
+            EmailSubscriptionStatus emailSubscriptionStatus
+    ) {
+        this.id = UUID.randomUUID();
+        this.createdAt = LocalDateTime.now();
+        this.updatedAt = LocalDateTime.now();
+        this.nickname = nickname;
+        this.username = username;
+        this.email = email;
+        this.password = password;
+        this.birthDate = birthDate;
+        this.emailSubscriptionStatus = emailSubscriptionStatus;
+    }
+
+    public UUID getId() {
+        return id;
+    }
+
+    public Nickname getNickname() {
+        return nickname;
+    }
+
+    public Email getEmail() {
+        return email;
+    }
+
+    public LocalDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public LocalDateTime getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public Nickname getUsername() {
+        return username;
+    }
+
+    public Password getPassword() {
+        return password;
+    }
+
+    public BirthDate getBirthDate() {
+        return birthDate;
+    }
+
+    public EmailSubscriptionStatus getEmailSubscriptionStatus() {
+        return emailSubscriptionStatus;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        User user = (User) o;
+        return Objects.equals(id, user.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(id);
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Username.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Username.java
new file mode 100644
index 000000000..f4b7d4da1
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Username.java
@@ -0,0 +1,20 @@
+package com.sprint.mission.discodeit.domain.user;
+
+import com.sprint.mission.discodeit.domain.user.validation.UsernameValidator;
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.ToString;
+
+@Getter
+@EqualsAndHashCode(of = "value")
+@ToString(of = "value")
+public class Username {
+
+    private final String value;
+
+    public Username(String value) {
+        UsernameValidator.validate(value);
+        this.value = value.trim();
+    }
+
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/enums/EmailSubscriptionStatus.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/enums/EmailSubscriptionStatus.java
new file mode 100644
index 000000000..6c2016b9f
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/enums/EmailSubscriptionStatus.java
@@ -0,0 +1,6 @@
+package com.sprint.mission.discodeit.domain.user.enums;
+
+public enum EmailSubscriptionStatus {
+    SUBSCRIBED,
+    UNSUBSCRIBED,
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/exception/EmailInvalidException.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/exception/EmailInvalidException.java
new file mode 100644
index 000000000..6337e6172
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/exception/EmailInvalidException.java
@@ -0,0 +1,12 @@
+package com.sprint.mission.discodeit.domain.user.exception;
+
+import com.sprint.mission.discodeit.global.error.ErrorCode;
+import com.sprint.mission.discodeit.global.error.exception.InvalidException;
+
+public class EmailInvalidException extends InvalidException {
+
+    public EmailInvalidException(ErrorCode errorCode, String message) {
+        super(errorCode, message);
+    }
+
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/exception/NickNameInvalidException.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/exception/NickNameInvalidException.java
new file mode 100644
index 000000000..32609bdd8
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/exception/NickNameInvalidException.java
@@ -0,0 +1,11 @@
+package com.sprint.mission.discodeit.domain.user.exception;
+
+import com.sprint.mission.discodeit.global.error.ErrorCode;
+import com.sprint.mission.discodeit.global.error.exception.InvalidException;
+
+public class NickNameInvalidException extends InvalidException {
+
+    public NickNameInvalidException(ErrorCode errorCode, String inputValue) {
+        super(errorCode, inputValue);
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/exception/PassWordInvalidException.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/exception/PassWordInvalidException.java
new file mode 100644
index 000000000..dc899555c
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/exception/PassWordInvalidException.java
@@ -0,0 +1,11 @@
+package com.sprint.mission.discodeit.domain.user.exception;
+
+import com.sprint.mission.discodeit.global.error.ErrorCode;
+import com.sprint.mission.discodeit.global.error.exception.InvalidException;
+
+public class PassWordInvalidException extends InvalidException {
+
+    public PassWordInvalidException(ErrorCode errorCode, String message) {
+        super(errorCode, message);
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/exception/UserNameInvalidException.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/exception/UserNameInvalidException.java
new file mode 100644
index 000000000..28685110a
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/exception/UserNameInvalidException.java
@@ -0,0 +1,11 @@
+package com.sprint.mission.discodeit.domain.user.exception;
+
+import com.sprint.mission.discodeit.global.error.ErrorCode;
+import com.sprint.mission.discodeit.global.error.exception.InvalidException;
+
+public class UserNameInvalidException extends InvalidException {
+
+    public UserNameInvalidException(ErrorCode errorCode, String message) {
+        super(errorCode, message);
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/EmailValidator.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/EmailValidator.java
index 7959b3655..22549af1d 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/EmailValidator.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/EmailValidator.java
@@ -1,22 +1,25 @@
 package com.sprint.mission.discodeit.domain.user.validation;
 
+import com.sprint.mission.discodeit.domain.user.exception.EmailInvalidException;
+import com.sprint.mission.discodeit.global.error.ErrorCode;
+import java.util.Objects;
 import java.util.regex.Pattern;
-import org.springframework.util.Assert;
 
 public class EmailValidator {
 
-    private final static String EMAIL_REGEX = "^[a-zA-Z0-9_+&*-]+(?:\\." + "[a-zA-Z0-9_+&*-]+)*@" + "(?:[a-zA-Z0-9-]+\\.)+[a-z" + "A-Z]{2,7}$";
+    private final static String EMAIL_REGEX =
+            "^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9-]+(?:\\.[a-zA-Z]{2,7})+$";
+
     private final static Pattern EMAIL_PATTERN = Pattern.compile(EMAIL_REGEX);
 
 
     public static void valid(String email) {
-        Assert.notNull(email, "이메일은 필수입니다.");
-        if (email.isBlank()) {
-            throw new IllegalArgumentException("이메일은 필수입니다.");
+        if (Objects.isNull(email)) {
+            throw new EmailInvalidException(ErrorCode.EMAIL_REQUIRED, "");
         }
-
-        if (!EMAIL_PATTERN.matcher(email).matches()) {
-            throw new IllegalArgumentException("이메일 형식이 틀렸습니다 : 입력 = " + email);
+        if (email.isBlank() || !EMAIL_PATTERN.matcher(email).matches()) {
+            throw new EmailInvalidException(ErrorCode.INVALID_EMAIL_FORMAT, email);
         }
+
     }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/NicknameValidator.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/NicknameValidator.java
index 96afad98a..c741fc717 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/NicknameValidator.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/NicknameValidator.java
@@ -1,23 +1,31 @@
 package com.sprint.mission.discodeit.domain.user.validation;
 
-import org.springframework.util.Assert;
+import com.sprint.mission.discodeit.domain.user.exception.NickNameInvalidException;
+import com.sprint.mission.discodeit.global.error.ErrorCode;
+import java.util.Objects;
+import java.util.Set;
 
 public class NicknameValidator {
-    private static final int MAX_LENGTH = 15;
-    private static final int MIN_LENGTH = 1;
-    private static final String LENGTH_ERROR_MESSAGE = "닉네임은 " + MIN_LENGTH + " ~ " + MAX_LENGTH + "제한입니다. : 입력한 이름 길이 = ";
+    private static final int MAX_LENGTH = 32;
+    private static final Set<String> FORBIDDEN_WORDS = Set.of(
+            "admin", "moderator", "discord", "system", "root", "bot", "mod",
+            "운영자", "관리자", "봇"
+    );
 
     public static void validate(String value) {
-        Assert.notNull(value, "닉네임은 필수입니다.");
+        if (Objects.isNull(value)) {
+            throw new NickNameInvalidException(ErrorCode.NICKNAME_REQUIRED, "");
+        }
 
-        if (value.isBlank() || value.length() > MAX_LENGTH || value.length() < MIN_LENGTH) {
-            throw new IllegalArgumentException(provideLengthNameErrorMessage(value));
+        if (value.isBlank() || value.length() > MAX_LENGTH) {
+            throw new NickNameInvalidException(ErrorCode.INVALID_NICKNAME_LENGTH, value);
         }
-    }
 
-    // TODO 에러 관리 따로 관리하기.
-    private static String provideLengthNameErrorMessage(String value) {
-        return LENGTH_ERROR_MESSAGE + value.length();
+        String lowerCase = value.toLowerCase();
+        for (String word : FORBIDDEN_WORDS) {
+            if (lowerCase.contains(word)) {
+                throw new NickNameInvalidException(ErrorCode.INVALID_NICKNAME_FORMAT, value);
+            }
+        }
     }
-
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/UsernameValidator.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/UsernameValidator.java
new file mode 100644
index 000000000..e373bffdd
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/UsernameValidator.java
@@ -0,0 +1,42 @@
+package com.sprint.mission.discodeit.domain.user.validation;
+
+import com.sprint.mission.discodeit.domain.user.exception.UserNameInvalidException;
+import com.sprint.mission.discodeit.global.error.ErrorCode;
+import java.util.Objects;
+import java.util.Set;
+import java.util.regex.Pattern;
+
+public class UsernameValidator {
+    private static final int MIN_LENGTH = 2;
+    private static final int MAX_LENGTH = 32;
+    private static final String VALID_USER_NAME_REGEX =
+            "^(?!.*\\.\\.)(?![.])(?!.*[.]$)[a-zA-Z0-9_.]{2,32}$";
+    private static final Pattern VALID_USER_NAME_PATTERN = Pattern.compile(VALID_USER_NAME_REGEX);
+    private static final Set<String> FORBIDDEN_WORD =
+            Set.of(
+                    "admin", "moderator", "discord", "system", "root", "bot", "mod",
+                    "운영자", "관리자", "봇"
+            );
+
+
+    public static void validate(final String username) {
+        if (Objects.isNull(username)) {
+            throw new UserNameInvalidException(ErrorCode.USERNAME_REQUIRED, "");
+        }
+
+        if (username.length() > MAX_LENGTH || username.length() < MIN_LENGTH) {
+            throw new UserNameInvalidException(ErrorCode.INVALID_USERNAME_LENGTH, username);
+        }
+
+        if (!VALID_USER_NAME_PATTERN.matcher(username).matches()) {
+            throw new UserNameInvalidException(ErrorCode.INVALID_USERNAME_FORMAT, username);
+        }
+
+        String lowerUsername = username.toLowerCase();
+        for (String word : FORBIDDEN_WORD) {
+            if (lowerUsername.contains(word)) {
+                throw new UserNameInvalidException(ErrorCode.INVALID_USERNAME_FORMAT, username);
+            }
+        }
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/binarycontent/BinaryContent.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/binarycontent/BinaryContent.java
deleted file mode 100644
index 9ea3a147a..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/binarycontent/BinaryContent.java
+++ /dev/null
@@ -1,22 +0,0 @@
-package com.sprint.mission.discodeit.entity.binarycontent;
-
-import java.io.File;
-import java.time.Instant;
-import java.util.Objects;
-import java.util.UUID;
-import lombok.Getter;
-
-@Getter
-public class BinaryContent {
-    private final UUID id;
-    private final Instant createdAt;
-    private final File file;
-
-    public BinaryContent(File file) {
-        Objects.requireNonNull(file, "file is null");
-        this.id = UUID.randomUUID();
-        this.createdAt = Instant.now();
-        this.file = file;
-    }
-
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/channel/Channel.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/channel/Channel.java
deleted file mode 100644
index 3db158c01..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/channel/Channel.java
+++ /dev/null
@@ -1,92 +0,0 @@
-package com.sprint.mission.discodeit.entity.channel;
-
-import com.google.common.base.Preconditions;
-import com.sprint.mission.discodeit.common.error.ErrorMessage;
-import com.sprint.mission.discodeit.common.error.channel.ChannelException;
-import com.sprint.mission.discodeit.entity.common.BaseEntity;
-import com.sprint.mission.discodeit.entity.user.entity.User;
-import jakarta.validation.constraints.NotNull;
-import jakarta.validation.constraints.Size;
-import lombok.Getter;
-
-@Getter
-public class Channel extends BaseEntity {
-
-    @NotNull
-    @Size(
-            min = 3, max = 50,
-            message = "create channel must be between {min} and {max} : reject channel name `${validatedValue}`"
-    )
-    private String channelName;
-
-    private final User creator;
-
-    private Channel(String channelName, User creator) {
-        this.channelName = channelName;
-        this.creator = creator;
-    }
-
-    public static Channel createOfChannelNameAndUser(
-            String channelName,
-            User creator
-    ) {
-
-        return new Channel(channelName, creator);
-    }
-
-    public static Channel createDefaultNameAndUser(User user) {
-
-        return new Channel("Default Channel Name", user);
-    }
-
-    public void changeName(String newName, User user) {
-        checkCreatorEqualsOrThrow(user);
-
-        channelName = newName;
-        updateStatusAndUpdateAt();
-    }
-
-    public void deleteChannel(User user) {
-        checkCreatorEqualsOrThrow(user);
-
-        updateUnregistered();
-    }
-
-    public boolean isStatusNotUnregisteredAndEqualsTo(String channelName) {
-        return isNotUnregistered() && this.channelName.equals(channelName);
-    }
-
-    private void checkCreatorEqualsOrThrow(User user) {
-        var isNotCreator = isNotCreator(user);
-
-        if (isNotCreator) {
-            throw ChannelException.ofErrorMessageAndCreatorName(
-                    ErrorMessage.CHANNEL_NOT_EQUAL_CREATOR,
-                    user.getNicknameValue()
-            );
-        }
-    }
-
-    private boolean isNotCreator(User user) {
-        Preconditions.checkNotNull(user);
-        return !creator.equals(user);
-    }
-
-    public String getCreatorName() {
-        return creator.getNicknameValue();
-    }
-
-    @Override
-    public String toString() {
-        var format =
-                String.format(
-                "channel info = [channel name = %s creator = %s, createAt = %d, updateAt = %d, status = %s]",
-                        channelName,
-                        creator.getName(),
-                        getCreateAt().toEpochMilli(),
-                        getUpdateAt().toEpochMilli(),
-                        getStatus().toString()
-        );
-        return format;
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/channel/dto/ChangeChannelNameRequest.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/channel/dto/ChangeChannelNameRequest.java
deleted file mode 100644
index 353426161..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/channel/dto/ChangeChannelNameRequest.java
+++ /dev/null
@@ -1,6 +0,0 @@
-package com.sprint.mission.discodeit.entity.channel.dto;
-
-import java.util.UUID;
-
-public record ChangeChannelNameRequest(UUID userId, UUID channelId, String newChannelName) {
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/channel/dto/ChannelResponse.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/channel/dto/ChannelResponse.java
deleted file mode 100644
index 5a115af80..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/channel/dto/ChannelResponse.java
+++ /dev/null
@@ -1,48 +0,0 @@
-package com.sprint.mission.discodeit.entity.channel.dto;
-
-import java.util.UUID;
-
-public record ChannelResponse(UUID channelId, String channelName, String creator, String status) {
-
-//    public static ChannelResponse ofChannelIdNameCreatorStatus(UUID channelId, String channelName, String creator, String status) {
-//        // 이게 맞나... 모든 파라미터를 null check
-//        Preconditions.checkNotNull(channelId);
-//        Preconditions.checkNotNull(channelName);
-//        Preconditions.checkNotNull(creator);
-//        Preconditions.checkNotNull(status);
-//        return new ChannelResponse(channelId, channelName, creator, status);
-//    }
-
-    public static final class Builder {
-        private UUID channelId;
-        private String channelName;
-        private String creator;
-        private String status;
-
-        public Builder() {}
-
-        public Builder channelId(UUID channelId) {
-            this.channelId = channelId;
-            return this;
-        }
-
-        public Builder channelName(String channelName) {
-            this.channelName = channelName;
-            return this;
-        }
-
-        public Builder creator(String creator) {
-            this.creator = creator;
-            return this;
-        }
-
-        public Builder status(String status) {
-            this.status = status;
-            return this;
-        }
-
-        public ChannelResponse build() {
-            return new ChannelResponse(channelId, channelName, creator, status);
-        }
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/channel/dto/CreateNewChannelRequest.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/channel/dto/CreateNewChannelRequest.java
deleted file mode 100644
index ba483eacf..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/channel/dto/CreateNewChannelRequest.java
+++ /dev/null
@@ -1,13 +0,0 @@
-package com.sprint.mission.discodeit.entity.channel.dto;
-
-import jakarta.validation.constraints.NotBlank;
-import jakarta.validation.constraints.NotNull;
-import java.util.UUID;
-
-public record CreateNewChannelRequest(
-        @NotNull
-        UUID userId,
-        @NotBlank
-        String channelName
-) {
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/channel/dto/DeleteChannelRequest.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/channel/dto/DeleteChannelRequest.java
deleted file mode 100644
index 59ad9711d..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/channel/dto/DeleteChannelRequest.java
+++ /dev/null
@@ -1,6 +0,0 @@
-package com.sprint.mission.discodeit.entity.channel.dto;
-
-import java.util.UUID;
-
-public record DeleteChannelRequest(UUID userId, UUID channelId) {
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/common/BaseEntity.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/common/BaseEntity.java
deleted file mode 100644
index f68cf9782..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/common/BaseEntity.java
+++ /dev/null
@@ -1,72 +0,0 @@
-package com.sprint.mission.discodeit.entity.common;
-
-import static com.sprint.mission.discodeit.entity.common.Status.MODIFIED;
-import static com.sprint.mission.discodeit.entity.common.Status.REGISTERED;
-import static com.sprint.mission.discodeit.entity.common.Status.UNREGISTERED;
-
-import com.google.common.base.Preconditions;
-import java.io.Serial;
-import java.io.Serializable;
-import java.time.Instant;
-import java.util.UUID;
-import lombok.Getter;
-
-@Getter
-public abstract class BaseEntity implements Serializable {
-
-    @Serial
-    private static final long serialVersionUID = -2898060967687082469L;
-    private final UUID id;
-
-    private final Instant createAt;
-
-    private Instant updateAt;
-
-    private Status status;
-
-    protected BaseEntity() {
-        this.id = UUID.randomUUID();
-        this.createAt = createUnixTimestamp();
-        this.updateAt = createUnixTimestamp();
-        this.status = REGISTERED;
-    }
-
-    private void updateStatus(Status status) {
-        Preconditions.checkNotNull(status);
-        this.status = status;
-        this.updateAt = createUnixTimestamp();
-    }
-
-    public void updateStatusAndUpdateAt() {
-        updateStatus(MODIFIED);
-    }
-
-    public void updateUnregistered() {
-        updateStatus(UNREGISTERED);
-    }
-
-    public boolean isNotUnregistered() {
-        return status != UNREGISTERED;
-    }
-
-    private Instant createUnixTimestamp() {
-        return Instant.now();
-    }
-
-    @Override
-    public boolean equals(Object o) {
-        if (this == o) {
-            return true;
-        }
-        if (o == null || getClass() != o.getClass()) {
-            return false;
-        }
-        BaseEntity that = (BaseEntity) o;
-        return id.equals(that.id);
-    }
-
-    @Override
-    public int hashCode() {
-        return id.hashCode();
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/common/Status.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/common/Status.java
deleted file mode 100644
index a68e90b3d..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/common/Status.java
+++ /dev/null
@@ -1,19 +0,0 @@
-package com.sprint.mission.discodeit.entity.common;
-
-public enum Status {
-
-    MODIFIED("수정"),
-    REGISTERED("등록"),
-    UNREGISTERED("해지")
-    ;
-
-    private final String status;
-
-    Status(String status) {
-        this.status = status;
-    }
-
-    public String getStatus() {
-        return status;
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/ChannelMessage.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/ChannelMessage.java
deleted file mode 100644
index 0f252ebef..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/ChannelMessage.java
+++ /dev/null
@@ -1,50 +0,0 @@
-package com.sprint.mission.discodeit.entity.message;
-
-import com.sprint.mission.discodeit.entity.channel.Channel;
-import com.sprint.mission.discodeit.entity.common.BaseEntity;
-import com.sprint.mission.discodeit.entity.user.entity.User;
-import lombok.Getter;
-
-@Getter
-public class ChannelMessage extends BaseEntity {
-
-    private final Sender<User, Channel> sender;
-
-    private final String message;
-
-    private final User messageSender;
-
-    private final Channel receiverChannel;
-
-    private ChannelMessage(Sender<User, Channel> sender, String message, User messageSender, Channel receiverChannel) {
-        this.sender = sender;
-        this.message = message;
-        this.messageSender = messageSender;
-        this.receiverChannel = receiverChannel;
-    }
-
-    public static ChannelMessage ofMessageAndSenderAndReceiverChannel(
-            String message,
-            User messageSender,
-            Channel receiverChannel
-    ) {
-
-        Sender<User, Channel> channelSender = (sender, receiver, message1) -> {
-            var format = String.format(
-                    "보낸 사람 : %s , 수신 채널 : %s , 메시지 : %s",
-                    sender.getName(),
-                    receiver.getChannelName(),
-                    message1
-            );
-
-            System.out.println(format);
-        };
-
-        return new ChannelMessage(channelSender, message, messageSender, receiverChannel);
-    }
-
-    public void sendMessage() {
-        sender.sendMessage(messageSender, receiverChannel, message);
-    }
-
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/DirectMessage.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/DirectMessage.java
deleted file mode 100644
index aa2404042..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/DirectMessage.java
+++ /dev/null
@@ -1,42 +0,0 @@
-package com.sprint.mission.discodeit.entity.message;
-
-import com.sprint.mission.discodeit.entity.common.BaseEntity;
-import com.sprint.mission.discodeit.entity.user.entity.User;
-import lombok.Getter;
-
-@Getter
-public class DirectMessage extends BaseEntity {
-    // 보내는 방법을 추상화
-    private final transient Sender<User, User> sender;
-
-    private final String message;
-
-    private final User messageSender;
-
-    private final User messageReceiver;
-
-    private DirectMessage(Sender<User, User> sender, String message, User messageSender, User messageReceiver) {
-        this.sender = sender;
-        this.message = message;
-        this.messageSender = messageSender;
-        this.messageReceiver = messageReceiver;
-    }
-
-    public static DirectMessage ofMessageAndSenderReceiver(String message, User messageSender, User messageReceiver) {
-        Sender<User, User> sender = (sender1, receiver1, message1) -> {
-            var format = String.format(
-                    "보낸 사람 : %s , 보낸 사람 : %s, 메시지 : %s",
-                    sender1.getName(),
-                    receiver1.getName(),
-                    message
-            );
-        };
-
-        return new DirectMessage(sender, message, messageSender, messageReceiver);
-    }
-
-    public void sendMessage() {
-        sender.sendMessage(messageSender, messageReceiver, message);
-    }
-
-}
\ No newline at end of file
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/Sender.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/Sender.java
deleted file mode 100644
index 0e045fe12..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/Sender.java
+++ /dev/null
@@ -1,6 +0,0 @@
-package com.sprint.mission.discodeit.entity.message;
-
-public interface Sender<T, V> {
-
-    void sendMessage(T sender, V receiver, String message);
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/dto/ChannelMessageInfoResponse.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/dto/ChannelMessageInfoResponse.java
deleted file mode 100644
index b4e45760b..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/dto/ChannelMessageInfoResponse.java
+++ /dev/null
@@ -1,37 +0,0 @@
-package com.sprint.mission.discodeit.entity.message.dto;
-
-import java.util.UUID;
-
-public record ChannelMessageInfoResponse(UUID messageId, UUID sendUserId, UUID receiveChannelId, String message) {
-
-    public static final class Builder {
-        private UUID messageId;
-        private UUID sendUserId;
-        private UUID receiveChannelId;
-        private String message;
-
-        public Builder messageId(UUID messageId) {
-            this.messageId = messageId;
-            return this;
-        }
-
-        public Builder sendUserId(UUID sendUserId) {
-            this.sendUserId = sendUserId;
-            return this;
-        }
-
-        public Builder receiveChannelId(UUID receiveChannelId) {
-            this.receiveChannelId = receiveChannelId;
-            return this;
-        }
-
-        public Builder message(String message) {
-            this.message = message;
-            return this;
-        }
-
-        public ChannelMessageInfoResponse build() {
-            return new ChannelMessageInfoResponse(messageId, sendUserId, receiveChannelId, message);
-        }
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/dto/DirectMessageInfoResponse.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/dto/DirectMessageInfoResponse.java
deleted file mode 100644
index 12b33ab8d..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/dto/DirectMessageInfoResponse.java
+++ /dev/null
@@ -1,37 +0,0 @@
-package com.sprint.mission.discodeit.entity.message.dto;
-
-import java.util.UUID;
-
-public record DirectMessageInfoResponse(UUID messageId, UUID sender, UUID receiver, String message) {
-
-    public static final class Builder {
-        private UUID messageId;
-        private UUID sender;
-        private UUID receiver;
-        private String message;
-
-        public Builder messageId(UUID messageId) {
-            this.messageId = messageId;
-            return this;
-        }
-
-        public Builder sender(UUID sender) {
-            this.sender = sender;
-            return this;
-        }
-
-        public Builder receiver(UUID receiver) {
-            this.receiver = receiver;
-            return this;
-        }
-
-        public Builder message(String message) {
-            this.message = message;
-            return this;
-        }
-
-        public DirectMessageInfoResponse build() {
-            return new DirectMessageInfoResponse(messageId, sender, receiver, message);
-        }
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/dto/SendChannelMessageRequest.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/dto/SendChannelMessageRequest.java
deleted file mode 100644
index af623b217..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/dto/SendChannelMessageRequest.java
+++ /dev/null
@@ -1,7 +0,0 @@
-package com.sprint.mission.discodeit.entity.message.dto;
-
-import java.util.UUID;
-
-public record SendChannelMessageRequest(UUID sendUserId, UUID receiveChannelId, String message) {
-
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/dto/SendDirectMessageRequest.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/dto/SendDirectMessageRequest.java
deleted file mode 100644
index 2d79975a4..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/message/dto/SendDirectMessageRequest.java
+++ /dev/null
@@ -1,6 +0,0 @@
-package com.sprint.mission.discodeit.entity.message.dto;
-
-import java.util.UUID;
-
-public record SendDirectMessageRequest(UUID sendUserId, UUID receiveUserId, String message) {
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/readstatus/ReadStatus.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/readstatus/ReadStatus.java
deleted file mode 100644
index bf0a0ce23..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/readstatus/ReadStatus.java
+++ /dev/null
@@ -1,32 +0,0 @@
-package com.sprint.mission.discodeit.entity.readstatus;
-
-import com.sprint.mission.discodeit.entity.user.entity.User;
-import java.time.Instant;
-import java.util.Objects;
-import java.util.UUID;
-import lombok.Getter;
-
-@Getter
-public class ReadStatus {
-
-    private final UUID id;
-    private final Instant createdAt;
-    private Instant updatedAt;
-    private boolean isRead;
-    private final User user;
-
-    public ReadStatus(User user) {
-        Objects.requireNonNull(user, "user is null");
-        this.id = UUID.randomUUID();
-        this.createdAt = Instant.now();
-        this.updatedAt = Instant.now();
-        this.isRead = false;
-        this.user = user;
-    }
-
-    public void updateReadStatusByReading() {
-        this.isRead = true;
-        this.updatedAt = Instant.now();
-    }
-
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/dto/ExitChannelRequest.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/dto/ExitChannelRequest.java
deleted file mode 100644
index be7b46381..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/dto/ExitChannelRequest.java
+++ /dev/null
@@ -1,6 +0,0 @@
-package com.sprint.mission.discodeit.entity.user.dto;
-
-import java.util.UUID;
-
-public record ExitChannelRequest(UUID userId, UUID channelId) {
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/dto/FindUserRequest.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/dto/FindUserRequest.java
deleted file mode 100644
index 78dba1e3e..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/dto/FindUserRequest.java
+++ /dev/null
@@ -1,4 +0,0 @@
-package com.sprint.mission.discodeit.entity.user.dto;
-
-public record FindUserRequest(String username) {
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/dto/ModifyUserInfoRequest.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/dto/ModifyUserInfoRequest.java
deleted file mode 100644
index d414afc40..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/dto/ModifyUserInfoRequest.java
+++ /dev/null
@@ -1,6 +0,0 @@
-package com.sprint.mission.discodeit.entity.user.dto;
-
-import java.util.UUID;
-
-public record ModifyUserInfoRequest(UUID id, String changeUsername) {
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/dto/RegisterUserRequest.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/dto/RegisterUserRequest.java
deleted file mode 100644
index e910c87e4..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/dto/RegisterUserRequest.java
+++ /dev/null
@@ -1,4 +0,0 @@
-package com.sprint.mission.discodeit.entity.user.dto;
-
-public record RegisterUserRequest(String name) {
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/dto/UnregisterUserRequest.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/dto/UnregisterUserRequest.java
deleted file mode 100644
index 502ea8ae6..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/dto/UnregisterUserRequest.java
+++ /dev/null
@@ -1,6 +0,0 @@
-package com.sprint.mission.discodeit.entity.user.dto;
-
-import java.util.UUID;
-
-public record UnregisterUserRequest(UUID id, String username) {
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/dto/UserInfoResponse.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/dto/UserInfoResponse.java
deleted file mode 100644
index 37f6a46d2..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/dto/UserInfoResponse.java
+++ /dev/null
@@ -1,7 +0,0 @@
-package com.sprint.mission.discodeit.entity.user.dto;
-
-import com.sprint.mission.discodeit.entity.common.Status;
-import java.util.UUID;
-
-public record UserInfoResponse(UUID uuid, String username, Status status) {
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/entity/ParticipatedChannel.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/entity/ParticipatedChannel.java
deleted file mode 100644
index 12d051197..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/entity/ParticipatedChannel.java
+++ /dev/null
@@ -1,99 +0,0 @@
-package com.sprint.mission.discodeit.entity.user.entity;
-
-import static com.sprint.mission.discodeit.common.error.ErrorMessage.USER_NOT_PARTICIPATED_CHANNEL;
-
-import com.sprint.mission.discodeit.common.error.channel.ChannelException;
-import com.sprint.mission.discodeit.common.error.user.UserException;
-import com.sprint.mission.discodeit.entity.channel.Channel;
-import com.sprint.mission.discodeit.entity.common.Status;
-import java.io.Serial;
-import java.io.Serializable;
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.Optional;
-import java.util.UUID;
-import lombok.Getter;
-
-public class ParticipatedChannel implements Serializable {
-
-    @Serial
-    private static final long serialVersionUID = -2880824194029612128L;
-
-    private final Map<UUID, Channel> participatedChannels;
-
-    private ParticipatedChannel(Map<UUID, Channel> channels) {
-        this.participatedChannels = channels;
-    }
-
-    public static ParticipatedChannel newDefault() {
-        return new ParticipatedChannel(new HashMap<>());
-    }
-
-    public Channel createChannel(String channelName, User user) {
-        var createdChannel = Channel.createOfChannelNameAndUser(channelName, user);
-        participatedChannels.put(createdChannel.getId(), createdChannel);
-
-        return createdChannel;
-    }
-
-    public List<Channel> findAllChannels() {
-        var participatedChannels =
-                this.participatedChannels.values()
-                        .stream()
-                        .filter(Channel::isNotUnregistered)
-                        .toList();
-
-        return Collections.unmodifiableList(participatedChannels);
-    }
-
-    private Optional<Channel> findByChannelId(UUID channelId) {
-        var foundParticipatedChannel = participatedChannels.get(channelId);
-        return Optional.ofNullable(foundParticipatedChannel);
-    }
-
-    public Optional<Channel> findByChannelIdNotUnregisteredOrThrow(UUID channelId) {
-        var foundChannel =
-                findByChannelId(channelId)
-                        .orElseThrow(
-                                () -> ChannelException.ofErrorMessageAndNotExistChannelId(USER_NOT_PARTICIPATED_CHANNEL, channelId));
-
-        var unregisteredReturnNullOrFoundChannel =
-                foundChannel.getStatus() == Status.UNREGISTERED ? null : foundChannel;
-
-        return Optional.ofNullable(unregisteredReturnNullOrFoundChannel);
-    }
-
-    // TODO 같은 이름을 가진 채널이 여러 개 있을 수 있음. 리스트로 반환 고려해야하지 않을까?
-    public Optional<Channel> findByName(String name) {
-        var foundChannelByName = participatedChannels.values()
-                .stream()
-                .filter(channel -> channel.isStatusNotUnregisteredAndEqualsTo(name))
-                .findFirst();
-
-        return foundChannelByName;
-    }
-
-    public Channel changeChannelNameOrThrow(UUID channelId, String newName, User user) {
-        var foundChannel =
-                findByChannelIdNotUnregisteredOrThrow(channelId)
-                        .orElseThrow(
-                                () -> UserException.ofErrorMessageAndId(USER_NOT_PARTICIPATED_CHANNEL,
-                                        channelId.toString()));
-
-        foundChannel.changeName(newName, user);
-        participatedChannels.put(foundChannel.getId(), foundChannel);
-
-        return foundChannel;
-    }
-
-    public void exitChannelById(UUID channelId) {
-        findByChannelId(channelId)
-                .ifPresent(foundChannel -> participatedChannels.remove(foundChannel.getId()));
-    }
-
-    public int countParticipatedChannels() {
-        return participatedChannels.size();
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/entity/User.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/entity/User.java
deleted file mode 100644
index fe3a782fa..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/entity/User.java
+++ /dev/null
@@ -1,74 +0,0 @@
-package com.sprint.mission.discodeit.entity.user.entity;
-
-
-import com.google.common.base.Preconditions;
-import com.sprint.mission.discodeit.entity.channel.Channel;
-import com.sprint.mission.discodeit.entity.common.BaseEntity;
-import com.sprint.mission.discodeit.domain.user.Email;
-import com.sprint.mission.discodeit.domain.user.Nickname;
-import java.util.List;
-import java.util.UUID;
-import lombok.Getter;
-import lombok.ToString;
-
-@Getter
-@ToString
-public class User extends BaseEntity {
-
-    private Nickname name;
-    private Email email;
-    private final ParticipatedChannel participatedChannels;
-
-    private User(Nickname name, ParticipatedChannel channel) {
-        this.name = name;
-        this.participatedChannels = channel;
-    }
-
-    public static User createFrom(String username) {
-        var userName = new Nickname(username);
-        var participatedChannel = ParticipatedChannel.newDefault();
-        return new User(userName, participatedChannel);
-    }
-
-    public void changeUserName(String newName) {
-        this.name = new Nickname(newName);
-        updateStatusAndUpdateAt();
-    }
-
-    public Channel openNewChannel(String channelName) {
-        Preconditions.checkNotNull(channelName);
-        var createdChannel = participatedChannels.createChannel(channelName, this);
-        return createdChannel;
-    }
-
-    public Channel changeChannelName(UUID channelId, String channelName) {
-        Preconditions.checkNotNull(channelId);
-        var targetChannel =
-                participatedChannels.changeChannelNameOrThrow(channelId, channelName, this);
-
-        return targetChannel;
-    }
-
-    public void exitParticipatedChannel(UUID channelId) {
-        participatedChannels.exitChannelById(channelId);
-    }
-
-    public int countParticipatedChannels() {
-        var participatedChannelCount = participatedChannels.countParticipatedChannels();
-        return participatedChannelCount;
-    }
-
-    public List<Channel> getParticipatedChannels() {
-        return participatedChannels.findAllChannels();
-    }
-
-    public void unregister() {
-        updateUnregistered();
-    }
-
-    public String getNicknameValue() {
-        return name.getValue();
-    }
-
-}
-
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/entity/UserName.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/entity/UserName.java
deleted file mode 100644
index 9c3e7282a..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/user/entity/UserName.java
+++ /dev/null
@@ -1,64 +0,0 @@
-package com.sprint.mission.discodeit.entity.user.entity;
-
-
-import com.google.common.base.Preconditions;
-import jakarta.validation.constraints.NotNull;
-import jakarta.validation.constraints.Size;
-import java.io.Serial;
-import java.io.Serializable;
-import java.util.Objects;
-import lombok.Getter;
-
-@Getter
-public class UserName implements Serializable {
-
-    public static final int NAME_MIN_LENGTH = 3;
-    public static final int NAME_MAX_LENGTH = 20;
-    @Serial
-    private static final long serialVersionUID = 8759111145208252347L;
-
-    @Size(
-            min = NAME_MIN_LENGTH, max = NAME_MAX_LENGTH,
-            message = "'${validatedValue}' must be between {min} and {max} characters long"
-    )
-    @NotNull
-    private final String name;
-
-    public UserName(String name) {
-        this.name = name;
-    }
-
-    public static UserName createFrom(String username) {
-        Preconditions.checkNotNull(username);
-        return new UserName(username);
-    }
-
-    public UserName changeName(String name) {
-        Preconditions.checkNotNull(name);
-        return new UserName(name);
-    }
-
-    @Override
-    public String toString() {
-        return name;
-    }
-
-    @Override
-    public boolean equals(Object o) {
-        if (this == o) {
-            return true;
-        }
-        if (o == null || getClass() != o.getClass()) {
-            return false;
-        }
-        UserName userName = (UserName) o;
-        return Objects.equals(name, userName.name);
-    }
-
-
-    @Override
-    public int hashCode() {
-        return Objects.hashCode(name);
-    }
-
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/userstatus/UserStatus.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/userstatus/UserStatus.java
deleted file mode 100644
index c887a4689..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/entity/userstatus/UserStatus.java
+++ /dev/null
@@ -1,32 +0,0 @@
-package com.sprint.mission.discodeit.entity.userstatus;
-
-import com.sprint.mission.discodeit.entity.user.entity.User;
-import java.time.Instant;
-import java.time.temporal.ChronoUnit;
-import java.util.Objects;
-import java.util.UUID;
-import lombok.Getter;
-
-@Getter
-public class UserStatus {
-
-    private final UUID id;
-    private Instant createdAt;
-    private Instant updatedAt;
-    private final User user;
-
-    public UserStatus(User user) {
-        Objects.requireNonNull(user, "user is null");
-        this.id = UUID.randomUUID();
-        this.user = user;
-        this.createdAt = Instant.now();
-        this.updatedAt = Instant.now();
-    }
-    public void updateConnectTime() {
-        updatedAt = Instant.now();
-    }
-    public boolean isActiveWithInFiveMinutes() {
-        Instant withInFiveMin = Instant.now().minus(5, ChronoUnit.MINUTES);
-        return updatedAt.isAfter(withInFiveMin);
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorCode.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorCode.java
new file mode 100644
index 000000000..250ab4e6a
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorCode.java
@@ -0,0 +1,48 @@
+package com.sprint.mission.discodeit.global.error;
+
+public enum ErrorCode {
+
+
+    // User Domain
+    INVALID_USERNAME_LENGTH(400, "유저 이름은 1~32자 이내여야 합니다.", "U001"),
+    INVALID_NICKNAME_LENGTH(400, "유저 이름은 2~32자 이내여야 합니다.", "U002"),
+    INVALID_PASSWORD_LENGTH(400, "비밀번호는 8~20자 이내여야 합니다.", "U004"),  // 비밀번호 길이 오류
+    WEAK_PASSWORD(400, "비밀번호는 대문자, 숫자, 특수문자를 포함해야 합니다.", "U008"),
+
+    USERNAME_REQUIRED(400, "유저 이름은 필수입니다.", "U104"),
+    NICKNAME_REQUIRED(400, "닉네임은 필수입니다.", "U105"),
+    EMAIL_REQUIRED(400, "이메일은 필수입니다.", "U106"),
+    PASSWORD_REQUIRED(400, "비밀번호는 필수 입력값입니다.", "U107"),
+
+    INVALID_EMAIL_FORMAT(400, "이메일 형식이 올바르지 않습니다", "U203"),
+    INVALID_USERNAME_FORMAT(400, "유저 이름에 허용되지 않은 문자가 포함되어 있습니다.", "U205"),
+    INVALID_NICKNAME_FORMAT(400, "닉네임에 허용되지 않은 문자가 포함되어 있습니다.", "U206"),
+
+    DUPLICATE_EMAIL(400, "이미 사용중인 이메일입니다.", "U307"),
+    DUPLICATE_USERNAME(400, "이미 존재하는 유저이름입니다.", "U308"),
+
+
+    ;
+
+    private final int status;
+    private final String description;
+    private final String code;
+
+    ErrorCode(int status, String description, String code) {
+        this.status = status;
+        this.description = description;
+        this.code = code;
+    }
+
+    public int getStatus() {
+        return status;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public String getCode() {
+        return code;
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/exception/BusinessException.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/exception/BusinessException.java
new file mode 100644
index 000000000..cfe26b86e
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/exception/BusinessException.java
@@ -0,0 +1,20 @@
+package com.sprint.mission.discodeit.global.error.exception;
+
+import com.sprint.mission.discodeit.global.error.ErrorCode;
+import lombok.Getter;
+
+@Getter
+public class BusinessException extends RuntimeException {
+
+    protected final ErrorCode errorCode;
+
+    public BusinessException(ErrorCode errorCode) {
+        super(errorCode.getDescription());
+        this.errorCode = errorCode;
+    }
+
+    public BusinessException(ErrorCode errorCode, String message) {
+        super(errorCode.getDescription().concat(" 입력값 = ").concat(message));
+        this.errorCode = errorCode;
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/exception/EntityNotFoundException.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/exception/EntityNotFoundException.java
new file mode 100644
index 000000000..ec5c9bd20
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/exception/EntityNotFoundException.java
@@ -0,0 +1,10 @@
+package com.sprint.mission.discodeit.global.error.exception;
+
+import com.sprint.mission.discodeit.global.error.ErrorCode;
+
+public class EntityNotFoundException extends BusinessException {
+
+    public EntityNotFoundException(ErrorCode errorCode) {
+        super(errorCode);
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/exception/InvalidException.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/exception/InvalidException.java
new file mode 100644
index 000000000..7ffa192a1
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/exception/InvalidException.java
@@ -0,0 +1,10 @@
+package com.sprint.mission.discodeit.global.error.exception;
+
+import com.sprint.mission.discodeit.global.error.ErrorCode;
+
+public class InvalidException extends BusinessException {
+
+    public InvalidException(ErrorCode errorCode, String message) {
+        super(errorCode, message);
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/common/CrudRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/common/CrudRepository.java
deleted file mode 100644
index 0ac8f04f9..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/common/CrudRepository.java
+++ /dev/null
@@ -1,19 +0,0 @@
-package com.sprint.mission.discodeit.repository.common;
-
-import java.io.FileNotFoundException;
-import java.util.Optional;
-
-public interface CrudRepository<T, ID> extends Repository<T, ID> {
-
-    T save(T entity);
-
-    Optional<T> findById(ID id);
-
-    Iterable<T> findAll();
-
-    int count();
-
-    void deleteById(ID id);
-
-    boolean isExistsById(ID id);
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/common/InMemoryCrudRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/common/InMemoryCrudRepository.java
deleted file mode 100644
index ee9058ab0..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/common/InMemoryCrudRepository.java
+++ /dev/null
@@ -1,58 +0,0 @@
-package com.sprint.mission.discodeit.repository.common;
-
-import com.sprint.mission.discodeit.entity.common.BaseEntity;
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.Objects;
-import java.util.Optional;
-import java.util.UUID;
-
-public abstract class InMemoryCrudRepository<T extends BaseEntity, ID extends UUID>
-        implements CrudRepository<T, ID> {
-
-    protected final Map<UUID, T> store = new HashMap<>();
-
-    @Override
-    public final T save(T entity) {
-        var id = Objects.requireNonNull(entity.getId());
-        store.put(id, entity);
-        return entity;
-    }
-
-    @Override
-    public Optional<T> findById(ID id) {
-        var findEntity = store.get(id);
-        return Optional.ofNullable(findEntity);
-    }
-
-    @Override
-    public List<T> findAll() {
-        if (store.isEmpty()) {
-            return Collections.emptyList();
-        }
-        
-        var existEntities = store.values()
-                .stream()
-                .toList();
-
-        return Collections.unmodifiableList(existEntities);
-    }
-
-    @Override
-    public int count() {
-        return store.size();
-    }
-
-    @Override
-    public void deleteById(ID id) {
-        store.remove(id);
-    }
-
-    @Override
-    public boolean isExistsById(ID id) {
-        var isExist = store.containsKey(id);
-        return isExist;
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/common/Repository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/common/Repository.java
deleted file mode 100644
index dc48a9ae8..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/common/Repository.java
+++ /dev/null
@@ -1,4 +0,0 @@
-package com.sprint.mission.discodeit.repository.common;
-
-public interface Repository<T, ID> {
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/FileAbstractRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/FileAbstractRepository.java
deleted file mode 100644
index 7de412af8..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/FileAbstractRepository.java
+++ /dev/null
@@ -1,60 +0,0 @@
-package com.sprint.mission.discodeit.repository.file;
-
-import com.sprint.mission.discodeit.entity.common.BaseEntity;
-import com.sprint.mission.discodeit.repository.common.InMemoryCrudRepository;
-import java.io.File;
-import java.io.FileInputStream;
-import java.io.FileOutputStream;
-import java.io.IOException;
-import java.io.ObjectInputStream;
-import java.io.ObjectOutputStream;
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.Map;
-import java.util.UUID;
-
-public abstract class FileAbstractRepository<T extends BaseEntity, ID extends UUID>
-        extends InMemoryCrudRepository<T, ID> {
-
-    private final File file;
-
-    protected FileAbstractRepository(String filePath) {
-        file = new File(filePath);
-    }
-
-    protected Map<UUID, T> loadFile() {
-        if (!file.exists()) {
-            return Collections.emptyMap();
-        }
-
-        Map<UUID, T> store = new HashMap<>();
-        try (
-                FileInputStream fis = new FileInputStream(file);
-                ObjectInputStream ois = new ObjectInputStream(fis);
-        ) {
-            try {
-                store = (Map<UUID, T>) ois.readObject();
-            } catch (ClassNotFoundException e) {
-                System.out.println(e.getMessage());
-            }
-        } catch (IOException e) {
-            System.out.println("loading exit");
-            throw new IllegalArgumentException();
-        }
-        return store;
-    }
-
-
-    public void saveToFile() {
-        try (
-                FileOutputStream fos = new FileOutputStream(file);
-                ObjectOutputStream oos = new ObjectOutputStream(fos);
-        ) {
-            oos.writeObject(store);
-        } catch (IOException e) {
-            throw new RuntimeException(e);
-        }
-    }
-
-}
-
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/channel/FileChannelRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/channel/FileChannelRepository.java
deleted file mode 100644
index 5995be58a..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/channel/FileChannelRepository.java
+++ /dev/null
@@ -1,26 +0,0 @@
-package com.sprint.mission.discodeit.repository.file.channel;
-
-import com.sprint.mission.discodeit.entity.channel.Channel;
-import com.sprint.mission.discodeit.repository.jcf.channel.ChannelRepository;
-import com.sprint.mission.discodeit.repository.file.FileAbstractRepository;
-import java.util.UUID;
-import org.springframework.stereotype.Component;
-import org.springframework.stereotype.Repository;
-
-@Repository
-public class FileChannelRepository extends FileAbstractRepository<Channel, UUID> implements ChannelRepository {
-    private static final String CHANNEL_FILE_PATH_NAME = "temp/file/channel/channel.ser";
-    private static ChannelRepository FILE_USER_REPOSITORY_INSTANCE;
-
-    protected FileChannelRepository() {
-        super(CHANNEL_FILE_PATH_NAME);
-        store.putAll(loadFile());
-    }
-
-    public static ChannelRepository getInstance() {
-        if (FILE_USER_REPOSITORY_INSTANCE == null) {
-            FILE_USER_REPOSITORY_INSTANCE = new FileChannelRepository();
-        }
-        return FILE_USER_REPOSITORY_INSTANCE;
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/message/FileChannelMessageRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/message/FileChannelMessageRepository.java
deleted file mode 100644
index 55ca813c2..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/message/FileChannelMessageRepository.java
+++ /dev/null
@@ -1,29 +0,0 @@
-package com.sprint.mission.discodeit.repository.file.message;
-
-import com.sprint.mission.discodeit.entity.message.ChannelMessage;
-import com.sprint.mission.discodeit.repository.file.FileAbstractRepository;
-import com.sprint.mission.discodeit.repository.jcf.message.ChannelMessage.ChannelMessageRepository;
-import java.util.UUID;
-import org.springframework.stereotype.Repository;
-
-@Repository
-public class FileChannelMessageRepository extends FileAbstractRepository<ChannelMessage, UUID>
-        implements ChannelMessageRepository {
-
-    private static final String CHANNEL_MESSAGE_FILE_PATH_NAME = "temp/file/user/channelMessage.ser";
-    private static ChannelMessageRepository INSTANCE;
-
-
-    protected FileChannelMessageRepository() {
-        super(CHANNEL_MESSAGE_FILE_PATH_NAME);
-        store.putAll(loadFile());
-    }
-
-    public static ChannelMessageRepository getInstance() {
-        if (INSTANCE == null) {
-            INSTANCE = new FileChannelMessageRepository();
-        }
-        return INSTANCE;
-    }
-
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/message/FileDirectMessageRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/message/FileDirectMessageRepository.java
deleted file mode 100644
index 68db4315a..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/message/FileDirectMessageRepository.java
+++ /dev/null
@@ -1,26 +0,0 @@
-package com.sprint.mission.discodeit.repository.file.message;
-
-import com.sprint.mission.discodeit.entity.message.DirectMessage;
-import com.sprint.mission.discodeit.repository.file.FileAbstractRepository;
-import com.sprint.mission.discodeit.repository.jcf.message.directMessage.DirectMessageRepository;
-import java.util.UUID;
-import org.springframework.stereotype.Repository;
-
-@Repository
-public class FileDirectMessageRepository extends FileAbstractRepository<DirectMessage, UUID> implements
-        DirectMessageRepository {
-    private static final String DIRECT_MESSAGE_FILE_PATH_NAME = "temp/file/message/directmessage.ser";
-    private static FileDirectMessageRepository FILE_DIRECT_REPOSITORY_INSTANCE;
-
-    protected FileDirectMessageRepository() {
-        super(DIRECT_MESSAGE_FILE_PATH_NAME);
-        store.putAll(loadFile());
-    }
-
-    public static DirectMessageRepository getInstance() {
-        if (FILE_DIRECT_REPOSITORY_INSTANCE == null) {
-            FILE_DIRECT_REPOSITORY_INSTANCE = new FileDirectMessageRepository();
-        }
-        return FILE_DIRECT_REPOSITORY_INSTANCE;
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/user/FileUserRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/user/FileUserRepository.java
deleted file mode 100644
index 3d7677e13..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/file/user/FileUserRepository.java
+++ /dev/null
@@ -1,36 +0,0 @@
-package com.sprint.mission.discodeit.repository.file.user;
-
-import com.sprint.mission.discodeit.entity.user.entity.User;
-import com.sprint.mission.discodeit.repository.file.FileAbstractRepository;
-import com.sprint.mission.discodeit.repository.jcf.user.UserRepository;
-import java.util.Optional;
-import java.util.UUID;
-import org.springframework.stereotype.Repository;
-
-@Repository
-public class FileUserRepository extends FileAbstractRepository<User, UUID> implements UserRepository {
-    private static final String FILE_PATH_USER_NAME = "temp/file/user/user.ser";
-    private static UserRepository FILE_USER_REPOSITORY_INSTANCE;
-
-    private FileUserRepository() {
-        super(FILE_PATH_USER_NAME);
-        store.putAll(loadFile());
-    }
-
-    public static UserRepository getInstance() {
-        if (FILE_USER_REPOSITORY_INSTANCE == null) {
-            FILE_USER_REPOSITORY_INSTANCE = new FileUserRepository();
-        }
-        return FILE_USER_REPOSITORY_INSTANCE;
-    }
-
-    @Override
-    public Optional<User> findByUsername(String username) {
-        var findUser = findAll().stream()
-                .filter(user -> username.equals(user.getName()))
-                .findFirst();
-
-        return findUser;
-    }
-
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/channel/ChannelRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/channel/ChannelRepository.java
deleted file mode 100644
index 1a5bbc5fc..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/channel/ChannelRepository.java
+++ /dev/null
@@ -1,9 +0,0 @@
-package com.sprint.mission.discodeit.repository.jcf.channel;
-
-import com.sprint.mission.discodeit.repository.common.CrudRepository;
-import com.sprint.mission.discodeit.entity.channel.Channel;
-import java.util.UUID;
-
-public interface ChannelRepository extends CrudRepository<Channel, UUID> {
-
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/channel/JCFChannelRepositoryInMemory.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/channel/JCFChannelRepositoryInMemory.java
deleted file mode 100644
index 68faf6f8e..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/channel/JCFChannelRepositoryInMemory.java
+++ /dev/null
@@ -1,15 +0,0 @@
-package com.sprint.mission.discodeit.repository.jcf.channel;
-
-import com.sprint.mission.discodeit.repository.common.InMemoryCrudRepository;
-import com.sprint.mission.discodeit.entity.channel.Channel;
-import java.util.UUID;
-
-public class JCFChannelRepositoryInMemory extends InMemoryCrudRepository<Channel, UUID> implements ChannelRepository  {
-    private JCFChannelRepositoryInMemory() {}
-
-    public static ChannelRepository getChannelRepositoryInMemory() {
-        return new JCFChannelRepositoryInMemory();
-    }
-
-
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/message/ChannelMessage/ChannelMessageRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/message/ChannelMessage/ChannelMessageRepository.java
deleted file mode 100644
index b78ce6471..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/message/ChannelMessage/ChannelMessageRepository.java
+++ /dev/null
@@ -1,8 +0,0 @@
-package com.sprint.mission.discodeit.repository.jcf.message.ChannelMessage;
-
-import com.sprint.mission.discodeit.repository.common.CrudRepository;
-import com.sprint.mission.discodeit.entity.message.ChannelMessage;
-import java.util.UUID;
-
-public interface ChannelMessageRepository extends CrudRepository<ChannelMessage, UUID> {
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/message/ChannelMessage/JCFChannelMessageRepositoryInMemory.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/message/ChannelMessage/JCFChannelMessageRepositoryInMemory.java
deleted file mode 100644
index e6559940a..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/message/ChannelMessage/JCFChannelMessageRepositoryInMemory.java
+++ /dev/null
@@ -1,14 +0,0 @@
-package com.sprint.mission.discodeit.repository.jcf.message.ChannelMessage;
-
-import com.sprint.mission.discodeit.repository.common.InMemoryCrudRepository;
-import com.sprint.mission.discodeit.entity.message.ChannelMessage;
-import java.util.UUID;
-
-public class JCFChannelMessageRepositoryInMemory extends InMemoryCrudRepository<ChannelMessage, UUID> implements ChannelMessageRepository {
-
-    private JCFChannelMessageRepositoryInMemory() {}
-
-    public static JCFChannelMessageRepositoryInMemory getInstance() {
-        return new JCFChannelMessageRepositoryInMemory();
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/message/directMessage/DirectMessageRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/message/directMessage/DirectMessageRepository.java
deleted file mode 100644
index 9cbd28670..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/message/directMessage/DirectMessageRepository.java
+++ /dev/null
@@ -1,9 +0,0 @@
-package com.sprint.mission.discodeit.repository.jcf.message.directMessage;
-
-import com.sprint.mission.discodeit.repository.common.CrudRepository;
-import com.sprint.mission.discodeit.entity.message.DirectMessage;
-import java.util.UUID;
-
-public interface DirectMessageRepository extends CrudRepository<DirectMessage, UUID> {
-
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/message/directMessage/JCFDirectMessageRepositoryInMemory.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/message/directMessage/JCFDirectMessageRepositoryInMemory.java
deleted file mode 100644
index 6144a3735..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/message/directMessage/JCFDirectMessageRepositoryInMemory.java
+++ /dev/null
@@ -1,16 +0,0 @@
-package com.sprint.mission.discodeit.repository.jcf.message.directMessage;
-
-import com.sprint.mission.discodeit.repository.common.InMemoryCrudRepository;
-import com.sprint.mission.discodeit.entity.message.DirectMessage;
-import java.util.UUID;
-
-public class JCFDirectMessageRepositoryInMemory extends InMemoryCrudRepository<DirectMessage, UUID>
-        implements DirectMessageRepository {
-
-    private JCFDirectMessageRepositoryInMemory() {}
-
-    public static JCFDirectMessageRepositoryInMemory getInstance() {
-        return new JCFDirectMessageRepositoryInMemory();
-    }
-
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/user/JCFUserRepositoryInMemory.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/user/JCFUserRepositoryInMemory.java
deleted file mode 100644
index d64751eac..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/user/JCFUserRepositoryInMemory.java
+++ /dev/null
@@ -1,35 +0,0 @@
-package com.sprint.mission.discodeit.repository.jcf.user;
-
-import com.sprint.mission.discodeit.repository.common.InMemoryCrudRepository;
-import com.sprint.mission.discodeit.entity.user.entity.User;
-import java.util.Optional;
-import java.util.UUID;
-
-public class JCFUserRepositoryInMemory extends InMemoryCrudRepository<User, UUID> implements UserRepository {
-
-    private static UserRepository INSTANCE;
-
-    private JCFUserRepositoryInMemory() {}
-
-    @Override
-    public Optional<User> findByUsername(String username) {
-        var findUser = findAll().stream()
-                .filter(user -> username.equals(user.getNicknameValue()))
-                .findFirst();
-
-        return findUser;
-    }
-
-
-    public static UserRepository getInstance() {
-        if (INSTANCE == null) {
-            INSTANCE = new JCFUserRepositoryInMemory();
-        }
-
-        return INSTANCE;
-    }
-
-    public static UserRepository getUserRepositoryInMemory() {
-        return new JCFUserRepositoryInMemory();
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/user/UserRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/user/UserRepository.java
deleted file mode 100644
index 4f22cf196..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/jcf/user/UserRepository.java
+++ /dev/null
@@ -1,16 +0,0 @@
-package com.sprint.mission.discodeit.repository.jcf.user;
-
-import com.sprint.mission.discodeit.repository.common.CrudRepository;
-import com.sprint.mission.discodeit.entity.user.entity.User;
-import java.util.Optional;
-import java.util.UUID;
-
-public interface UserRepository extends CrudRepository<User, UUID> {
-
-    Optional<User> findByUsername(String username);
-
-    public static UserRepository getInMemoryUserRepositoryImpl() {
-        return JCFUserRepositoryInMemory.getInstance();
-    }
-
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/basic/BasicChannelMessageService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/basic/BasicChannelMessageService.java
deleted file mode 100644
index 276a0c165..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/basic/BasicChannelMessageService.java
+++ /dev/null
@@ -1,85 +0,0 @@
-package com.sprint.mission.discodeit.service.basic;
-
-import com.sprint.mission.discodeit.common.error.ErrorMessage;
-import com.sprint.mission.discodeit.common.error.channel.ChannelException;
-import com.sprint.mission.discodeit.common.error.user.UserException;
-import com.sprint.mission.discodeit.entity.channel.Channel;
-import com.sprint.mission.discodeit.entity.message.ChannelMessage;
-import com.sprint.mission.discodeit.entity.message.dto.ChannelMessageInfoResponse;
-import com.sprint.mission.discodeit.entity.message.dto.SendChannelMessageRequest;
-import com.sprint.mission.discodeit.entity.user.entity.User;
-import com.sprint.mission.discodeit.repository.jcf.channel.ChannelRepository;
-import com.sprint.mission.discodeit.repository.jcf.message.ChannelMessage.ChannelMessageRepository;
-import com.sprint.mission.discodeit.repository.jcf.user.UserRepository;
-import com.sprint.mission.discodeit.service.message.channelMessage.ChannelMessageService;
-import com.sprint.mission.discodeit.service.message.converter.ChannelMessageConverter;
-import java.util.UUID;
-import lombok.RequiredArgsConstructor;
-import org.springframework.stereotype.Service;
-
-@Service
-@RequiredArgsConstructor
-public class BasicChannelMessageService implements ChannelMessageService {
-
-    private final UserRepository userRepository;
-    private final ChannelRepository channelRepository;
-    private final ChannelMessageRepository channelMessageRepository;
-    private final ChannelMessageConverter converter;
-
-    public static ChannelMessageService getInstance(
-            UserRepository userRepository,
-            ChannelRepository channelRepository,
-            ChannelMessageRepository channelMessageRepository
-    ) {
-        var converter = new ChannelMessageConverter();
-        return new BasicChannelMessageService(userRepository, channelRepository, channelMessageRepository, converter);
-    }
-
-    @Override
-    public ChannelMessageInfoResponse sendMessage(SendChannelMessageRequest sendChannelMessageRequest) {
-        // 유저 찾기
-        var foundUser = findUserByIdOrThrow(sendChannelMessageRequest.sendUserId());
-        // 채널 찾기
-        var foundChannel = findChannelByIdOrThrow(sendChannelMessageRequest.receiveChannelId());
-        // 메시지 생성
-        var channelMessage = ChannelMessage.ofMessageAndSenderAndReceiverChannel(
-                sendChannelMessageRequest.message(),
-                foundUser,
-                foundChannel
-        );
-        // 메시지 저장
-        var savedMessage = channelMessageRepository.save(channelMessage);
-        // 메시지 전송
-        savedMessage.sendMessage();
-        // 생성된 메시지 반환
-        return converter.toDto(savedMessage);
-    }
-
-    /**
-     * ==> 코드리뷰 부탁드립니다. 유저 서비스에 다른 서비스에서 이용하기 위한 메서드를 넣는게 바람직한가요?
-     * ==> 제 생각은, 유저 서비스에 같은 기능으로 호출하는 기능이 필요하다면 추가하지만, 없다면 안넣는게 낫다고 생각함. 넣는다면 userRepository
-     *      그런데, 유저 서비스에서 id로만 찾는 유저를 찾는 기능이 있는가? 구현한 내용은 유저 서비스 레이어 안에서만 private 구현
-     *      코드 중복이 너무 많이 발생함, 이를 해결하기 위해 userService, userRepository 둘 중 하나에 메서드를 만드는 방법 중 어디가 좋을까요?
-     *
-     * ==> 다른 서비스 레이어를 의존하도록 해서 호출해도 괜찮을까요 ?
-     */
-    private User findUserByIdOrThrow(UUID userId) {
-        var foundUser = userRepository.findById(userId)
-                .filter(User::isNotUnregistered)
-                .orElseThrow(() -> UserException.ofErrorMessageAndId(
-                        ErrorMessage.USER_NOT_FOUND, userId.toString()
-                ));
-
-        return foundUser;
-    }
-
-
-    private Channel findChannelByIdOrThrow(UUID channelId) {
-        var foundChannel = channelRepository.findById(channelId)
-                .orElseThrow(() -> ChannelException.ofErrorMessageAndNotExistChannelId(
-                        ErrorMessage.CHANNEL_NOT_FOUND,
-                        channelId
-                ));
-        return foundChannel;
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/basic/BasicChannelService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/basic/BasicChannelService.java
deleted file mode 100644
index 80095c8bd..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/basic/BasicChannelService.java
+++ /dev/null
@@ -1,81 +0,0 @@
-package com.sprint.mission.discodeit.service.basic;
-
-import static com.sprint.mission.discodeit.common.error.ErrorMessage.CHANNEL_NOT_FOUND;
-import static com.sprint.mission.discodeit.common.error.ErrorMessage.USER_NOT_FOUND;
-
-import com.sprint.mission.discodeit.common.error.channel.ChannelException;
-import com.sprint.mission.discodeit.common.error.user.UserException;
-import com.sprint.mission.discodeit.entity.channel.dto.ChangeChannelNameRequest;
-import com.sprint.mission.discodeit.entity.channel.dto.ChannelResponse;
-import com.sprint.mission.discodeit.entity.channel.dto.CreateNewChannelRequest;
-import com.sprint.mission.discodeit.entity.channel.dto.DeleteChannelRequest;
-import com.sprint.mission.discodeit.entity.user.entity.User;
-import com.sprint.mission.discodeit.repository.jcf.channel.ChannelRepository;
-import com.sprint.mission.discodeit.repository.jcf.user.UserRepository;
-import com.sprint.mission.discodeit.service.channel.ChannelConverter;
-import com.sprint.mission.discodeit.service.channel.ChannelService;
-import java.util.UUID;
-import lombok.RequiredArgsConstructor;
-import org.springframework.stereotype.Service;
-
-@Service
-@RequiredArgsConstructor
-public class BasicChannelService implements ChannelService {
-
-    private final ChannelRepository channelRepository;
-    private final UserRepository userRepository;
-    private final ChannelConverter channelConverter;
-
-    public static ChannelService getInstance(UserRepository userRepository, ChannelRepository channelRepository) {
-        return new BasicChannelService(channelRepository, userRepository, new ChannelConverter());
-    }
-
-    @Override
-    public ChannelResponse createChannelOrThrow(CreateNewChannelRequest request) {
-        /**
-         * ==> 코드리뷰 : 메서드 내부에 다른 메서드를 호출하면서 throw가 발생가능하다는 것을 코드 블록의 메서드의 이름에 추가해야할까요?
-         * createChannel VS createChannelOrThrow
-         */
-        var findUser = findUserByIdOrThrow(request.userId());
-
-        var createdChannel = findUser.openNewChannel(request.channelName());
-
-        channelRepository.save(createdChannel);
-        userRepository.save(findUser);
-
-        return channelConverter.toDto(createdChannel);
-    }
-
-    @Override
-    public void changeChannelNameOrThrow(ChangeChannelNameRequest request) {
-        var foundUser = findUserByIdOrThrow(request.userId());
-
-        var changedChannel = foundUser.changeChannelName(request.channelId(), request.newChannelName());
-
-        channelRepository.save(changedChannel);
-        userRepository.save(foundUser);
-    }
-
-    @Override
-    public void deleteChannelByChannelIdOrThrow(DeleteChannelRequest request) {
-        var foundChannel = channelRepository.findById(request.channelId())
-                .orElseThrow(
-                        () -> ChannelException.ofErrorMessageAndNotExistChannelId(
-                                CHANNEL_NOT_FOUND,
-                                request.channelId())
-                );
-
-        var foundUser = findUserByIdOrThrow(request.userId());
-        foundChannel.deleteChannel(foundUser);
-
-        channelRepository.save(foundChannel);
-    }
-
-    private User findUserByIdOrThrow(UUID id) {
-        var foundUser = userRepository.findById(id)
-                .filter(User::isNotUnregistered)
-                .orElseThrow(() -> UserException.of(USER_NOT_FOUND));
-
-        return foundUser;
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/basic/BasicDirectMessageService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/basic/BasicDirectMessageService.java
deleted file mode 100644
index 4d1507865..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/basic/BasicDirectMessageService.java
+++ /dev/null
@@ -1,61 +0,0 @@
-package com.sprint.mission.discodeit.service.basic;
-
-import com.sprint.mission.discodeit.common.error.ErrorMessage;
-import com.sprint.mission.discodeit.common.error.user.UserException;
-import com.sprint.mission.discodeit.entity.message.DirectMessage;
-import com.sprint.mission.discodeit.entity.message.dto.DirectMessageInfoResponse;
-import com.sprint.mission.discodeit.entity.message.dto.SendDirectMessageRequest;
-import com.sprint.mission.discodeit.entity.user.entity.User;
-import com.sprint.mission.discodeit.repository.jcf.message.directMessage.DirectMessageRepository;
-import com.sprint.mission.discodeit.repository.jcf.user.UserRepository;
-import com.sprint.mission.discodeit.service.message.converter.DirectMessageConverter;
-import com.sprint.mission.discodeit.service.message.directMessage.DirectMessageService;
-import java.util.UUID;
-import lombok.RequiredArgsConstructor;
-import org.springframework.stereotype.Service;
-
-@Service
-@RequiredArgsConstructor
-public class BasicDirectMessageService implements DirectMessageService {
-
-    private final DirectMessageRepository directMessageRepository;
-    private final UserRepository userRepository;
-    private final DirectMessageConverter directMessageConverter;
-
-    public static DirectMessageService getInstance(
-            DirectMessageRepository directMessageRepository,
-            UserRepository userRepository
-    ) {
-        var converter = new DirectMessageConverter();
-        return new BasicDirectMessageService(directMessageRepository, userRepository, converter);
-    }
-
-    @Override
-    public DirectMessageInfoResponse sendMessage(SendDirectMessageRequest sendDirectMessageRequest) {
-
-        var foundSendUser = findUserByIdOrThrow(sendDirectMessageRequest.sendUserId());
-        var foundReceiverUser = findUserByIdOrThrow(sendDirectMessageRequest.receiveUserId());
-
-        var createdDirectMessage = DirectMessage.ofMessageAndSenderReceiver(
-                sendDirectMessageRequest.message(),
-                foundSendUser,
-                foundReceiverUser
-        );
-
-        var savedDirectMessage = directMessageRepository.save(createdDirectMessage);
-
-        createdDirectMessage.sendMessage();
-
-        return directMessageConverter.toDto(savedDirectMessage);
-    }
-
-    private User findUserByIdOrThrow(UUID userId) {
-        var foundUser = userRepository.findById(userId)
-                .filter(User::isNotUnregistered)
-                .orElseThrow(() -> UserException.ofErrorMessageAndId(
-                        ErrorMessage.USER_NOT_FOUND, userId.toString()
-                ));
-
-        return foundUser;
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/basic/BasicUserService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/basic/BasicUserService.java
deleted file mode 100644
index c4370364b..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/basic/BasicUserService.java
+++ /dev/null
@@ -1,82 +0,0 @@
-package com.sprint.mission.discodeit.service.basic;
-
-import static com.sprint.mission.discodeit.common.error.ErrorMessage.USER_NOT_FOUND;
-
-import com.sprint.mission.discodeit.common.error.user.UserException;
-import com.sprint.mission.discodeit.entity.user.dto.ExitChannelRequest;
-import com.sprint.mission.discodeit.entity.user.dto.FindUserRequest;
-import com.sprint.mission.discodeit.entity.user.dto.ModifyUserInfoRequest;
-import com.sprint.mission.discodeit.entity.user.dto.RegisterUserRequest;
-import com.sprint.mission.discodeit.entity.user.dto.UnregisterUserRequest;
-import com.sprint.mission.discodeit.entity.user.dto.UserInfoResponse;
-import com.sprint.mission.discodeit.entity.user.entity.User;
-import com.sprint.mission.discodeit.repository.jcf.user.UserRepository;
-import com.sprint.mission.discodeit.service.user.UserConverter;
-import com.sprint.mission.discodeit.service.user.UserService;
-import java.util.UUID;
-import lombok.RequiredArgsConstructor;
-import org.springframework.stereotype.Service;
-
-@Service
-@RequiredArgsConstructor
-public class BasicUserService implements UserService {
-
-    private final UserRepository userRepository;
-    private final UserConverter converter;
-
-    @Override
-    public UserInfoResponse register(RegisterUserRequest registerUserRequest) {
-        var entity = converter.toEntity(registerUserRequest);
-        var savedEntity = userRepository.save(entity);
-
-        return converter.toDto(savedEntity);
-    }
-
-    @Override
-    public UserInfoResponse findUserByUsernameOrThrow(FindUserRequest findUserRequest) {
-        var foundUser = userRepository.findByUsername(findUserRequest.username())
-                .filter(User::isNotUnregistered)
-                .map(converter::toDto)
-                .orElseThrow(() -> UserException.of(USER_NOT_FOUND));
-
-        return foundUser;
-    }
-
-    @Override
-    public UserInfoResponse modifyUserInfo(ModifyUserInfoRequest request) {
-        var foundUser = findByUserIdOrThrow(request.id());
-
-        foundUser.changeUserName(request.changeUsername());
-        userRepository.save(foundUser);
-
-        var response = converter.toDto(foundUser);
-        return response;
-    }
-
-    @Override
-    public void UnRegisterUser(UnregisterUserRequest request) {
-        var foundUser = findByUserIdOrThrow(request.id());
-
-        foundUser.unregister();
-
-        userRepository.save(foundUser);
-    }
-
-    @Override
-    public void exitChannel(ExitChannelRequest request) {
-        var foundUser = findByUserIdOrThrow(request.userId());
-        foundUser.exitParticipatedChannel(request.channelId());
-        userRepository.save(foundUser);
-    }
-
-    private User findByUserIdOrThrow(UUID id) {
-        var entity = userRepository.findById(id)
-                .filter(User::isNotUnregistered)
-                .orElseThrow(() -> UserException.of(USER_NOT_FOUND));
-        return entity;
-    }
-
-    public static BasicUserService getInstance(UserRepository userRepository) {
-        return new BasicUserService(userRepository, new UserConverter());
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/channel/ChannelConverter.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/channel/ChannelConverter.java
deleted file mode 100644
index 31a0307d1..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/channel/ChannelConverter.java
+++ /dev/null
@@ -1,21 +0,0 @@
-package com.sprint.mission.discodeit.service.channel;
-
-import com.sprint.mission.discodeit.entity.channel.Channel;
-import com.sprint.mission.discodeit.entity.channel.dto.ChannelResponse;
-import com.sprint.mission.discodeit.entity.channel.dto.ChannelResponse.Builder;
-import org.springframework.stereotype.Component;
-
-@Component
-public class ChannelConverter {
-
-    public ChannelResponse toDto(Channel channel) {
-        var channelResponse = new Builder()
-                .channelId(channel.getId())
-                .channelName(channel.getChannelName())
-                .creator(channel.getCreatorName())
-                .status(channel.getStatus().getStatus())
-                .build();
-
-        return channelResponse;
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/channel/ChannelService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/channel/ChannelService.java
deleted file mode 100644
index 5a79aa1c6..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/channel/ChannelService.java
+++ /dev/null
@@ -1,14 +0,0 @@
-package com.sprint.mission.discodeit.service.channel;
-
-import com.sprint.mission.discodeit.entity.channel.dto.ChangeChannelNameRequest;
-import com.sprint.mission.discodeit.entity.channel.dto.ChannelResponse;
-import com.sprint.mission.discodeit.entity.channel.dto.CreateNewChannelRequest;
-import com.sprint.mission.discodeit.entity.channel.dto.DeleteChannelRequest;
-
-public interface ChannelService {
-    ChannelResponse createChannelOrThrow(CreateNewChannelRequest request);
-
-    void changeChannelNameOrThrow(ChangeChannelNameRequest request);
-
-    void deleteChannelByChannelIdOrThrow(DeleteChannelRequest request);
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFChannelMessageService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFChannelMessageService.java
deleted file mode 100644
index 684f6cd29..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFChannelMessageService.java
+++ /dev/null
@@ -1,93 +0,0 @@
-package com.sprint.mission.discodeit.service.jcf;
-
-import com.sprint.mission.discodeit.common.error.ErrorMessage;
-import com.sprint.mission.discodeit.common.error.channel.ChannelException;
-import com.sprint.mission.discodeit.common.error.user.UserException;
-import com.sprint.mission.discodeit.repository.jcf.channel.ChannelRepository;
-import com.sprint.mission.discodeit.repository.jcf.message.ChannelMessage.ChannelMessageRepository;
-import com.sprint.mission.discodeit.repository.jcf.user.UserRepository;
-import com.sprint.mission.discodeit.entity.channel.Channel;
-import com.sprint.mission.discodeit.entity.message.ChannelMessage;
-import com.sprint.mission.discodeit.entity.message.dto.ChannelMessageInfoResponse;
-import com.sprint.mission.discodeit.entity.message.dto.SendChannelMessageRequest;
-import com.sprint.mission.discodeit.entity.user.entity.User;
-import com.sprint.mission.discodeit.service.message.channelMessage.ChannelMessageService;
-import com.sprint.mission.discodeit.service.message.converter.ChannelMessageConverter;
-import java.util.UUID;
-
-public class JCFChannelMessageService implements ChannelMessageService {
-
-    private final UserRepository userRepository;
-    private final ChannelRepository channelRepository;
-    private final ChannelMessageRepository channelMessageRepository;
-    private final ChannelMessageConverter converter;
-
-    private JCFChannelMessageService(
-            UserRepository userRepository,
-            ChannelRepository channelRepository,
-            ChannelMessageRepository channelMessageRepository,
-            ChannelMessageConverter converter
-    ) {
-        this.userRepository = userRepository;
-        this.channelRepository = channelRepository;
-        this.channelMessageRepository = channelMessageRepository;
-        this.converter = converter;
-    }
-
-    public static ChannelMessageService getInstance(
-            UserRepository userRepository,
-            ChannelRepository channelRepository,
-            ChannelMessageRepository channelMessageRepository
-    ) {
-        var converter = new ChannelMessageConverter();
-        return new JCFChannelMessageService(userRepository, channelRepository, channelMessageRepository, converter);
-    }
-
-    @Override
-    public ChannelMessageInfoResponse sendMessage(SendChannelMessageRequest sendChannelMessageRequest) {
-        // 유저 찾기
-        var foundUser = findUserByIdOrThrow(sendChannelMessageRequest.sendUserId());
-        // 채널 찾기
-        var foundChannel = findChannelByIdOrThrow(sendChannelMessageRequest.receiveChannelId());
-        // 메시지 생성
-        var channelMessage = ChannelMessage.ofMessageAndSenderAndReceiverChannel(
-                sendChannelMessageRequest.message(),
-                foundUser,
-                foundChannel
-        );
-        // 메시지 저장
-        var savedMessage = channelMessageRepository.save(channelMessage);
-        // 메시지 전송
-        savedMessage.sendMessage();
-        // 생성된 메시지 반환
-        return converter.toDto(savedMessage);
-    }
-
-    /**
-     * ==> 코드리뷰 부탁드립니다. 유저 서비스에 다른 서비스에서 이용하기 위한 메서드를 넣는게 바람직한가요?
-     * ==> 제 생각은, 유저 서비스에 같은 기능으로 호출하는 기능이 필요하다면 추가하지만, 없다면 안넣는게 낫다고 생각함. 넣는다면 userRepository
-     *      그런데, 유저 서비스에서 id로만 찾는 유저를 찾는 기능이 있는가? 구현한 내용은 유저 서비스 레이어 안에서만 private 구현
-     *      코드 중복이 너무 많이 발생함, 이를 해결하기 위해 userService, userRepository 둘 중 하나에 메서드를 만드는 방법 중 어디가 좋을까요?
-     *
-     * ==> 다른 서비스 레이어를 의존하도록 해서 호출해도 괜찮을까요 ?
-     */
-    private User findUserByIdOrThrow(UUID userId) {
-        var foundUser = userRepository.findById(userId)
-                .filter(User::isNotUnregistered)
-                .orElseThrow(() -> UserException.ofErrorMessageAndId(
-                        ErrorMessage.USER_NOT_FOUND, userId.toString()
-                ));
-
-        return foundUser;
-    }
-
-
-    private Channel findChannelByIdOrThrow(UUID channelId) {
-        var foundChannel = channelRepository.findById(channelId)
-                .orElseThrow(() -> ChannelException.ofErrorMessageAndNotExistChannelId(
-                        ErrorMessage.CHANNEL_NOT_FOUND,
-                        channelId
-                ));
-        return foundChannel;
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFChannelService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFChannelService.java
deleted file mode 100644
index 68e9f8c01..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFChannelService.java
+++ /dev/null
@@ -1,87 +0,0 @@
-package com.sprint.mission.discodeit.service.jcf;
-
-import static com.sprint.mission.discodeit.common.error.ErrorMessage.CHANNEL_NOT_FOUND;
-import static com.sprint.mission.discodeit.common.error.ErrorMessage.USER_NOT_FOUND;
-
-import com.sprint.mission.discodeit.common.error.channel.ChannelException;
-import com.sprint.mission.discodeit.common.error.user.UserException;
-import com.sprint.mission.discodeit.repository.jcf.channel.ChannelRepository;
-import com.sprint.mission.discodeit.repository.jcf.user.UserRepository;
-import com.sprint.mission.discodeit.entity.channel.dto.ChangeChannelNameRequest;
-import com.sprint.mission.discodeit.entity.channel.dto.ChannelResponse;
-import com.sprint.mission.discodeit.entity.channel.dto.CreateNewChannelRequest;
-import com.sprint.mission.discodeit.entity.channel.dto.DeleteChannelRequest;
-import com.sprint.mission.discodeit.entity.user.entity.User;
-import com.sprint.mission.discodeit.service.channel.ChannelConverter;
-import com.sprint.mission.discodeit.service.channel.ChannelService;
-import java.util.UUID;
-
-public class JCFChannelService implements ChannelService {
-
-    private final ChannelRepository channelRepository;
-    private final UserRepository userRepository;
-    private final ChannelConverter channelConverter;
-
-    private JCFChannelService(
-            ChannelRepository channelRepository,
-            UserRepository userRepository,
-            ChannelConverter channelConverter
-    ) {
-        this.channelRepository = channelRepository;
-        this.userRepository = userRepository;
-        this.channelConverter = channelConverter;
-    }
-
-    public static ChannelService getInstance(UserRepository userRepository, ChannelRepository channelRepository) {
-        return new JCFChannelService(channelRepository, userRepository, new ChannelConverter());
-    }
-
-    @Override
-    public ChannelResponse createChannelOrThrow(CreateNewChannelRequest request) {
-        /**
-         * ==> 코드리뷰 : 메서드 내부에 다른 메서드를 호출하면서 throw가 발생가능하다는 것을 코드 블록의 메서드의 이름에 추가해야할까요?
-         * createChannel VS createChannelOrThrow
-         */
-        var findUser = findUserByIdOrThrow(request.userId());
-
-        var createdChannel = findUser.openNewChannel(request.channelName());
-
-        channelRepository.save(createdChannel);
-        userRepository.save(findUser);
-
-        return channelConverter.toDto(createdChannel);
-    }
-
-    @Override
-    public void changeChannelNameOrThrow(ChangeChannelNameRequest request) {
-        var foundUser = findUserByIdOrThrow(request.userId());
-
-        var changedChannel = foundUser.changeChannelName(request.channelId(), request.newChannelName());
-
-        channelRepository.save(changedChannel);
-        userRepository.save(foundUser);
-    }
-
-    @Override
-    public void deleteChannelByChannelIdOrThrow(DeleteChannelRequest request) {
-        var foundChannel = channelRepository.findById(request.channelId())
-                .orElseThrow(
-                        () -> ChannelException.ofErrorMessageAndNotExistChannelId(
-                                CHANNEL_NOT_FOUND,
-                                request.channelId())
-                );
-
-        var foundUser = findUserByIdOrThrow(request.userId());
-        foundChannel.deleteChannel(foundUser);
-
-        channelRepository.save(foundChannel);
-    }
-
-    private User findUserByIdOrThrow(UUID id) {
-        var foundUser = userRepository.findById(id)
-                .filter(User::isNotUnregistered)
-                .orElseThrow(() -> UserException.of(USER_NOT_FOUND));
-
-        return foundUser;
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFDirectMessageService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFDirectMessageService.java
deleted file mode 100644
index 2702cfbf7..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFDirectMessageService.java
+++ /dev/null
@@ -1,67 +0,0 @@
-package com.sprint.mission.discodeit.service.jcf;
-
-import com.sprint.mission.discodeit.common.error.ErrorMessage;
-import com.sprint.mission.discodeit.common.error.user.UserException;
-import com.sprint.mission.discodeit.repository.jcf.message.directMessage.DirectMessageRepository;
-import com.sprint.mission.discodeit.repository.jcf.user.UserRepository;
-import com.sprint.mission.discodeit.entity.message.DirectMessage;
-import com.sprint.mission.discodeit.entity.message.dto.DirectMessageInfoResponse;
-import com.sprint.mission.discodeit.entity.message.dto.SendDirectMessageRequest;
-import com.sprint.mission.discodeit.entity.user.entity.User;
-import com.sprint.mission.discodeit.service.message.converter.DirectMessageConverter;
-import com.sprint.mission.discodeit.service.message.directMessage.DirectMessageService;
-import java.util.UUID;
-
-public class JCFDirectMessageService implements DirectMessageService {
-
-    private final DirectMessageRepository directMessageRepository;
-    private final UserRepository userRepository;
-    private final DirectMessageConverter directMessageConverter;
-
-    private JCFDirectMessageService(
-            DirectMessageRepository directMessageRepository,
-            UserRepository userRepository,
-            DirectMessageConverter directMessageConverter
-    ) {
-        this.directMessageRepository = directMessageRepository;
-        this.userRepository = userRepository;
-        this.directMessageConverter = directMessageConverter;
-    }
-
-    public static DirectMessageService getInstance(
-            DirectMessageRepository directMessageRepository,
-            UserRepository userRepository
-    ) {
-        var converter = new DirectMessageConverter();
-        return new JCFDirectMessageService(directMessageRepository, userRepository, converter);
-    }
-
-    @Override
-    public DirectMessageInfoResponse sendMessage(SendDirectMessageRequest sendDirectMessageRequest) {
-
-        var foundSendUser = findUserByIdOrThrow(sendDirectMessageRequest.sendUserId());
-        var foundReceiverUser = findUserByIdOrThrow(sendDirectMessageRequest.receiveUserId());
-
-        var createdDirectMessage = DirectMessage.ofMessageAndSenderReceiver(
-                sendDirectMessageRequest.message(),
-                foundSendUser,
-                foundReceiverUser
-        );
-
-        var savedDirectMessage = directMessageRepository.save(createdDirectMessage);
-
-        createdDirectMessage.sendMessage();
-
-        return directMessageConverter.toDto(savedDirectMessage);
-    }
-
-    private User findUserByIdOrThrow(UUID userId) {
-        var foundUser = userRepository.findById(userId)
-                .filter(User::isNotUnregistered)
-                .orElseThrow(() -> UserException.ofErrorMessageAndId(
-                        ErrorMessage.USER_NOT_FOUND, userId.toString()
-                ));
-
-        return foundUser;
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFUserService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFUserService.java
deleted file mode 100644
index b30e8fb70..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/jcf/JCFUserService.java
+++ /dev/null
@@ -1,86 +0,0 @@
-package com.sprint.mission.discodeit.service.jcf;
-
-import static com.sprint.mission.discodeit.common.error.ErrorMessage.USER_NOT_FOUND;
-
-import com.sprint.mission.discodeit.common.error.user.UserException;
-import com.sprint.mission.discodeit.repository.jcf.user.UserRepository;
-import com.sprint.mission.discodeit.entity.user.dto.ExitChannelRequest;
-import com.sprint.mission.discodeit.entity.user.entity.User;
-import com.sprint.mission.discodeit.entity.user.dto.FindUserRequest;
-import com.sprint.mission.discodeit.entity.user.dto.ModifyUserInfoRequest;
-import com.sprint.mission.discodeit.entity.user.dto.RegisterUserRequest;
-import com.sprint.mission.discodeit.entity.user.dto.UnregisterUserRequest;
-import com.sprint.mission.discodeit.entity.user.dto.UserInfoResponse;
-import com.sprint.mission.discodeit.service.user.UserConverter;
-import com.sprint.mission.discodeit.service.user.UserService;
-import java.util.UUID;
-
-public class JCFUserService implements UserService {
-
-    private final UserRepository userRepository;
-    private final UserConverter converter;
-
-    public JCFUserService(
-            UserRepository userRepository,
-            UserConverter converter
-    ) {
-        this.userRepository = userRepository;
-        this.converter = converter;
-    }
-
-    @Override
-    public UserInfoResponse register(RegisterUserRequest registerUserRequest) {
-        var entity = converter.toEntity(registerUserRequest);
-        var savedEntity = userRepository.save(entity);
-
-        return converter.toDto(savedEntity);
-    }
-
-    @Override
-    public UserInfoResponse findUserByUsernameOrThrow(FindUserRequest findUserRequest) {
-        var foundUser = userRepository.findByUsername(findUserRequest.username())
-                .filter(User::isNotUnregistered)
-                .map(converter::toDto)
-                .orElseThrow(() -> UserException.of(USER_NOT_FOUND));
-
-        return foundUser;
-    }
-
-    @Override
-    public UserInfoResponse modifyUserInfo(ModifyUserInfoRequest request) {
-        var foundUser = findByUserIdOrThrow(request.id());
-
-        foundUser.changeUserName(request.changeUsername());
-        userRepository.save(foundUser);
-
-        var response = converter.toDto(foundUser);
-        return response;
-    }
-
-    @Override
-    public void UnRegisterUser(UnregisterUserRequest request) {
-        var foundUser = findByUserIdOrThrow(request.id());
-
-        foundUser.unregister();
-
-        userRepository.save(foundUser);
-    }
-
-    @Override
-    public void exitChannel(ExitChannelRequest request) {
-        var foundUser = findByUserIdOrThrow(request.userId());
-        foundUser.exitParticipatedChannel(request.channelId());
-        userRepository.save(foundUser);
-    }
-
-    private User findByUserIdOrThrow(UUID id) {
-        var entity = userRepository.findById(id)
-                .filter(User::isNotUnregistered)
-                .orElseThrow(() -> UserException.of(USER_NOT_FOUND));
-        return entity;
-    }
-
-    public static JCFUserService getInstance(UserRepository userRepository) {
-        return new JCFUserService(userRepository, new UserConverter());
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/message/channelMessage/ChannelMessageService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/message/channelMessage/ChannelMessageService.java
deleted file mode 100644
index 4578cc6ba..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/message/channelMessage/ChannelMessageService.java
+++ /dev/null
@@ -1,9 +0,0 @@
-package com.sprint.mission.discodeit.service.message.channelMessage;
-
-import com.sprint.mission.discodeit.entity.message.dto.ChannelMessageInfoResponse;
-import com.sprint.mission.discodeit.entity.message.dto.SendChannelMessageRequest;
-
-public interface ChannelMessageService {
-
-    ChannelMessageInfoResponse sendMessage(SendChannelMessageRequest sendChannelMessageRequest);
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/message/converter/ChannelMessageConverter.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/message/converter/ChannelMessageConverter.java
deleted file mode 100644
index da9d6f802..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/message/converter/ChannelMessageConverter.java
+++ /dev/null
@@ -1,21 +0,0 @@
-package com.sprint.mission.discodeit.service.message.converter;
-
-import com.sprint.mission.discodeit.entity.message.ChannelMessage;
-import com.sprint.mission.discodeit.entity.message.dto.ChannelMessageInfoResponse;
-import com.sprint.mission.discodeit.entity.message.dto.ChannelMessageInfoResponse.Builder;
-import org.springframework.stereotype.Component;
-
-@Component
-public class ChannelMessageConverter {
-
-    public ChannelMessageInfoResponse toDto(ChannelMessage message) {
-        var response = new ChannelMessageInfoResponse.Builder()
-                .messageId(message.getId())
-                .sendUserId(message.getMessageSender().getId())
-                .receiveChannelId(message.getReceiverChannel().getId())
-                .message(message.getMessage())
-                .build();
-
-        return response;
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/message/converter/DirectMessageConverter.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/message/converter/DirectMessageConverter.java
deleted file mode 100644
index 869eeb796..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/message/converter/DirectMessageConverter.java
+++ /dev/null
@@ -1,21 +0,0 @@
-package com.sprint.mission.discodeit.service.message.converter;
-
-import com.sprint.mission.discodeit.entity.message.DirectMessage;
-import com.sprint.mission.discodeit.entity.message.dto.DirectMessageInfoResponse;
-import com.sprint.mission.discodeit.entity.message.dto.DirectMessageInfoResponse.Builder;
-import org.springframework.stereotype.Component;
-
-@Component
-public class DirectMessageConverter {
-
-    public DirectMessageInfoResponse toDto(DirectMessage directMessage) {
-        var response = new Builder()
-                .messageId(directMessage.getId())
-                .sender(directMessage.getMessageSender().getId())
-                .receiver(directMessage.getMessageReceiver().getId())
-                .message(directMessage.getMessage())
-                .build();
-
-        return response;
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/message/directMessage/DirectMessageService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/message/directMessage/DirectMessageService.java
deleted file mode 100644
index 1eee17b5a..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/message/directMessage/DirectMessageService.java
+++ /dev/null
@@ -1,9 +0,0 @@
-package com.sprint.mission.discodeit.service.message.directMessage;
-
-import com.sprint.mission.discodeit.entity.message.dto.DirectMessageInfoResponse;
-import com.sprint.mission.discodeit.entity.message.dto.SendDirectMessageRequest;
-
-public interface DirectMessageService {
-
-    DirectMessageInfoResponse sendMessage(SendDirectMessageRequest sendDirectMessageRequest);
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/user/UserConverter.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/user/UserConverter.java
deleted file mode 100644
index 224217f7d..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/user/UserConverter.java
+++ /dev/null
@@ -1,36 +0,0 @@
-package com.sprint.mission.discodeit.service.user;
-
-import com.sprint.mission.discodeit.entity.user.dto.RegisterUserRequest;
-import com.sprint.mission.discodeit.entity.user.dto.UserInfoResponse;
-import com.sprint.mission.discodeit.entity.user.entity.User;
-import java.util.Objects;
-import org.springframework.stereotype.Component;
-
-@Component
-public class UserConverter {
-    private static UserConverter INSTANCE;
-
-    public UserConverter() {
-    }
-
-    public static UserConverter getInstance() {
-        if (INSTANCE == null) {
-            INSTANCE = new UserConverter();
-        }
-        return Objects.requireNonNull(INSTANCE);
-    }
-
-    public User toEntity(RegisterUserRequest request) {
-        var createdUser = User.createFrom(request.name());
-        return createdUser;
-    }
-
-    public UserInfoResponse toDto(User user) {
-        var responseDto = new UserInfoResponse(
-                user.getId(),
-                user.getNicknameValue(),
-                user.getStatus()
-        );
-        return responseDto;
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/user/UserService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/user/UserService.java
deleted file mode 100644
index cea20b893..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/service/user/UserService.java
+++ /dev/null
@@ -1,28 +0,0 @@
-package com.sprint.mission.discodeit.service.user;
-
-import com.sprint.mission.discodeit.repository.jcf.user.UserRepository;
-import com.sprint.mission.discodeit.entity.user.dto.ExitChannelRequest;
-import com.sprint.mission.discodeit.entity.user.dto.FindUserRequest;
-import com.sprint.mission.discodeit.entity.user.dto.ModifyUserInfoRequest;
-import com.sprint.mission.discodeit.entity.user.dto.RegisterUserRequest;
-import com.sprint.mission.discodeit.entity.user.dto.UnregisterUserRequest;
-import com.sprint.mission.discodeit.entity.user.dto.UserInfoResponse;
-import com.sprint.mission.discodeit.service.jcf.JCFUserService;
-
-public interface UserService {
-
-    UserInfoResponse register(RegisterUserRequest registerUserRequest);
-
-    UserInfoResponse findUserByUsernameOrThrow(FindUserRequest findUserRequest);
-
-    UserInfoResponse modifyUserInfo(ModifyUserInfoRequest request);
-
-    void UnRegisterUser(UnregisterUserRequest request);
-
-    void exitChannel(ExitChannelRequest request);
-
-    public static UserService getJCFUserService(UserRepository userRepository) {
-        return JCFUserService.getInstance(userRepository);
-    }
-
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/DiscodeitApplicationTests.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/DiscodeitApplicationTests.java
deleted file mode 100644
index 1c51df754..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/DiscodeitApplicationTests.java
+++ /dev/null
@@ -1,9 +0,0 @@
-package com.sprint.mission.discodeit;
-
-import org.junit.jupiter.api.Test;
-import org.springframework.boot.test.context.SpringBootTest;
-
-@SpringBootTest
-class DiscodeitApplicationTests {
-
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/UUIDTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/UUIDTest.java
deleted file mode 100644
index 4bd085631..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/UUIDTest.java
+++ /dev/null
@@ -1,21 +0,0 @@
-package com.sprint.mission.discodeit;
-
-import static org.assertj.core.api.Assertions.*;
-
-import java.util.UUID;
-import org.assertj.core.api.Assertions;
-import org.junit.jupiter.api.Test;
-
-public class UUIDTest {
-
-    @Test
-    void uuidTest() {
-        var uuid = UUID.randomUUID();
-        var targetUUID = UUID.fromString(uuid.toString());
-
-        var retsult = uuid.equals(targetUUID);
-
-        assertThat(retsult).isTrue();
-    }
-
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/EmailTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/EmailTest.java
new file mode 100644
index 000000000..1ef1ca6ff
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/EmailTest.java
@@ -0,0 +1,32 @@
+package com.sprint.mission.discodeit.domain.user;
+
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+class EmailTest {
+
+    @ParameterizedTest
+    @ValueSource(strings = {
+            "test@example.com",          // ✅ 일반적인 이메일
+            "user.name@domain.co.kr",    // ✅ 도메인에 . 포함 가능
+            "valid_email123@gmail.com",  // ✅ 숫자, 밑줄 포함 가능
+            "email.with+symbol@domain.com", // ✅ `+` 포함 가능
+            "firstname.lastname@example.com", // ✅ 마침표(`.`) 포함 가능
+            "email@sub.domain.com",      // ✅ 서브 도메인 포함 가능
+            "123456@example.org",        // ✅ 숫자만 포함 가능
+            "user_name@company.net",     // ✅ 밑줄 포함 가능
+            "email@domain.io",           // ✅ `io` 같은 도메인 가능
+            "valid-email@domain.info",   // ✅ `-` 포함 가능
+            "email@domain.tech",         // ✅ 최신 TLD (예: `.tech`) 지원
+            "abc.def@ghi.jkl",           // ✅ 짧은 도메인 허용
+            "valid-email@sub.domain.co.uk" // ✅ 여러 개의 서브도메인 가능
+    })
+    void 이메일_생성_성공(String email) {
+        //given
+        // when
+        Email createdEmail = new Email(email);
+        // then
+        Assertions.assertThat(createdEmail.getValue()).isEqualTo(email);
+    }
+}
\ No newline at end of file
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/NicknameTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/NicknameTest.java
new file mode 100644
index 000000000..3dca6f1de
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/NicknameTest.java
@@ -0,0 +1,36 @@
+package com.sprint.mission.discodeit.domain.user;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+class NicknameTest {
+
+    @ParameterizedTest
+    @ValueSource(strings = {
+            "User1",       // 일반적인 영어 이름
+            "유저123",      // 한글 + 숫자 조합
+            "emoji😊",     // 영어 + 이모지
+            "닉네임_테스트", // 한글 + 밑줄
+            "user_name",   // 영어 + 밑줄
+            "유저_이름",    // 한글 + 밑줄
+            "테스트123",    // 한글 + 숫자 조합
+            "유저_😊",      // 한글 + 이모지
+            "123456789012345", // 최대 길이 15글자
+            "😊😊😊😊😊",     // 이모지만 사용 (최대 5글자 이모지)
+            "name_123",    // 밑줄 + 숫자 조합
+            "_under_score",// 밑줄로 시작 가능 여부
+            "이름😊",       // 한글 + 이모지
+            "USERNAME",    // 영어 대문자
+            "User_😊_Name" // 영어 + 밑줄 + 이모지
+    })
+    void 유저_닉네임_생성_성공(String nickname) {
+        //given
+        // when
+        Nickname createNickname = new Nickname(nickname);
+        // then
+        assertThat(createNickname.getValue()).isEqualTo(nickname);
+    }
+
+}
\ No newline at end of file
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/UsernameTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/UsernameTest.java
new file mode 100644
index 000000000..ce1708b01
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/UsernameTest.java
@@ -0,0 +1,30 @@
+package com.sprint.mission.discodeit.domain.user;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+class UsernameTest {
+
+    @ParameterizedTest
+    @ValueSource(strings = {
+            "user123",         // ✅ 정상적인 영어+숫자
+            "john_doe",        // ✅ 밑줄 포함 허용
+            "player.99",       // ✅ 마침표 포함 허용
+            "nickname_",       // ✅ 밑줄(_) 끝 가능
+            "_nickname",       // ✅ 밑줄(_) 시작 가능
+            "nickname.valid",  // ✅ 밑줄 + 마침표 포함 허용
+            "validUser123",    // ✅ 대문자 포함 가능
+            "user.name.123",   // ✅ 여러 개의 마침표 허용 (연속된 마침표 제외)
+            "abcdefghijklmnopqrstuvwxyzabcd", // ✅ 32자 최대 허용
+    })
+    void 유저_이름_생성_성공(String username) {
+        //given
+        // when
+        Username createUsername = new Username(username);
+        // then
+        assertThat(createUsername.getValue()).isEqualTo(username);
+    }
+
+}
\ No newline at end of file
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/EmailValidatorTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/EmailValidatorTest.java
new file mode 100644
index 000000000..63d1a40ed
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/EmailValidatorTest.java
@@ -0,0 +1,39 @@
+package com.sprint.mission.discodeit.domain.user.validation;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import com.sprint.mission.discodeit.domain.user.exception.EmailInvalidException;
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.NullAndEmptySource;
+import org.junit.jupiter.params.provider.ValueSource;
+
+class EmailValidatorTest {
+
+    @ParameterizedTest
+    @NullAndEmptySource
+    @ValueSource(strings = {
+            "abc",              // 일반 문자열
+            "abc@",             // '@'만 포함
+            "@example.com",     // 로컬 부분 없음
+            "abc@example",      // 최상위 도메인 없음
+            "abc@.com",         // 도메인 부분이 비정상적
+            "abc@com.",         // 도메인 형식 오류
+            "abc@@example.com", // '@' 중복
+            "abc example.com",  // 공백 포함
+            "abc@ex@ample.com", // 여러 개의 '@'
+            "abc@example..com", // 연속된 '.' 포함
+            "abc@example.c",    // 너무 짧은 TLD
+            "abc@example#com",  // 특수 문자 포함
+            "abc@.com",         // 도메인 앞부분 없음
+            "abc@exam_ple.com", // 언더스코어 포함 (일반적으로 허용되지 않음)
+    })
+    void 이메일_생성_Invalid값_에러throw(String email) {
+        //given
+        // when
+        Throwable throwable = Assertions.catchThrowable(() -> EmailValidator.valid(email));
+        // then
+        assertThat(throwable).isInstanceOf(EmailInvalidException.class);
+    }
+
+}
\ No newline at end of file
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/NicknameValidatorTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/NicknameValidatorTest.java
new file mode 100644
index 000000000..3b7bdad9d
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/NicknameValidatorTest.java
@@ -0,0 +1,46 @@
+package com.sprint.mission.discodeit.domain.user.validation;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.catchThrowable;
+import static org.junit.jupiter.api.Assertions.*;
+
+import com.sprint.mission.discodeit.domain.user.Nickname;
+import com.sprint.mission.discodeit.domain.user.exception.NickNameInvalidException;
+import java.util.stream.Stream;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
+import org.junit.jupiter.params.provider.NullAndEmptySource;
+import org.junit.jupiter.params.provider.ValueSource;
+
+class NicknameValidatorTest {
+
+    @ParameterizedTest
+    @NullAndEmptySource
+    @MethodSource("nicknameOverLengthProvider")
+    @ValueSource(strings = {
+            "admin",              // 금지된 단어
+            "moderator",          // 금지된 단어
+            "discord123",         // 금지된 단어 포함
+            "superadmin",         // 금지된 단어 포함
+            "mod🚀",             // 금지된 단어 포함 + 이모지 (이모지는 가능하지만 금지어 포함이라 제한)
+            "hello admin!",       // 금지된 단어 포함
+            "AdminUser",          // 금지된 단어 포함 (대소문자 무시)
+            "DISCORD🔥",         // 금지된 단어 포함 (대소문자 무시)
+            "root_user",          // 금지된 단어 포함 (관리자 권한 관련)
+            "system_mod",         // 금지된 단어 포함
+            "운영자",              // 한글 운영자 금지
+            "테스트관리자",         // 한글 관리자 관련 단어 포함
+            "봇",                  // 봇 계정 금지
+    })
+    void 유저닉네임_제한되는_입력값_에러검증throw(String nickname) {
+        //given
+        // when
+        Throwable catchThrowable = catchThrowable(() -> new Nickname(nickname));
+        // then
+        assertThat(catchThrowable).isInstanceOf(NickNameInvalidException.class);
+    }
+
+    static Stream<String> nicknameOverLengthProvider() {
+        return Stream.of("a".repeat(33));
+    }
+}
\ No newline at end of file
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/UsernameValidatorTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/UsernameValidatorTest.java
new file mode 100644
index 000000000..503782dd9
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/UsernameValidatorTest.java
@@ -0,0 +1,53 @@
+package com.sprint.mission.discodeit.domain.user.validation;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import com.sprint.mission.discodeit.domain.user.exception.UserNameInvalidException;
+import java.util.stream.Stream;
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
+import org.junit.jupiter.params.provider.NullAndEmptySource;
+import org.junit.jupiter.params.provider.ValueSource;
+
+class UsernameValidatorTest {
+
+    @ParameterizedTest
+    @NullAndEmptySource
+    @ValueSource(strings = {
+            "a",                      // 너무 짧음 (최소 2자)
+            "abcdefghijklmnopqrstuvwxyzabcdefghi", // 너무 김 (32자 초과, 33자)
+            "user name",              // 공백 포함 (허용되지 않음)
+            "🔥coolgamer",           // 이모지 포함 (정규식이 허용하지 않음)
+            "user!name",             // 특수문자 포함 (! 허용되지 않음)
+            "....hidden....",         // 연속된 마침표 (허용되지 않음)
+            ".username",              // 마침표로 시작 (허용되지 않음)
+            "username.",              // 마침표로 끝남 (허용되지 않음)
+            "admin",                  // 금지된 단어 포함
+            "moderator",              // 금지된 단어 포함
+            "discord123",             // 금지된 단어 포함
+            "superadmin",             // 금지된 단어 포함
+            "mod🚀",                  // 금지된 단어 포함 + 이모지
+            "hello admin!",           // 금지된 단어 포함
+            "AdminUser",              // 금지된 단어 포함 (대소문자 무시)
+            "DISCORD🔥",             // 금지된 단어 포함 (대소문자 무시)
+            "root_user",              // 금지된 단어 포함 (관리자 권한 관련)
+            "system_mod",             // 금지된 단어 포함
+            "운영자",                 // 한글 운영자 금지
+            "테스트관리자",            // 한글 관리자 관련 단어 포함
+            "봇",                     // 봇 계정 금지
+    })
+    @MethodSource("usernameOverLengthProvider")
+    void testMethodNameHere(String username) {
+        //given
+        // when
+        Throwable catchThrowable = Assertions.catchThrowable(() -> UsernameValidator.validate(username));
+        // then
+        Assertions.assertThat(catchThrowable).isInstanceOf(UserNameInvalidException.class);
+    }
+
+    static Stream<String> usernameOverLengthProvider() {
+        return Stream.of("a".repeat(33));
+    }
+}
\ No newline at end of file
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/channel/ChannelTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/channel/ChannelTest.java
deleted file mode 100644
index c95c98fe8..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/channel/ChannelTest.java
+++ /dev/null
@@ -1,108 +0,0 @@
-package com.sprint.mission.discodeit.entity.channel;
-
-import static com.sprint.mission.discodeit.entity.common.Status.MODIFIED;
-import static com.sprint.mission.discodeit.entity.common.Status.UNREGISTERED;
-import static org.assertj.core.api.Assertions.assertThat;
-import static org.junit.jupiter.api.Assertions.assertAll;
-
-import com.sprint.mission.discodeit.entity.user.entity.User;
-import org.junit.jupiter.api.BeforeEach;
-import org.junit.jupiter.api.DisplayName;
-import org.junit.jupiter.api.Nested;
-import org.junit.jupiter.api.Test;
-
-@DisplayName("채널 도메인")
-class ChannelTest {
-    private static final String CHANNEL_NAME = "스프린트_백엔드_1기";
-    private static final String USER_NAME = "SB_1기_백재우";
-    private static final User USER = User.createFrom(USER_NAME);
-    private Channel channel;
-
-    @Test
-    @DisplayName("새로운 채널 생성")
-    void createChannelThenSuccess() {
-        assertThat(Channel.createOfChannelNameAndUser(CHANNEL_NAME, USER))
-                .isNotNull();
-    }
-
-    @Nested
-    @DisplayName("메서드 검사")
-    class whenUseMethodTest {
-
-        @BeforeEach
-        void setUp() {
-            channel = Channel.createOfChannelNameAndUser(CHANNEL_NAME, USER);
-        }
-
-        @Test
-        @DisplayName("변경하려는 새로운 이름으로 채널이름 변경하면 채널의 이름과 상태가 변경")
-        void givenChangeChannelNameWhenChangeNameThenUpdateStatusAndChannelName() {
-            // given
-            var newChannelName = "SB_999기_백재우";
-            // then
-            channel.changeName(newChannelName, USER);
-            // when
-            assertAll(
-                    () -> {
-                        assertThat(channel.getChannelName()).isNotEqualTo(CHANNEL_NAME);
-                        assertThat(channel.getStatus()).isEqualTo(MODIFIED);
-                    }
-            );
-        }
-
-        @Test
-        @DisplayName("채널을 삭제 시 상태가 변경")
-        void givenChannelWhenDeleteChannelThenStatusUpdate() {
-            // given
-            // when
-            channel.deleteChannel(USER);
-            // then
-            assertThat(channel.getStatus()).isEqualTo(UNREGISTERED);
-        }
-
-        @Test
-        @DisplayName("매개변수로 들어온 이름과 채널 객체의 이름이 같을 경우, 상태가 해지 상태가 아닐 시 True 반환")
-        void givenSameChannelNameWhenIsEqualFromNameAndNotUnregisteredThenTrue() {
-            // given
-
-            // when
-            var validResult = channel.isStatusNotUnregisteredAndEqualsTo(CHANNEL_NAME);
-            // then
-            assertThat(validResult).isTrue();
-        }
-
-        @Test
-        @DisplayName("매개변수로 들어온 이름과 채널 객체의 이름이 다를 경우, 상태가 해지 상태가 아닐 시 False 반환")
-        void givenDifferentChannelNameWhenIsEqualFromNameAndNotUnregisteredThenFalse() {
-            // given
-            var differentChannelName = "스프린트_백엔드_100기";
-            // when
-            var validResult = channel.isStatusNotUnregisteredAndEqualsTo(differentChannelName);
-            // then
-            assertThat(validResult).isFalse();
-        }
-
-        @Test
-        @DisplayName("찾으려는 채널이름과 비교하려는 채널 객체의 이름이 같고 해지상태가 아닐 경우 true 반환")
-        void givenSameNameWhenIsStatusNotUnregisteredAndEqualsToThenTrue() {
-            // given
-            var findChannelNameRequest = CHANNEL_NAME;
-            // when
-            var isEquals = channel.isStatusNotUnregisteredAndEqualsTo(findChannelNameRequest);
-            // then
-            assertThat(isEquals).isTrue();
-        }
-
-        @Test
-        @DisplayName("찾으려는 채널이름과 비교하려는 채널 객체 이름이 같고 해지상태일 경우 false 반환")
-        void givenSameNameAndUnregisteredWhenIsStatusNotUnregisteredThenFalse() {
-            // given
-            var findChannelNameRequest = CHANNEL_NAME;
-            channel.updateUnregistered();
-            // when
-            var isEquals = channel.isStatusNotUnregisteredAndEqualsTo(findChannelNameRequest);
-            // then
-            assertThat(isEquals).isFalse();
-        }
-    }
-}
\ No newline at end of file
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/common/AbstractUUIDTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/common/AbstractUUIDTest.java
deleted file mode 100644
index c0e565839..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/common/AbstractUUIDTest.java
+++ /dev/null
@@ -1,75 +0,0 @@
-package com.sprint.mission.discodeit.entity.common;
-
-import static com.sprint.mission.discodeit.entity.common.Status.MODIFIED;
-import static com.sprint.mission.discodeit.entity.common.Status.REGISTERED;
-import static org.assertj.core.api.Assertions.assertThat;
-import static org.junit.jupiter.api.Assertions.assertAll;
-import static org.junit.jupiter.api.Assertions.assertEquals;
-import static org.junit.jupiter.api.Assertions.assertNotEquals;
-
-import com.sprint.mission.discodeit.testdummy.TestUUIDEntity;
-import java.lang.reflect.Field;
-import java.util.UUID;
-import org.junit.jupiter.api.BeforeEach;
-import org.junit.jupiter.api.DisplayName;
-import org.junit.jupiter.api.Test;
-
-public class AbstractUUIDTest {
-
-    private BaseEntity entity;
-
-
-    @BeforeEach
-    void init() {
-        entity = new TestUUIDEntity();
-    }
-
-    @Test
-    @DisplayName("공통 엔티티 추상 클래스 생성 시 id, createdAt, status 필드 초기화 시 Not Null test")
-    void createAbstractUUIDThenInitializeFieldIdAndCreatedAtAndStatusIsNotNullTest() {
-        assertAll(
-                () -> assertThat(entity.getId()).as("Id should not be null").isNotNull(),
-                () -> assertThat(entity.getCreateAt()).as("createAt should not be null").isNotNull(),
-                () -> assertThat(entity.getStatus()).isEqualTo(REGISTERED)
-        );
-    }
-
-    @Test
-    @DisplayName("엔티티 내 데이터가 수정 시 updateAt and status 필드 수정 여부 테스트")
-    void givenWhenSomeDateModifyThenFieldUpdateAtAndStatusIsChangedTest() {
-        // given
-        // when
-        entity.updateStatusAndUpdateAt();
-        //then
-        assertAll(
-                () -> assertThat(entity.getUpdateAt()).as("invoke update() then updateAt must be present"),
-                () -> assertThat(entity.getStatus()).isEqualTo(MODIFIED)
-        );
-    }
-
-    @Test
-    @DisplayName("동일한 UUID를 가진 객체간의 동등성 비교를 할 경우 True를 반환하는지 테스트")
-    void givenCreateAbstractEntityAndEqualEntityWhenIsEqualsThenReturnTrueTest() throws Exception {
-        // given
-        BaseEntity entity1 = new TestUUIDEntity();
-        BaseEntity entity2 = new TestUUIDEntity();
-
-        UUID sameUUID = UUID.randomUUID();
-
-        setFinalField(entity1, "id", sameUUID);
-        setFinalField(entity2, "id", sameUUID);
-
-        // then
-        assertEquals(entity1, entity2, "Entities with the same UUID should be equal");
-
-        BaseEntity entity3 = new TestUUIDEntity();
-        assertNotEquals(entity1, entity3, "Entities with different UUIDs should not be equal");
-    }
-
-    // 리플렉션. 이 부분 코드 리뷰 XXX
-    private void setFinalField(Object object, String fieldName, Object value) throws Exception {
-        Field field = object.getClass().getSuperclass().getDeclaredField(fieldName);
-        field.setAccessible(true);
-        field.set(object, value);
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/UserNameTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/UserNameTest.java
deleted file mode 100644
index 3880736b3..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/UserNameTest.java
+++ /dev/null
@@ -1,98 +0,0 @@
-package com.sprint.mission.discodeit.entity.user;
-
-import static com.sprint.mission.discodeit.entity.user.entity.UserName.NAME_MAX_LENGTH;
-import static org.assertj.core.api.Assertions.assertThat;
-import static org.assertj.core.api.Assertions.catchNullPointerException;
-import static org.assertj.core.api.BDDAssertions.then;
-
-import com.sprint.mission.discodeit.entity.user.entity.UserName;
-import jakarta.validation.ConstraintViolation;
-import jakarta.validation.Validation;
-import jakarta.validation.Validator;
-import java.util.Set;
-import java.util.stream.Stream;
-import net.bytebuddy.asm.Advice.Thrown;
-import org.junit.jupiter.api.BeforeEach;
-import org.junit.jupiter.api.DisplayName;
-import org.junit.jupiter.api.Nested;
-import org.junit.jupiter.api.Test;
-import org.junit.jupiter.params.ParameterizedTest;
-import org.junit.jupiter.params.provider.MethodSource;
-import org.junit.jupiter.params.provider.NullAndEmptySource;
-import org.junit.jupiter.params.provider.NullSource;
-
-class UserNameTest {
-
-    private UserName userName;
-
-    private Validator validator;
-
-    @BeforeEach
-    void setUp() {
-        validator = Validation.buildDefaultValidatorFactory().getValidator();
-    }
-
-    static Stream<String> stringProvider() {
-        return Stream.of(
-                ".".repeat(NAME_MAX_LENGTH + 1),
-                "T",
-                "TT"
-        );
-    }
-
-    @ParameterizedTest(name = "[test {index}] ==> given name : {arguments}")
-    @NullSource
-    @DisplayName("요구되는 유저의 이름이 비어있는 value 제공 시 에러 발생 테스트")
-    void givenUserNameLengthLessThanRequiredLengthWhenCreateUserThenThrowException(String name) {
-        // given
-
-//        Set<ConstraintViolation<UserName>> violations = validator.validate(userName);
-
-        // when
-        Throwable thrown = catchNullPointerException(() -> userName = UserName.createFrom(name));
-        // then
-        assertThat(thrown).isInstanceOf(NullPointerException.class);
-//        assertThat(violations.size()).isEqualTo(1);
-    }
-
-    @ParameterizedTest(name = "given name : {arguments}")
-    @MethodSource("stringProvider")
-    @DisplayName("유저의 이름의 제한을 넘어가는 문자열로 생성 시 에러 발생 테스트")
-    void givenMoreThanInvalidLengthNameWhenCreateUserNameThenThrowException(String overLengthName) {
-        // given
-        userName = UserName.createFrom(overLengthName);
-        Set<ConstraintViolation<UserName>> violations = validator.validate(userName);
-        // then
-        assertThat(violations.size()).isEqualTo(1);
-    }
-
-
-    @Nested
-    @DisplayName("초기화 후 기능 테스트")
-    class whenSetup {
-
-        private static final String USER_NAME = "SB_1기_백재우";
-
-        @BeforeEach
-        void setup() {
-            userName = UserName.createFrom(USER_NAME);
-        }
-
-        @Test
-        @DisplayName("특정 문자열을 통해 UserName 객체 생성 후 동일한 문자열을 리턴 테스트")
-        void givenNameWhenCreateUserNameThenReturnUserName() {
-            then(userName.getName()).isEqualTo(USER_NAME);
-        }
-
-        @Test
-        @DisplayName("새로운 이름으로 사용자 이름을 변경 시 새로운 UserName 객체 반환")
-        void givenNewUserNameWhenChangeUserNameThenReturnNewUserName() {
-            // given
-            String newName = "SB_2기_백재우";
-            // when
-            var newUserName = userName.changeName(newName);
-            // then
-            then(newUserName).isNotEqualTo(userName);
-        }
-    }
-}
\ No newline at end of file
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/UserTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/UserTest.java
deleted file mode 100644
index 198cef97b..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/UserTest.java
+++ /dev/null
@@ -1,100 +0,0 @@
-package com.sprint.mission.discodeit.entity.user;
-
-import static com.sprint.mission.discodeit.entity.common.Status.UNREGISTERED;
-import static org.assertj.core.api.Assertions.assertThat;
-
-import com.sprint.mission.discodeit.entity.channel.Channel;
-import com.sprint.mission.discodeit.entity.user.entity.User;
-import java.util.UUID;
-import org.junit.jupiter.api.Assertions;
-import org.junit.jupiter.api.BeforeEach;
-import org.junit.jupiter.api.DisplayName;
-import org.junit.jupiter.api.Nested;
-import org.junit.jupiter.api.Test;
-
-@DisplayName("User Test")
-class UserTest {
-    private static final String USER_NAME = "test";
-    private static final String CHANNEL_NAME = "코드잇-스프린트_1기";
-    private User user;
-
-    @Test
-    void createUserTest() {
-        // given
-        String userName = "test1";
-
-        assertThat(User.createFrom(userName)).isNotNull();
-    }
-
-    @Nested
-    @DisplayName("유저 생성 수정 삭제")
-    class InitializeNew {
-        @BeforeEach
-        void setUp() {
-            user = User.createFrom(USER_NAME);
-        }
-
-        @Test
-        @DisplayName("유저 해지 요청 후 유저의 상태 변경")
-        void givenUnregisterRequestWhenUnregisterThenStatusChange() {
-            // given
-            // when
-            user.unregister();
-            // then
-            assertThat(user.getStatus()).isEqualTo(UNREGISTERED);
-        }
-    }
-
-    @Nested
-    @DisplayName("유저 채널")
-    class aboutChannel {
-        private Channel participatedChannel;
-
-        @BeforeEach
-        void setup() {
-            user = User.createFrom(USER_NAME);
-            participatedChannel = user.openNewChannel("new Channel1");
-        }
-
-        @Test
-        @DisplayName("채널 이름을 유저가 제공하여 새로운 채널을 만들면 생성된 채널 반환")
-        void givenChannelNameWhenUserCreateChannelThenReturnChannel() {
-            // given
-            var createdUser = User.createFrom(USER_NAME);
-            // when
-            var channel = createdUser.openNewChannel(CHANNEL_NAME);
-            // then
-            Assertions.assertAll(
-                    () -> {
-                        assertThat(channel).isNotNull();
-                        assertThat(channel.getChannelName()).isEqualTo(CHANNEL_NAME);
-                    }
-            );
-        }
-
-        @Test
-        @DisplayName("새로운 채널 이름으로 유저가 채널의 이름을 변경 시 변경된 채널 반환")
-        void givenChangeChannelNameWhenUserChangeChannelNameThenReturnChangedChannel() {
-            // given
-            var newChangeChannelName = "NEW CHANNEL NAME";
-            var targetChannelId = participatedChannel.getId();
-            // when
-            var changeChannel = user.changeChannelName(targetChannelId, newChangeChannelName);
-            // then
-            assertThat(changeChannel.getChannelName()).isEqualTo(newChangeChannelName);
-        }
-
-        @Test
-        @DisplayName("유저의 참가 채널 id로 참가한 채널에서 나가면 참가채널 수 감소")
-        void givenExitChannelIdWhenExitParticipatedChannelThenReturnParticipatedChannelCountDecrease() {
-            // given
-            var participatedChannelId = participatedChannel.getId();
-            var oldCount = user.countParticipatedChannels();
-            // when
-            user.exitParticipatedChannel(participatedChannelId);
-            // then
-            assertThat(user.countParticipatedChannels()).isEqualTo(oldCount - 1);
-        }
-    }
-
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/domain/EmailTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/domain/EmailTest.java
deleted file mode 100644
index 9792ff08f..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/domain/EmailTest.java
+++ /dev/null
@@ -1,23 +0,0 @@
-package com.sprint.mission.discodeit.entity.user.domain;
-
-import static org.assertj.core.api.Assertions.*;
-
-import com.sprint.mission.discodeit.domain.user.Email;
-import org.junit.jupiter.params.ParameterizedTest;
-import org.junit.jupiter.params.provider.NullAndEmptySource;
-import org.junit.jupiter.params.provider.ValueSource;
-
-class EmailTest {
-
-    @ParameterizedTest
-    @NullAndEmptySource
-    @ValueSource(strings = {"test.com"})
-    void 잘못된_이메일_형식_생성시_에러throw(String email) {
-        //given
-        // when
-        Throwable catchThrow = catchThrowable(() -> new Email(email));
-        // then
-        assertThat(catchThrow).isInstanceOf(IllegalArgumentException.class);
-    }
-
-}
\ No newline at end of file
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/domain/NicknameTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/domain/NicknameTest.java
deleted file mode 100644
index 5b83dfd2c..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/domain/NicknameTest.java
+++ /dev/null
@@ -1,35 +0,0 @@
-package com.sprint.mission.discodeit.entity.user.domain;
-
-import static org.assertj.core.api.Assertions.*;
-
-import com.sprint.mission.discodeit.domain.user.Nickname;
-import org.junit.jupiter.api.Test;
-import org.junit.jupiter.params.ParameterizedTest;
-import org.junit.jupiter.params.provider.NullAndEmptySource;
-
-class NicknameTest {
-
-    @ParameterizedTest
-    @NullAndEmptySource
-    void 유저_닉네임_생성_null값으로생성_에러throw(String value) {
-        //given
-        // when
-        Throwable catchThrowable = catchThrowable(() -> new Nickname(value));
-        // then
-        assertThat(catchThrowable).isInstanceOf(IllegalArgumentException.class);
-    }
-
-    @Test
-    void testMethodNameHere() {
-        //given
-        String nickname = "test";
-        Nickname nickname1 = new Nickname(nickname);
-        Nickname nickname2 = new Nickname(nickname);
-        // when
-        boolean result = nickname1.equals(nickname2);
-
-        // then
-        assertThat(result).isTrue();
-    }
-
-}
\ No newline at end of file
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/entity/ParticipatedChannelTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/entity/ParticipatedChannelTest.java
deleted file mode 100644
index ba64897d3..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/entity/user/entity/ParticipatedChannelTest.java
+++ /dev/null
@@ -1,220 +0,0 @@
-package com.sprint.mission.discodeit.entity.user.entity;
-
-import static com.sprint.mission.discodeit.common.error.ErrorMessage.USER_NOT_PARTICIPATED_CHANNEL;
-import static com.sprint.mission.discodeit.entity.common.Status.MODIFIED;
-import static org.assertj.core.api.Assertions.assertThat;
-import static org.assertj.core.api.AssertionsForClassTypes.catchThrowable;
-import static org.junit.jupiter.api.Assertions.assertAll;
-
-import com.sprint.mission.discodeit.common.error.channel.ChannelException;
-import com.sprint.mission.discodeit.entity.channel.Channel;
-import java.util.UUID;
-import org.junit.jupiter.api.BeforeEach;
-import org.junit.jupiter.api.DisplayName;
-import org.junit.jupiter.api.Nested;
-import org.junit.jupiter.api.Test;
-
-class ParticipatedChannelTest {
-    private static final String CHANNEL_NAME = "코드잇-1기-백엔드";
-    private ParticipatedChannel channels;
-    private static final User USER = User.createFrom("SB_1기_백재우");
-
-    @Test
-    void givenNewParticipatedChannelWhenCreateThenReturnNewParticipatedChannel() {
-        // given when
-        var createdParticipatedChannel = ParticipatedChannel.newDefault();
-        // then
-        assertThat(createdParticipatedChannel).isNotNull();
-    }
-
-    @BeforeEach
-    void setUp() {
-        channels = ParticipatedChannel.newDefault();
-    }
-
-    @Test
-    void givenChannelNameWhenCreateChannelThenReturnNewChannel() {
-        // given when
-        var channel = channels.createChannel(CHANNEL_NAME, USER);
-        // then
-        assertAll(
-                () -> {
-                    assertThat(channel).isNotNull();
-
-                    assertAll(
-                            () -> assertThat(channel.getChannelName()).isEqualTo(CHANNEL_NAME)
-                    );
-                }
-        );
-    }
-
-    @Nested
-    @DisplayName("유저의 참여 채널")
-    class givenSomeElements {
-        private static final String addChannelName1 = "스프린트_2기_백엔드";
-        private static final String addChannelName2 = "스프린트_3기_백엔드";
-        private Channel createdChannel1;
-        private Channel createdChannel2;
-
-        @BeforeEach
-        void add() {
-            createdChannel1 = channels.createChannel(addChannelName1, USER);
-            createdChannel2 = channels.createChannel(addChannelName2, USER);
-        }
-
-        @Test
-        @DisplayName("유저가 참여한 채널에서 Id를 통해 채널 조회")
-        void givenSomeElementsAddedChannelsWhenFindByIdThenReturnSomeElements() {
-            // given
-            var channelId = createdChannel1.getId();
-
-            // when
-            var findByIdParticipatedChannel = channels.findByChannelIdNotUnregisteredOrThrow(channelId);
-
-            // then
-            assertAll(
-                    () -> {
-                        assertThat(findByIdParticipatedChannel).isNotNull();
-
-                        assertAll(
-                                () -> assertThat(findByIdParticipatedChannel.orElseThrow().getId())
-                                        .isEqualTo(channelId)
-                        );
-                    }
-            );
-        }
-
-        @Test
-        @DisplayName("유저가 참여한 채널에서 channelName 을 통해 채널 조회")
-        void givenSomeElementsAddedChannelsWhenFindByNameThenReturnSomeElements() {
-            // given
-            var channelName = createdChannel1.getChannelName();
-
-            // when
-            var findByIdParticipatedChannel = channels.findByName(channelName);
-
-            // then
-            assertAll(
-                    () -> {
-                        assertThat(findByIdParticipatedChannel).isNotNull();
-
-                        assertAll(
-                                () -> assertThat(findByIdParticipatedChannel.orElseThrow().getChannelName())
-                                        .isEqualTo(addChannelName1)
-                        );
-                    }
-            );
-        }
-
-        @Test
-        @DisplayName("유저가 참여한 채널에 존재하지 않는 channel Id로 채널 조회 시 에러 발생")
-        void givenNotExistChannelIdWhenFindByIdThenThrowException() {
-            // given
-            var notExistedChannelId = UUID.randomUUID();
-
-            // when
-            var throwable = catchThrowable(() ->
-                    channels.findByChannelIdNotUnregisteredOrThrow(notExistedChannelId)
-            );
-
-            // then
-            assertThat(throwable).isInstanceOf(ChannelException.class)
-                    .hasMessageContaining(USER_NOT_PARTICIPATED_CHANNEL.getMessage());
-        }
-
-        @Test
-        @DisplayName("유저가 참여한 채널에 존재하는 ChannelName 으로 채널 조회 시 해당 채널 반환")
-        void givenExistedChannelNameWhenFindByNameThenReturnChannel() {
-            // given
-
-            // when
-            var foundChannel = channels.findByName(addChannelName1);
-            // then
-            assertThat(foundChannel)
-                    .isNotNull();
-        }
-
-        @Test
-        @DisplayName("유저가 참여한 채널에 존재하지 않는 ChannelName 으로 채널 조회시 에러")
-        void givenNotExistedChannelNameWhenFindByNameThenThrowException() {
-            // given
-            var notExistedChannelName = "SB_999기_백재우";
-
-            // when
-            var foundChannel = channels.findByName(notExistedChannelName);
-
-            // then
-            assertThat(foundChannel.orElse(null)).isNull();
-        }
-
-        @Test
-        @DisplayName("유저가 참여한 채널의 id로 채널이름을 변경 성공")
-        void givenParticipatedChannelIdAndNewChannelNameWhenChangeChannelNameThenSuccess() {
-            // given
-            var channelId = createdChannel1.getId();
-            var changeChannelName = createdChannel1.getChannelName();
-
-            // when
-            channels.changeChannelNameOrThrow(channelId, "new ChannelName", USER);
-
-            // then
-            assertAll(
-                    () -> {
-                        assertThat(createdChannel1.getChannelName()).isNotEqualTo(changeChannelName);
-                        assertThat(createdChannel1.getStatus()).isEqualTo(MODIFIED);
-                    }
-            );
-        }
-
-        @Test
-        @DisplayName("존재하지 않는 채널 id로 유저가 참여한 채널의 id로 채널이름 변경 시 에러")
-        void givenNotExistedChannelIdWhenChangeChannelNameThenThrowUserException() {
-            // given
-            var notExistedChannelId = UUID.randomUUID();
-            var changeChannelName = "new ChannelName";
-
-            // when
-            var throwable = catchThrowable(() -> channels.changeChannelNameOrThrow(notExistedChannelId, changeChannelName, USER));
-
-            // then
-            assertThat(throwable).isInstanceOf(ChannelException.class)
-                    .hasMessageContaining(notExistedChannelId.toString());
-
-        }
-
-        @Test
-        @DisplayName("채널을 생성한 사람이 아닌 다른 누군가 채널이름을 변경하려고 할 경우 에러")
-        void givenNotChannelCreatorWhenChangeChannelNameThenThrowChannelException() {
-            // given
-            var notCreatorUser = User.createFrom("is not Creator");
-            var changeChannelName = "SB_백엔드_1000기";
-            var channelId = createdChannel1.getId();
-
-            // when
-            var throwable = catchThrowable(() ->
-                    channels.changeChannelNameOrThrow(channelId, changeChannelName, notCreatorUser)
-            );
-
-            // then
-            assertThat(throwable).isInstanceOf(ChannelException.class)
-                        .hasMessageContaining(notCreatorUser.getNicknameValue());
-        }
-
-        @Test
-        @DisplayName("채널 id 값으로 유저가 참여한 채널을 삭제하면 유저가 참여한 채널 목록의 개수 감소")
-        void givenDeleteTargetIdWhenDeleteChannelThenParticipatedChannelIsRemove() {
-            // given
-            var oldParticipatedChannelCount = channels.countParticipatedChannels();
-            var deleteTargetChannelId = createdChannel2.getId();
-
-            // when
-            channels.exitChannelById(deleteTargetChannelId);
-
-            // then
-            assertThat(channels.countParticipatedChannels()).isNotEqualTo(oldParticipatedChannelCount);
-        }
-    }
-}
-
-
-
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/repository/common/InMemoryCrudRepositoryTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/repository/common/InMemoryCrudRepositoryTest.java
deleted file mode 100644
index 533989b2c..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/repository/common/InMemoryCrudRepositoryTest.java
+++ /dev/null
@@ -1,136 +0,0 @@
-package com.sprint.mission.discodeit.repository.common;
-
-import static org.assertj.core.api.Assertions.assertThat;
-import static org.junit.jupiter.api.Assertions.assertAll;
-
-import com.sprint.mission.discodeit.testdummy.TestDummyInMemoryCurdRepository;
-import com.sprint.mission.discodeit.testdummy.TestUUIDEntity;
-import java.util.UUID;
-import org.junit.jupiter.api.BeforeAll;
-import org.junit.jupiter.api.BeforeEach;
-import org.junit.jupiter.api.DisplayName;
-import org.junit.jupiter.api.Nested;
-import org.junit.jupiter.api.Test;
-
-@DisplayName("레포지토리 추상 클래스 테스트")
-class InMemoryCrudRepositoryTest {
-
-    private static TestDummyInMemoryCurdRepository repository;
-
-    @Test
-    void initializeRepositoryTest() {
-        assertThat(new TestDummyInMemoryCurdRepository()).isNotNull();
-    }
-
-    @Nested
-    @DisplayName("데이터를 저장했을 때")
-    class whenAddEntity {
-
-        @BeforeEach
-        void setUp() {
-            repository = new TestDummyInMemoryCurdRepository();
-        }
-
-        @Test
-        @DisplayName("새로운 객체를 생성하여 저장했을 때 동일한 객체가 리턴")
-        void givenNewEntityWhenSaveEntityThenReturnNewEntity() {
-            // given
-            TestUUIDEntity newEntity = new TestUUIDEntity();
-            // when
-            var savedEntity = repository.save(newEntity);
-            // then
-            assertThat(savedEntity).isEqualTo(newEntity);
-        }
-
-        @Test
-        @DisplayName("레포지토리에 저장 시 총 저장되어 있는 개수 증가")
-        void givenSaveNewEntityWhenCountRepositoryThenSizeIncrease() {
-            // given
-            var oldCount = repository.count();
-            repository.save(new TestUUIDEntity());
-            // when
-            var newCount = repository.count();
-            // then
-            assertThat(newCount).isEqualTo(oldCount + 1);
-        }
-
-        @Test
-        @DisplayName("저장한 객체와 동일한 객체의 id로 가져온 객체 비교")
-        void givenSavedEntityWhenFindByIdThenReturnEqualIsTrue() {
-            // given
-            var createdEntity = new TestUUIDEntity();
-            repository.save(createdEntity);
-            // when
-            var findEntity = repository.findById(createdEntity.getId()).orElse(null);
-            //then
-            assertThat(findEntity).isEqualTo(createdEntity);
-        }
-
-        @Test
-        @DisplayName("새로운 객체를 저장 후 삭제 시 정상 작동")
-        void givenNewEntitySaveWhenDeleteEntityThenStoreSizeNoChange() {
-            // given
-            int storeSize = repository.count();
-            var newEntity = new TestUUIDEntity();
-            repository.save(newEntity);
-            // when
-            repository.deleteById(newEntity.getId());
-            // then
-            assertThat(repository.count()).isEqualTo(storeSize);
-        }
-    }
-
-    @Nested
-    @DisplayName("저장된 객체")
-    class whenFindEntity {
-        private static final int REPOSITORY_SIZE = 10;
-        private static TestUUIDEntity entity;
-
-        @BeforeAll
-        static void setUp() {
-            repository = new TestDummyInMemoryCurdRepository();
-            entity = new TestUUIDEntity();
-            repository.save(entity);
-            for (int i = 0; i < REPOSITORY_SIZE; i++) {
-                repository.save(new TestUUIDEntity());
-            }
-        }
-
-        @Test
-        @DisplayName("확실히 저장되어 있는 객체를 id로 레포지터리에서 찾을 때 true 리턴")
-        void givenEnsureEntityIdWhenFindByIdThenReturnTrue() {
-            // given
-            var existId = entity.getId();
-            // when
-            var result = repository.isExistsById(existId);
-            // then
-            assertThat(result).isTrue();
-        }
-
-        @Test
-        @DisplayName("존재하지 않는 id로 레포지터리에서 찾을 때 false 리턴")
-        void givenGenerateUUIDWhenFindByIdThenReturnFalse() {
-            // given
-            var id = UUID.randomUUID();
-            // when
-            var result = repository.isExistsById(id);
-            //then
-            assertThat(result).isFalse();
-        }
-
-        // 모든 저장된 객체를 가져오기
-        @Test
-        @DisplayName("저장된 모든 객체를 리스트로 조회시 레포지터리 count 메서드의 결과 비교")
-        void whenFindAllThenReturnAll() {
-            // given
-            int repositorySize = repository.count();
-            // when
-            var allEntity = repository.findAll();
-            // then
-            assertAll(
-                    () -> assertThat(allEntity).isNotEmpty(),
-                    () -> assertThat(allEntity.size()).isEqualTo(repositorySize)
-            );
-        }
-    }
-}
\ No newline at end of file
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/repository/user/UserRepositoryImplTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/repository/user/UserRepositoryImplTest.java
deleted file mode 100644
index 0e677848c..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/repository/user/UserRepositoryImplTest.java
+++ /dev/null
@@ -1,39 +0,0 @@
-package com.sprint.mission.discodeit.repository.user;
-
-import static org.assertj.core.api.Assertions.assertThat;
-import static org.junit.jupiter.api.Assertions.assertAll;
-
-import com.sprint.mission.discodeit.entity.user.entity.User;
-import com.sprint.mission.discodeit.repository.jcf.user.UserRepository;
-import com.sprint.mission.discodeit.testdummy.TestDummyFactory;
-import org.junit.jupiter.api.BeforeEach;
-import org.junit.jupiter.api.DisplayName;
-import org.junit.jupiter.api.Test;
-
-class UserRepositoryImplTest {
-    private static final String TEST_NAME = "Test";
-    private User user;
-    private UserRepository userRepository;
-
-    @BeforeEach
-    void setUp() {
-        userRepository = TestDummyFactory.getUserRepository();
-        user = User.createFrom(TEST_NAME);
-        userRepository.save(user);
-    }
-
-
-    @Test
-    @DisplayName("사용자 이름으로 찾을 때 유저정보 객체를 리턴")
-    void givenUsernameWhenFindByNameThenReturnUser() {
-        // given
-        // when
-        var findUser = userRepository.findByUsername(TEST_NAME).orElse(null);
-        // then
-        assertAll(
-                () -> assertThat(findUser).isEqualTo(user),
-                () -> assertThat(findUser).isNotNull()
-        );
-    }
-
-}
\ No newline at end of file
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/service/jcf/JCFChannelServiceTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/service/jcf/JCFChannelServiceTest.java
deleted file mode 100644
index 296300e59..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/service/jcf/JCFChannelServiceTest.java
+++ /dev/null
@@ -1,51 +0,0 @@
-package com.sprint.mission.discodeit.service.jcf;
-
-import static org.mockito.Mockito.times;
-import static org.mockito.Mockito.verify;
-import static org.mockito.Mockito.when;
-
-import com.sprint.mission.discodeit.repository.jcf.channel.ChannelRepository;
-import com.sprint.mission.discodeit.repository.jcf.user.UserRepository;
-import com.sprint.mission.discodeit.entity.channel.Channel;
-import com.sprint.mission.discodeit.entity.channel.dto.CreateNewChannelRequest;
-import com.sprint.mission.discodeit.entity.user.entity.User;
-import com.sprint.mission.discodeit.service.channel.ChannelConverter;
-import com.sprint.mission.discodeit.service.channel.ChannelService;
-import java.util.Optional;
-import org.junit.jupiter.api.BeforeEach;
-import org.junit.jupiter.api.Test;
-import org.mockito.Mock;
-import org.mockito.MockitoAnnotations;
-
-class JCFChannelServiceTest {
-    private ChannelService channelService;
-    @Mock
-    private ChannelRepository channelRepository;
-    @Mock
-    private UserRepository userRepository;
-
-    private ChannelConverter channelConverter = new ChannelConverter();
-    @BeforeEach
-    void setUp() {
-        MockitoAnnotations.openMocks(this);
-
-        channelService = JCFChannelService.getInstance(userRepository, channelRepository);
-    }
-
-
-    // createChannelOrThrow 테스트 => uuid 값이 수정할 수 없어서 테스트하는데 너무 어려움을 느낌..
-    @Test
-    void test() {
-        // given
-        var user = User.createFrom("SB_1기_백재우");
-        var channelName = "스프링백엔드_1기";
-        var channel = Channel.createOfChannelNameAndUser(channelName, user);
-        // when
-        var request = new CreateNewChannelRequest(user.getId(), channelName);
-        when(userRepository.findById(user.getId())).thenReturn(Optional.of(user));
-        // then
-        channelService.createChannelOrThrow(request);
-
-        verify(userRepository, times(1)).findById(user.getId());
-    }
-}
\ No newline at end of file
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/service/jcf/JCFUserServiceTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/service/jcf/JCFUserServiceTest.java
deleted file mode 100644
index 0300965b4..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/service/jcf/JCFUserServiceTest.java
+++ /dev/null
@@ -1,131 +0,0 @@
-package com.sprint.mission.discodeit.service.jcf;
-
-import static com.sprint.mission.discodeit.entity.common.Status.MODIFIED;
-import static com.sprint.mission.discodeit.entity.common.Status.REGISTERED;
-import static com.sprint.mission.discodeit.entity.common.Status.UNREGISTERED;
-import static org.assertj.core.api.Assertions.assertThat;
-import static org.junit.jupiter.api.Assertions.assertAll;
-import static org.mockito.ArgumentMatchers.any;
-import static org.mockito.Mockito.mock;
-import static org.mockito.Mockito.verify;
-import static org.mockito.Mockito.when;
-
-import com.sprint.mission.discodeit.repository.jcf.user.UserRepository;
-import com.sprint.mission.discodeit.entity.user.dto.FindUserRequest;
-import com.sprint.mission.discodeit.entity.user.dto.ModifyUserInfoRequest;
-import com.sprint.mission.discodeit.entity.user.dto.RegisterUserRequest;
-import com.sprint.mission.discodeit.entity.user.dto.UnregisterUserRequest;
-import com.sprint.mission.discodeit.entity.user.entity.User;
-import com.sprint.mission.discodeit.service.user.UserConverter;
-import java.util.Optional;
-import org.junit.jupiter.api.BeforeEach;
-import org.junit.jupiter.api.DisplayName;
-import org.junit.jupiter.api.Test;
-
-@DisplayName("UserInterface smoke testing")
-class JCFUserServiceTest {
-    private static final String NAME = "SB_1기_백재우";
-
-    private UserRepository userRepository;
-    private UserConverter userConverter;
-    private JCFUserService userService;
-    private User user;
-
-    @BeforeEach
-    void setUp() {
-        userRepository = mock(UserRepository.class);
-        userConverter = UserConverter.getInstance();
-        userService = new JCFUserService(userRepository, userConverter);
-        user = User.createFrom(NAME);
-    }
-
-    @Test
-    @DisplayName("유저 등록 userService register 호출 시 userInfoResponse 반환")
-    void givenNewUserRequestWhenRegisterThenReturnUserInfoResponse() {
-        // given
-        RegisterUserRequest registerUserRequest = new RegisterUserRequest(NAME);
-        var registerUser = userConverter.toEntity(registerUserRequest);
-        when(userRepository.save(any(User.class))).thenReturn(registerUser);
-
-        // when
-        var infoResponse = userService.register(registerUserRequest);
-
-        // then
-        assertAll(
-                () -> {
-                    assertThat(infoResponse).isNotNull();
-
-                    assertAll(
-                            () -> assertThat(infoResponse.username()).isEqualTo(NAME),
-                            () -> assertThat(infoResponse.status()).isEqualTo(REGISTERED)
-                    );
-                }
-        );
-        verify(userRepository).save(any(User.class));
-    }
-
-    @Test
-    @DisplayName("유저 이름으로 findUserByUsername 호출 시 UserResponse 반환")
-    void givenUsernameWhenFindUserByUsernameThenReturnUserInfoResponse() {
-        // given
-        Optional<User> mockUser = Optional.of(user);
-        var findUserRequest = new FindUserRequest(NAME);
-        when(userRepository.findByUsername(NAME)).thenReturn(mockUser);
-
-        // when
-        var user = userService.findUserByUsernameOrThrow(findUserRequest);
-
-        // then
-        assertThat(user).isNotNull();
-        assertThat(user.username()).isEqualTo(NAME);
-
-        verify(userRepository).findByUsername(NAME);
-    }
-    // TODO : 해지된 유지이름으로 조회 시 실패 테스트
-
-    @Test
-    @DisplayName("유저 정보 수정 modifyUserInfo 호출 시 UserResponse 반환")
-    void givenModifyUserInfoRequestWhenModifyUserInfoThenReturnUserInfoResponse() {
-        // given
-        var modifyUserInfoRequest = new ModifyUserInfoRequest(user.getId(), "CHANGE NAME");
-        when(userRepository.findById(user.getId())).thenReturn(Optional.of(user));
-        when(userRepository.save(any(User.class))).thenReturn(user);
-
-        // when
-        var userInfoResponse = userService.modifyUserInfo(modifyUserInfoRequest);
-
-        // then
-        assertAll(
-                () -> {
-                    assertThat(userInfoResponse).isNotNull();
-
-                    assertAll(
-                            () -> assertThat(userInfoResponse.status()).isEqualTo(MODIFIED),
-                            () -> assertThat(userInfoResponse.username()).isEqualTo("CHANGE NAME")
-                    );
-                }
-        );
-
-        verify(userRepository).save(any(User.class));
-        verify(userRepository).findById(user.getId());
-    }
-
-    // 탈퇴
-    @Test
-    @DisplayName("유저 회원 탈퇴 unregister 호출 시 유저 상태 변경")
-    void givenUnregisterUserRequestWhenUnregisterThenUserStatusIsChanged() {
-        // given
-        var unregisterUserRequest = new UnregisterUserRequest(user.getId(), NAME);
-        when(userRepository.findById(user.getId())).thenReturn(Optional.of(user));
-        when(userRepository.save(any(User.class))).thenReturn(user);
-
-        // when
-        userService.UnRegisterUser(unregisterUserRequest);
-
-        // then
-        assertThat(user.getStatus()).isEqualTo(UNREGISTERED);
-        verify(userRepository).findById(user.getId());
-        verify(userRepository).save(any(User.class));
-    }
-
-}
\ No newline at end of file
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/testdummy/TestDummyFactory.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/testdummy/TestDummyFactory.java
deleted file mode 100644
index 1900c89da..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/testdummy/TestDummyFactory.java
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.sprint.mission.discodeit.testdummy;
-
-import com.sprint.mission.discodeit.repository.jcf.user.UserRepository;
-import com.sprint.mission.discodeit.repository.jcf.user.JCFUserRepositoryInMemory;
-import com.sprint.mission.discodeit.entity.user.entity.User;
-import java.util.ArrayList;
-import java.util.List;
-
-public class TestDummyFactory {
-
-    private static final List<User> users = new ArrayList<>(List.of(
-            User.createFrom("홍길동"),
-            User.createFrom("김길동"),
-            User.createFrom("이길동"),
-            User.createFrom("박깅동")
-    ));
-
-
-    public static UserRepository getUserRepository() {
-        var userRepository = JCFUserRepositoryInMemory.getInstance();
-        users.forEach(userRepository::save);
-        return userRepository;
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/testdummy/TestDummyInMemoryCurdRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/testdummy/TestDummyInMemoryCurdRepository.java
deleted file mode 100644
index 4cf3aa25e..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/testdummy/TestDummyInMemoryCurdRepository.java
+++ /dev/null
@@ -1,7 +0,0 @@
-package com.sprint.mission.discodeit.testdummy;
-
-import com.sprint.mission.discodeit.repository.common.InMemoryCrudRepository;
-import java.util.UUID;
-
-public class TestDummyInMemoryCurdRepository extends InMemoryCrudRepository<TestUUIDEntity, UUID> {
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/testdummy/TestUUIDEntity.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/testdummy/TestUUIDEntity.java
deleted file mode 100644
index 2fd8a5f6a..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/testdummy/TestUUIDEntity.java
+++ /dev/null
@@ -1,6 +0,0 @@
-package com.sprint.mission.discodeit.testdummy;
-
-import com.sprint.mission.discodeit.entity.common.BaseEntity;
-
-public class TestUUIDEntity extends BaseEntity {
-}
diff --git "a/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md" "b/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md"
new file mode 100644
index 000000000..20505769a
--- /dev/null
+++ "b/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md"	
@@ -0,0 +1,24 @@
+# Domain Modeling
+디스코드 서비스를 활용하면서 각 도메인 모델에 필요한 정보를 도출한다.
+
+
+- User
+- Channel
+- Message
+
+## 유저
+
+- 회원 가입
+  - `이메일`, `별명`, `사용자명`, `비밀번호`, `생년월일`, `수신여부` 를 입력받는다.
+    - 별명 : 다른 회원에게 보여지는 이름입니다. 이모지 사용가능합니다.
+      - 서버마다 다르게 설정가능
+      - 최소 1~ 최대 32자
+    - 사용자명: 숫자,밑줄 _, 마침표, 문자
+      - 길이제한: 최소 2 ~ 최대 32자
+      - 사용가능문자 : 영문(a-z, A-z), 숫자(0-9), 밑줄(_), 마침표(.)
+      - 금지된 문자: 공백, 특수문자, 이모지, 연속된마침표, 마침표로 시작하거나 끝나는것
+      - 대소문자 구분없음 -> 중복 방지를 위해 모두 소문자로 변환하여 저장함
+      - 유저이름은 고유
+      - 특정 문자 단어제한 : discord, admin, moderator, 욕설
+    - 비밀번호: 필수, 개수 제한 5미만 x 
+    - 생년월일: 필수, 13세 이상만 사용가능
\ No newline at end of file

From 004294a7c7ed8577e476114b4fdd1c1af8f3df9e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?=
 <157946706+jaewoo9797@users.noreply.github.com>
Date: Thu, 6 Feb 2025 18:51:03 +0900
Subject: [PATCH 05/38] docs: change branch for push remote my all branch

---
 .github/workflows/sprint-mission1-pr-test.yml                  | 2 +-
 .../domain/user/validation/UsernameValidatorTest.java          | 3 ---
 2 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/.github/workflows/sprint-mission1-pr-test.yml b/.github/workflows/sprint-mission1-pr-test.yml
index 893253cb7..1799da75f 100644
--- a/.github/workflows/sprint-mission1-pr-test.yml
+++ b/.github/workflows/sprint-mission1-pr-test.yml
@@ -3,7 +3,7 @@ name: sprint mission 1 PR Test
 on:
   push:
     branches:
-      - 'part1-백재우-sprint1'
+      - '*'
   pull_request:
     branches:
       - 'part1-백재우'
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/UsernameValidatorTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/UsernameValidatorTest.java
index 503782dd9..37729f2c9 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/UsernameValidatorTest.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/UsernameValidatorTest.java
@@ -1,11 +1,8 @@
 package com.sprint.mission.discodeit.domain.user.validation;
 
-import static org.junit.jupiter.api.Assertions.*;
-
 import com.sprint.mission.discodeit.domain.user.exception.UserNameInvalidException;
 import java.util.stream.Stream;
 import org.assertj.core.api.Assertions;
-import org.junit.jupiter.api.Test;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.MethodSource;
 import org.junit.jupiter.params.provider.NullAndEmptySource;

From 1b1848b6314496b5a2251091f84d9428c4077ea4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?=
 <157946706+jaewoo9797@users.noreply.github.com>
Date: Fri, 7 Feb 2025 14:40:57 +0900
Subject: [PATCH 06/38] =?UTF-8?q?feat:=20=EC=83=9D=EB=85=84=EC=9B=94?=
 =?UTF-8?q?=EC=9D=BC=20=EA=B8=B0=EB=8A=A5=20=EA=B5=AC=ED=98=84?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

생각해 볼 부분, 현재 static 으로 정적메서드가 많이 존재하는데, 검증해야하는 부분들이 많아질 경우 어떻게 할 것인가? 장단점 생각해보기

검증하는 로직을 외부 객체로 진행하게 된다면, 장단점 생각해보기
---
 .../discodeit/domain/user/BirthDate.java      | 13 ++++--
 .../mission/discodeit/domain/user/Email.java  |  2 +-
 .../discodeit/domain/user/Nickname.java       |  2 +-
 .../discodeit/domain/user/Password.java       | 10 +++--
 .../discodeit/domain/user/Username.java       |  2 +-
 .../exception/BirthDateInvalidException.java  | 12 ++++++
 .../user/validation/BirthDateValidator.java   | 21 +++++++++
 .../user/validation/EmailValidator.java       |  5 ++-
 .../user/validation/NicknameValidator.java    | 13 +++++-
 .../user/validation/PasswordValidator.java    | 27 ++++++++++++
 .../user/validation/UsernameValidator.java    |  2 +-
 .../discodeit/global/error/ErrorCode.java     |  2 +
 .../discodeit/domain/user/PasswordTest.java   | 35 +++++++++++++++
 .../discodeit/domain/user/UsernameTest.java   |  2 +-
 .../validation/BirthDateValidatorTest.java    | 18 ++++++++
 .../validation/NicknameValidatorTest.java     |  1 +
 .../validation/PasswordValidatorTest.java     | 43 +++++++++++++++++++
 .../validation/UsernameValidatorTest.java     |  2 +-
 ...0 \353\252\250\353\215\270\353\247\201.md" |  2 +-
 19 files changed, 196 insertions(+), 18 deletions(-)
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/exception/BirthDateInvalidException.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/BirthDateValidator.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/PasswordValidator.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/PasswordTest.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/BirthDateValidatorTest.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/PasswordValidatorTest.java

diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/BirthDate.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/BirthDate.java
index ff4f2883f..411cec7b1 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/BirthDate.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/BirthDate.java
@@ -1,16 +1,21 @@
 package com.sprint.mission.discodeit.domain.user;
 
+import com.sprint.mission.discodeit.domain.user.validation.BirthDateValidator;
 import java.time.LocalDate;
+import lombok.Getter;
 
+@Getter
 public class BirthDate {
 
     private final LocalDate value;
 
-    public BirthDate(int year, int month, int day) {
-        this.value = LocalDate.of(year, month, day);
+    public BirthDate(LocalDate value) {
+        BirthDateValidator.validate(value);
+        this.value = value;
     }
 
-    public LocalDate getValue() {
-        return value;
+    public static BirthDate of(int year, int month, int day) {
+        return new BirthDate(LocalDate.of(year, month, day));
     }
+
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Email.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Email.java
index 7ec6f463b..f8d1cdbe3 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Email.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Email.java
@@ -14,6 +14,6 @@ public class Email {
 
     public Email(String email) {
         EmailValidator.valid(email);
-        this.value = email.trim();
+        this.value = email;
     }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Nickname.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Nickname.java
index 283f2cb4d..9b488f3dd 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Nickname.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Nickname.java
@@ -14,7 +14,7 @@ public class Nickname {
 
     public Nickname(String value) {
         NicknameValidator.validate(value);
-        this.value = value.trim();
+        this.value = value;
     }
 
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Password.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Password.java
index 8eb906f79..9ece7c363 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Password.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Password.java
@@ -1,14 +1,18 @@
 package com.sprint.mission.discodeit.domain.user;
 
+import com.sprint.mission.discodeit.domain.user.validation.PasswordValidator;
+import lombok.Getter;
+import lombok.ToString;
+
+@Getter
+@ToString(of = "value")
 public class Password {
 
     private final String value;
 
     public Password(String value) {
+        PasswordValidator.validate(value);
         this.value = value;
     }
 
-    public String getValue() {
-        return value;
-    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Username.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Username.java
index f4b7d4da1..5ca240fc7 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Username.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Username.java
@@ -14,7 +14,7 @@ public class Username {
 
     public Username(String value) {
         UsernameValidator.validate(value);
-        this.value = value.trim();
+        this.value = value.toLowerCase();
     }
 
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/exception/BirthDateInvalidException.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/exception/BirthDateInvalidException.java
new file mode 100644
index 000000000..423e9dcac
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/exception/BirthDateInvalidException.java
@@ -0,0 +1,12 @@
+package com.sprint.mission.discodeit.domain.user.exception;
+
+import com.sprint.mission.discodeit.global.error.ErrorCode;
+import com.sprint.mission.discodeit.global.error.exception.InvalidException;
+
+public class BirthDateInvalidException extends InvalidException {
+
+    public BirthDateInvalidException(ErrorCode errorCode, String message) {
+        super(errorCode, message);
+    }
+
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/BirthDateValidator.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/BirthDateValidator.java
new file mode 100644
index 000000000..cf8469d30
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/BirthDateValidator.java
@@ -0,0 +1,21 @@
+package com.sprint.mission.discodeit.domain.user.validation;
+
+import com.sprint.mission.discodeit.domain.user.exception.BirthDateInvalidException;
+import com.sprint.mission.discodeit.global.error.ErrorCode;
+import java.time.LocalDate;
+import java.util.Objects;
+
+public class BirthDateValidator {
+    private static final int MIN_AGE_RESTRICT = 13;
+
+    public static void validate(LocalDate birthDate) {
+        if (Objects.isNull(birthDate)) {
+            throw new BirthDateInvalidException(ErrorCode.BIRTHDATE_REQUIRED, "");
+        }
+
+        LocalDate minimumAllowedYear = LocalDate.now().minusYears(MIN_AGE_RESTRICT);
+        if (!birthDate.isBefore(minimumAllowedYear)) {
+            throw new BirthDateInvalidException(ErrorCode.UNDERAGE_SIGNUP_REGISTERED, birthDate.toString());
+        }
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/EmailValidator.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/EmailValidator.java
index 22549af1d..53844f0e6 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/EmailValidator.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/EmailValidator.java
@@ -14,10 +14,11 @@ public class EmailValidator {
 
 
     public static void valid(String email) {
-        if (Objects.isNull(email)) {
+        if (Objects.isNull(email) || email.isBlank()) {
             throw new EmailInvalidException(ErrorCode.EMAIL_REQUIRED, "");
         }
-        if (email.isBlank() || !EMAIL_PATTERN.matcher(email).matches()) {
+
+        if (!EMAIL_PATTERN.matcher(email).matches()) {
             throw new EmailInvalidException(ErrorCode.INVALID_EMAIL_FORMAT, email);
         }
 
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/NicknameValidator.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/NicknameValidator.java
index c741fc717..3a39a8a4f 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/NicknameValidator.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/NicknameValidator.java
@@ -4,6 +4,7 @@
 import com.sprint.mission.discodeit.global.error.ErrorCode;
 import java.util.Objects;
 import java.util.Set;
+import java.util.regex.Pattern;
 
 public class NicknameValidator {
     private static final int MAX_LENGTH = 32;
@@ -12,15 +13,23 @@ public class NicknameValidator {
             "운영자", "관리자", "봇"
     );
 
+    private static final String VALID_NICK_NAME_REGEX =
+            "^(?!.*\\s)[\\p{L}\\p{N}\\p{P}\\p{S}\\p{So}]{1,32}$\n";
+    private static final Pattern VALID_NICK_NAME_PATTERN = Pattern.compile(VALID_NICK_NAME_REGEX);
+
     public static void validate(String value) {
-        if (Objects.isNull(value)) {
+        if (Objects.isNull(value) || value.isBlank()) {
             throw new NickNameInvalidException(ErrorCode.NICKNAME_REQUIRED, "");
         }
 
-        if (value.isBlank() || value.length() > MAX_LENGTH) {
+        if (value.length() > MAX_LENGTH) {
             throw new NickNameInvalidException(ErrorCode.INVALID_NICKNAME_LENGTH, value);
         }
 
+        if (!VALID_NICK_NAME_PATTERN.matcher(value).matches()) {
+            throw new NickNameInvalidException(ErrorCode.INVALID_NICKNAME_FORMAT, value);
+        }
+
         String lowerCase = value.toLowerCase();
         for (String word : FORBIDDEN_WORDS) {
             if (lowerCase.contains(word)) {
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/PasswordValidator.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/PasswordValidator.java
new file mode 100644
index 000000000..64af5213f
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/PasswordValidator.java
@@ -0,0 +1,27 @@
+package com.sprint.mission.discodeit.domain.user.validation;
+
+import com.sprint.mission.discodeit.domain.user.exception.PassWordInvalidException;
+import com.sprint.mission.discodeit.global.error.ErrorCode;
+import java.util.Objects;
+import java.util.regex.Pattern;
+
+public class PasswordValidator {
+    private final static int MAX_PASSWORD_LENGTH = 100;
+    private final static int MIN_PASSWORD_LENGTH = 8;
+    private final static String PASSWORD_REX = "^(?=.*[A-Z])(?=.*[0-9])(?=.*[a-z])(?=.*[!@#$%^&*()_+])\\S{8,}$";
+    private final static Pattern PASSWORD_PATTERN = Pattern.compile(PASSWORD_REX);
+
+    public static void validate(String password) {
+        if (Objects.isNull(password) || password.isEmpty()) {
+            throw new PassWordInvalidException(ErrorCode.PASSWORD_REQUIRED, "");
+        }
+
+        if (password.length() < MIN_PASSWORD_LENGTH || password.length() > MAX_PASSWORD_LENGTH) {
+            throw new PassWordInvalidException(ErrorCode.INVALID_PASSWORD_LENGTH, password);
+        }
+
+        if (!PASSWORD_PATTERN.matcher(password).matches()) {
+            throw new PassWordInvalidException(ErrorCode.WEAK_PASSWORD, password);
+        }
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/UsernameValidator.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/UsernameValidator.java
index e373bffdd..679a8b9b0 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/UsernameValidator.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/UsernameValidator.java
@@ -20,7 +20,7 @@ public class UsernameValidator {
 
 
     public static void validate(final String username) {
-        if (Objects.isNull(username)) {
+        if (Objects.isNull(username) || username.isBlank()) {
             throw new UserNameInvalidException(ErrorCode.USERNAME_REQUIRED, "");
         }
 
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorCode.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorCode.java
index 250ab4e6a..e703ecb7b 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorCode.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorCode.java
@@ -8,11 +8,13 @@ public enum ErrorCode {
     INVALID_NICKNAME_LENGTH(400, "유저 이름은 2~32자 이내여야 합니다.", "U002"),
     INVALID_PASSWORD_LENGTH(400, "비밀번호는 8~20자 이내여야 합니다.", "U004"),  // 비밀번호 길이 오류
     WEAK_PASSWORD(400, "비밀번호는 대문자, 숫자, 특수문자를 포함해야 합니다.", "U008"),
+    UNDERAGE_SIGNUP_REGISTERED(400, "13세 이상만 회원가입이 가능합니다.", "U009"),
 
     USERNAME_REQUIRED(400, "유저 이름은 필수입니다.", "U104"),
     NICKNAME_REQUIRED(400, "닉네임은 필수입니다.", "U105"),
     EMAIL_REQUIRED(400, "이메일은 필수입니다.", "U106"),
     PASSWORD_REQUIRED(400, "비밀번호는 필수 입력값입니다.", "U107"),
+    BIRTHDATE_REQUIRED(400, "생년월일은 필수 입력값입니다.", "U108"),
 
     INVALID_EMAIL_FORMAT(400, "이메일 형식이 올바르지 않습니다", "U203"),
     INVALID_USERNAME_FORMAT(400, "유저 이름에 허용되지 않은 문자가 포함되어 있습니다.", "U205"),
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/PasswordTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/PasswordTest.java
new file mode 100644
index 000000000..56c902d3a
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/PasswordTest.java
@@ -0,0 +1,35 @@
+package com.sprint.mission.discodeit.domain.user;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+class PasswordTest {
+
+    @ParameterizedTest
+    @ValueSource(strings = {
+            "A1b@5678",       // 최소 길이(8) 만족
+            "Secure#99",      // 대문자+소문자+숫자+특수문자 포함
+            "StrongP@ssw0rd", // 일반적인 강력한 비밀번호
+            "Aa1!Aa1!Aa1!",   // 패턴 반복
+            "P@55w0rD2024",   // 숫자 포함된 조합
+            "Valid123!@#",    // 숫자 + 특수문자 여러 개 포함
+            "Pass1234!",      // 일반적인 패턴
+            "LONGpassword123$LongPassword", // 대문자, 소문자, 숫자, 특수문자 포함 (길이 32자)
+            "Xx1!yY2@zZ3#",   // 랜덤한 조합
+            "C0mpl!c@tedPwd99$", // 다양한 조합
+            "ABCDEFGh1@",     // 대문자 여러 개, 소문자 하나 포함
+            "abcdEFG123$",    // 대소문자, 숫자, 특수문자 조합
+            "1Password!",     // 일반적인 패턴
+            "P@ssw0rddSecure123!", // 긴 길이 (최대 100자는 넘지 않음)
+    })
+    void 비밀번호_생성_성공(String password) {
+        //given
+        // when
+        Password createdPassword = new Password(password);
+        // then
+        assertThat(createdPassword.getValue()).isEqualTo(password);
+    }
+
+}
\ No newline at end of file
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/UsernameTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/UsernameTest.java
index ce1708b01..90ce0115b 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/UsernameTest.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/UsernameTest.java
@@ -24,7 +24,7 @@ class UsernameTest {
         // when
         Username createUsername = new Username(username);
         // then
-        assertThat(createUsername.getValue()).isEqualTo(username);
+        assertThat(createUsername.getValue()).isEqualToIgnoringCase(username);
     }
 
 }
\ No newline at end of file
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/BirthDateValidatorTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/BirthDateValidatorTest.java
new file mode 100644
index 000000000..6242d8416
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/BirthDateValidatorTest.java
@@ -0,0 +1,18 @@
+package com.sprint.mission.discodeit.domain.user.validation;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+
+class BirthDateValidatorTest {
+
+    @Test
+    void 나이_13세_미만_생성검증_에러throw() {
+        //given
+
+        // when
+
+        // then
+    }
+
+}
\ No newline at end of file
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/NicknameValidatorTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/NicknameValidatorTest.java
index 3b7bdad9d..afbd5b4a6 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/NicknameValidatorTest.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/NicknameValidatorTest.java
@@ -26,6 +26,7 @@ class NicknameValidatorTest {
             "hello admin!",       // 금지된 단어 포함
             "AdminUser",          // 금지된 단어 포함 (대소문자 무시)
             "DISCORD🔥",         // 금지된 단어 포함 (대소문자 무시)
+            "papago good",
             "root_user",          // 금지된 단어 포함 (관리자 권한 관련)
             "system_mod",         // 금지된 단어 포함
             "운영자",              // 한글 운영자 금지
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/PasswordValidatorTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/PasswordValidatorTest.java
new file mode 100644
index 000000000..b7cbcdd37
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/PasswordValidatorTest.java
@@ -0,0 +1,43 @@
+package com.sprint.mission.discodeit.domain.user.validation;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.catchThrowable;
+
+import com.sprint.mission.discodeit.domain.user.exception.PassWordInvalidException;
+import java.util.stream.Stream;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
+import org.junit.jupiter.params.provider.NullAndEmptySource;
+import org.junit.jupiter.params.provider.ValueSource;
+
+class PasswordValidatorTest {
+
+    @ParameterizedTest
+    @NullAndEmptySource
+    @MethodSource("passwordOverLengthProvider")
+    @ValueSource(strings = {
+            "Ab1!",          // 8자 미만
+            "password1!",    // 대문자 없음
+            "PASSWORD1!",    // 소문자 없음
+            "Password!",     // 숫자 없음
+            "Password1",     // 특수문자 없음
+            "Password 1!",   // 공백 포함
+            "Password1한",   // 한글 포함
+            "12345678!",     // 숫자 + 특수문자만 (영문 없음)
+            "ABCDEFGH1!",    // 대문자 + 숫자 + 특수문자만 (소문자 없음)
+            "abcdefgh1!",    // 소문자 + 숫자 + 특수문자만 (대문자 없음)
+            "Password blanck",
+    })
+    void 비밀번호_정규식_생성_검증_에러throw(String password) {
+        //given
+        // when
+        Throwable catchThrow = catchThrowable(() -> PasswordValidator.validate(password));
+        // then
+        assertThat(catchThrow).isInstanceOf(PassWordInvalidException.class);
+    }
+
+    static Stream<String> passwordOverLengthProvider() {
+        return Stream.of("A1!a".repeat(26));
+    }
+
+}
\ No newline at end of file
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/UsernameValidatorTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/UsernameValidatorTest.java
index 37729f2c9..975c06466 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/UsernameValidatorTest.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/UsernameValidatorTest.java
@@ -36,7 +36,7 @@ class UsernameValidatorTest {
             "봇",                     // 봇 계정 금지
     })
     @MethodSource("usernameOverLengthProvider")
-    void testMethodNameHere(String username) {
+    void 유저_이름_제한_검증_에러throw(String username) {
         //given
         // when
         Throwable catchThrowable = Assertions.catchThrowable(() -> UsernameValidator.validate(username));
diff --git "a/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md" "b/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md"
index 20505769a..b1a4833b9 100644
--- "a/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md"	
+++ "b/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md"	
@@ -20,5 +20,5 @@
       - 대소문자 구분없음 -> 중복 방지를 위해 모두 소문자로 변환하여 저장함
       - 유저이름은 고유
       - 특정 문자 단어제한 : discord, admin, moderator, 욕설
-    - 비밀번호: 필수, 개수 제한 5미만 x 
+    - 비밀번호: 필수, 개수 제한 8미만 x , 영문 대문자, 소문자, 숫자, 특수문자가 들어가야합니다. 공백 x
     - 생년월일: 필수, 13세 이상만 사용가능
\ No newline at end of file

From 59261adefb9cae90e2b253eaf64875b499723b2d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?= <9712jw@gmail.com>
Date: Fri, 7 Feb 2025 20:53:32 +0900
Subject: [PATCH 07/38] =?UTF-8?q?refactor=20:=20=EB=B6=88=ED=95=84?=
 =?UTF-8?q?=EC=9A=94=ED=95=9C=20=EA=B0=9C=ED=96=89=EB=AC=B8=EC=9E=90=20?=
 =?UTF-8?q?=EC=82=AD=EC=A0=9C?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../discodeit/domain/user/validation/NicknameValidator.java     | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/NicknameValidator.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/NicknameValidator.java
index 3a39a8a4f..bdc8b656d 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/NicknameValidator.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/NicknameValidator.java
@@ -14,7 +14,7 @@ public class NicknameValidator {
     );
 
     private static final String VALID_NICK_NAME_REGEX =
-            "^(?!.*\\s)[\\p{L}\\p{N}\\p{P}\\p{S}\\p{So}]{1,32}$\n";
+            "^(?!.*\\s)[\\p{L}\\p{N}\\p{P}\\p{S}\\p{So}]{1,32}$";
     private static final Pattern VALID_NICK_NAME_PATTERN = Pattern.compile(VALID_NICK_NAME_REGEX);
 
     public static void validate(String value) {

From cb2ba91ee83dec1b539432d6d4ec58b831b7f303 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?= <9712jw@gmail.com>
Date: Fri, 7 Feb 2025 22:04:04 +0900
Subject: [PATCH 08/38] =?UTF-8?q?feat:=20user=20join=20feature=20=EA=B5=AC?=
 =?UTF-8?q?=ED=98=84?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../application/dto/JoinUserReqeustDto.java   | 16 +++++++
 .../application/dto/UserResponseDto.java      |  9 ++++
 .../application/service/UserService.java      | 33 ++++++++++++++
 .../service/converter/UserConverter.java      | 31 +++++++++++++
 .../mission/discodeit/domain/user/User.java   | 44 +++++++------------
 .../user/InMemoryUserRepository.java          | 30 +++++++++++++
 .../user/interfaces/UserRepository.java       | 11 +++++
 ...0 \353\252\250\353\215\270\353\247\201.md" |  3 +-
 8 files changed, 147 insertions(+), 30 deletions(-)
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/JoinUserReqeustDto.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/UserResponseDto.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/UserService.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/converter/UserConverter.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/InMemoryUserRepository.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/interfaces/UserRepository.java

diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/JoinUserReqeustDto.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/JoinUserReqeustDto.java
new file mode 100644
index 000000000..b6cbf36c8
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/JoinUserReqeustDto.java
@@ -0,0 +1,16 @@
+package com.sprint.mission.discodeit.application.dto;
+
+import jakarta.validation.constraints.Email;
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.NotNull;
+import java.time.LocalDate;
+
+public record JoinUserReqeustDto(
+    @NotBlank String nickname,
+    @NotBlank String username,
+    @Email String email,
+    @NotBlank String password,
+    @NotNull LocalDate birthDate
+) {
+
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/UserResponseDto.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/UserResponseDto.java
new file mode 100644
index 000000000..dbe8eb232
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/UserResponseDto.java
@@ -0,0 +1,9 @@
+package com.sprint.mission.discodeit.application.dto;
+
+public record UserResponseDto(
+    String nickname,
+    String username,
+    String email
+) {
+
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/UserService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/UserService.java
new file mode 100644
index 000000000..fd6f05b2e
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/UserService.java
@@ -0,0 +1,33 @@
+package com.sprint.mission.discodeit.application.service;
+
+import com.sprint.mission.discodeit.application.dto.JoinUserReqeustDto;
+import com.sprint.mission.discodeit.application.dto.UserResponseDto;
+import com.sprint.mission.discodeit.application.service.converter.UserConverter;
+import com.sprint.mission.discodeit.domain.user.Email;
+import com.sprint.mission.discodeit.domain.user.User;
+import com.sprint.mission.discodeit.repository.user.interfaces.UserRepository;
+import org.springframework.stereotype.Service;
+
+@Service
+public class UserService {
+
+    private final UserRepository userRepository;
+    private final UserConverter userConverter;
+
+    public UserService(
+        UserRepository userRepository,
+        UserConverter userConverter
+    ) {
+        this.userRepository = userRepository;
+        this.userConverter = userConverter;
+    }
+
+    public UserResponseDto join(JoinUserReqeustDto requestDto) {
+        boolean isExist = userRepository.isExistByEmail(new Email(requestDto.email()));
+        if (isExist) {
+            throw new IllegalArgumentException();
+        }
+        User savedUser = userRepository.save(userConverter.toUser(requestDto));
+        return userConverter.toDto(savedUser);
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/converter/UserConverter.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/converter/UserConverter.java
new file mode 100644
index 000000000..06d4671b2
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/converter/UserConverter.java
@@ -0,0 +1,31 @@
+package com.sprint.mission.discodeit.application.service.converter;
+
+import com.sprint.mission.discodeit.application.dto.JoinUserReqeustDto;
+import com.sprint.mission.discodeit.application.dto.UserResponseDto;
+import com.sprint.mission.discodeit.domain.user.BirthDate;
+import com.sprint.mission.discodeit.domain.user.Email;
+import com.sprint.mission.discodeit.domain.user.Nickname;
+import com.sprint.mission.discodeit.domain.user.Password;
+import com.sprint.mission.discodeit.domain.user.User;
+import com.sprint.mission.discodeit.domain.user.Username;
+import com.sprint.mission.discodeit.domain.user.enums.EmailSubscriptionStatus;
+import org.springframework.stereotype.Component;
+
+@Component
+public class UserConverter {
+
+    public User toUser(JoinUserReqeustDto requestDto) {
+        return User.builder()
+            .username(new Username(requestDto.username()))
+            .nickname(new Nickname(requestDto.nickname()))
+            .email(new Email(requestDto.email()))
+            .password(new Password(requestDto.password()))
+            .birthDate(new BirthDate(requestDto.birthDate()))
+            .emailSubscriptionStatus(EmailSubscriptionStatus.UNSUBSCRIBED)  // TODO 이넘 타입 dto에서 어떻게 받아서 넘겨야하나.
+            .build();
+    }
+
+    public UserResponseDto toDto(User user) {
+        return new UserResponseDto(user.getNicknameValue(),user.getUsernameValue(),user.getEmailValue());
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/User.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/User.java
index 0d07babfc..161b06e8e 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/User.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/User.java
@@ -4,12 +4,13 @@
 import java.time.LocalDateTime;
 import java.util.Objects;
 import java.util.UUID;
+import lombok.Builder;
 
 public class User {
 
     private final UUID id;
     private final Nickname nickname;
-    private final Nickname username;
+    private final Username username;
     private final Email email;
     private final Password password;
     private final BirthDate birthDate;
@@ -17,13 +18,14 @@ public class User {
     private final LocalDateTime updatedAt;
     private final EmailSubscriptionStatus emailSubscriptionStatus;
 
+    @Builder
     public User(
-            Nickname nickname,
-            Nickname username,
-            Email email,
-            Password password,
-            BirthDate birthDate,
-            EmailSubscriptionStatus emailSubscriptionStatus
+        Nickname nickname,
+        Username username,
+        Email email,
+        Password password,
+        BirthDate birthDate,
+        EmailSubscriptionStatus emailSubscriptionStatus
     ) {
         this.id = UUID.randomUUID();
         this.createdAt = LocalDateTime.now();
@@ -40,36 +42,20 @@ public UUID getId() {
         return id;
     }
 
-    public Nickname getNickname() {
-        return nickname;
-    }
-
     public Email getEmail() {
         return email;
     }
 
-    public LocalDateTime getCreatedAt() {
-        return createdAt;
-    }
-
-    public LocalDateTime getUpdatedAt() {
-        return updatedAt;
-    }
-
-    public Nickname getUsername() {
-        return username;
-    }
-
-    public Password getPassword() {
-        return password;
+    public String getUsernameValue() {
+        return this.username.getValue();
     }
 
-    public BirthDate getBirthDate() {
-        return birthDate;
+    public String getNicknameValue() {
+        return this.nickname.getValue();
     }
 
-    public EmailSubscriptionStatus getEmailSubscriptionStatus() {
-        return emailSubscriptionStatus;
+    public String getEmailValue() {
+        return this.email.getValue();
     }
 
     @Override
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/InMemoryUserRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/InMemoryUserRepository.java
new file mode 100644
index 000000000..45b41edf7
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/InMemoryUserRepository.java
@@ -0,0 +1,30 @@
+package com.sprint.mission.discodeit.repository.user;
+
+import com.sprint.mission.discodeit.domain.user.Email;
+import com.sprint.mission.discodeit.domain.user.User;
+import com.sprint.mission.discodeit.repository.user.interfaces.UserRepository;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+import java.util.UUID;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public class InMemoryUserRepository implements UserRepository {
+
+    Map<UUID, User> store = new HashMap<>();
+    Set<Email> emails = new HashSet<>();
+
+    @Override
+    public User save(User user) {
+        store.put(user.getId(),user);
+        emails.add(user.getEmail());
+        return user;
+    }
+
+    @Override
+    public boolean isExistByEmail(Email email) {
+        return emails.contains(email);
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/interfaces/UserRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/interfaces/UserRepository.java
new file mode 100644
index 000000000..b5f9af39a
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/interfaces/UserRepository.java
@@ -0,0 +1,11 @@
+package com.sprint.mission.discodeit.repository.user.interfaces;
+
+import com.sprint.mission.discodeit.domain.user.Email;
+import com.sprint.mission.discodeit.domain.user.User;
+
+public interface UserRepository {
+
+    User save(User user);
+
+    boolean isExistByEmail(Email email);
+}
diff --git "a/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md" "b/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md"
index b1a4833b9..79f42a541 100644
--- "a/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md"	
+++ "b/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md"	
@@ -21,4 +21,5 @@
       - 유저이름은 고유
       - 특정 문자 단어제한 : discord, admin, moderator, 욕설
     - 비밀번호: 필수, 개수 제한 8미만 x , 영문 대문자, 소문자, 숫자, 특수문자가 들어가야합니다. 공백 x
-    - 생년월일: 필수, 13세 이상만 사용가능
\ No newline at end of file
+    - 생년월일: 필수, 13세 이상만 사용가능
+  - 사용하고 있는 이메일인지 검증한다.

From 4c077b0133bce9910c1903b79487669ffa852184 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?= <9712jw@gmail.com>
Date: Fri, 7 Feb 2025 23:59:23 +0900
Subject: [PATCH 09/38] =?UTF-8?q?test:=20user=20service,=20repository=20?=
 =?UTF-8?q?=EB=A1=9C=EA=B7=B8=EC=9D=B8=20=EA=B8=B0=EB=8A=A5=20=ED=85=8C?=
 =?UTF-8?q?=EC=8A=A4=ED=8A=B8=20=EA=B5=AC=ED=98=84?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../application/service/UserService.java      | 15 ++++--
 .../mission/discodeit/domain/user/User.java   |  4 ++
 .../exception/AlreadyUserExistsException.java | 11 +++++
 .../user/InMemoryUserRepository.java          |  9 +++-
 .../user/interfaces/UserRepository.java       |  3 ++
 .../application/service/UserServiceTest.java  | 46 +++++++++++++++++++
 .../mission/discodeit/fake/FakeFactory.java   | 19 ++++++++
 .../discodeit/fake/domain/user/StubUser.java  | 43 +++++++++++++++++
 .../fake/repository/FakeUserRepository.java   | 36 +++++++++++++++
 .../user/interfaces/UserRepositoryTest.java   | 27 +++++++++++
 10 files changed, 209 insertions(+), 4 deletions(-)
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/exception/AlreadyUserExistsException.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/application/service/UserServiceTest.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/FakeFactory.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/domain/user/StubUser.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/repository/FakeUserRepository.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/repository/user/interfaces/UserRepositoryTest.java

diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/UserService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/UserService.java
index fd6f05b2e..d49aa1f7f 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/UserService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/UserService.java
@@ -5,6 +5,9 @@
 import com.sprint.mission.discodeit.application.service.converter.UserConverter;
 import com.sprint.mission.discodeit.domain.user.Email;
 import com.sprint.mission.discodeit.domain.user.User;
+import com.sprint.mission.discodeit.domain.user.Username;
+import com.sprint.mission.discodeit.domain.user.exception.AlreadyUserExistsException;
+import com.sprint.mission.discodeit.global.error.ErrorCode;
 import com.sprint.mission.discodeit.repository.user.interfaces.UserRepository;
 import org.springframework.stereotype.Service;
 
@@ -23,10 +26,16 @@ public UserService(
     }
 
     public UserResponseDto join(JoinUserReqeustDto requestDto) {
-        boolean isExist = userRepository.isExistByEmail(new Email(requestDto.email()));
-        if (isExist) {
-            throw new IllegalArgumentException();
+        boolean isEmailAlreadyUsed = userRepository.isExistByEmail(new Email(requestDto.email()));
+        if (isEmailAlreadyUsed) {
+            throw new AlreadyUserExistsException(ErrorCode.DUPLICATE_EMAIL, requestDto.email());
         }
+
+        boolean isUsernameAlreadyUsed = userRepository.isExistByUsername(new Username(requestDto.username()));
+        if (isUsernameAlreadyUsed) {
+            throw new AlreadyUserExistsException(ErrorCode.DUPLICATE_USERNAME, requestDto.username());
+        }
+
         User savedUser = userRepository.save(userConverter.toUser(requestDto));
         return userConverter.toDto(savedUser);
     }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/User.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/User.java
index 161b06e8e..be604a7be 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/User.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/User.java
@@ -42,6 +42,10 @@ public UUID getId() {
         return id;
     }
 
+    public Username getUsername() {
+        return username;
+    }
+
     public Email getEmail() {
         return email;
     }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/exception/AlreadyUserExistsException.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/exception/AlreadyUserExistsException.java
new file mode 100644
index 000000000..11d27f695
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/exception/AlreadyUserExistsException.java
@@ -0,0 +1,11 @@
+package com.sprint.mission.discodeit.domain.user.exception;
+
+import com.sprint.mission.discodeit.global.error.ErrorCode;
+import com.sprint.mission.discodeit.global.error.exception.InvalidException;
+
+public class AlreadyUserExistsException extends InvalidException {
+
+    public AlreadyUserExistsException(ErrorCode errorCode, String message) {
+        super(errorCode, message);
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/InMemoryUserRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/InMemoryUserRepository.java
index 45b41edf7..3fa60e569 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/InMemoryUserRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/InMemoryUserRepository.java
@@ -2,6 +2,7 @@
 
 import com.sprint.mission.discodeit.domain.user.Email;
 import com.sprint.mission.discodeit.domain.user.User;
+import com.sprint.mission.discodeit.domain.user.Username;
 import com.sprint.mission.discodeit.repository.user.interfaces.UserRepository;
 import java.util.HashMap;
 import java.util.HashSet;
@@ -15,10 +16,11 @@ public class InMemoryUserRepository implements UserRepository {
 
     Map<UUID, User> store = new HashMap<>();
     Set<Email> emails = new HashSet<>();
+    Set<Username> usernames = new HashSet<>();
 
     @Override
     public User save(User user) {
-        store.put(user.getId(),user);
+        store.put(user.getId(), user);
         emails.add(user.getEmail());
         return user;
     }
@@ -27,4 +29,9 @@ public User save(User user) {
     public boolean isExistByEmail(Email email) {
         return emails.contains(email);
     }
+
+    @Override
+    public boolean isExistByUsername(Username username) {
+        return usernames.contains(username);
+    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/interfaces/UserRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/interfaces/UserRepository.java
index b5f9af39a..a345c2425 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/interfaces/UserRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/interfaces/UserRepository.java
@@ -2,10 +2,13 @@
 
 import com.sprint.mission.discodeit.domain.user.Email;
 import com.sprint.mission.discodeit.domain.user.User;
+import com.sprint.mission.discodeit.domain.user.Username;
 
 public interface UserRepository {
 
     User save(User user);
 
     boolean isExistByEmail(Email email);
+
+    boolean isExistByUsername(Username username);
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/application/service/UserServiceTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/application/service/UserServiceTest.java
new file mode 100644
index 000000000..532a72f20
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/application/service/UserServiceTest.java
@@ -0,0 +1,46 @@
+package com.sprint.mission.discodeit.application.service;
+
+import com.sprint.mission.discodeit.application.dto.JoinUserReqeustDto;
+import com.sprint.mission.discodeit.domain.user.exception.AlreadyUserExistsException;
+import com.sprint.mission.discodeit.fake.FakeFactory;
+import com.sprint.mission.discodeit.fake.domain.user.StubUser;
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+class UserServiceTest {
+
+    private UserService userService;
+    private JoinUserReqeustDto joinUserReqeustDto = StubUser.generateJoinRequestDto();
+
+    @BeforeEach
+    void setup() {
+        userService = FakeFactory.getUserService();
+    }
+
+    @Test
+    void 회원가입_요청_메소드_호출_이미_존재하는_이메일_이면_에러throw() {
+        // given
+        userService.join(joinUserReqeustDto);
+        JoinUserReqeustDto anotherUsernameRequest = StubUser.generateJoinRequestByUsername("anotherusername");
+
+        // when
+        Throwable catchThrow = Assertions.catchThrowable(
+                () -> userService.join(anotherUsernameRequest));
+        // then
+        Assertions.assertThat(catchThrow).isInstanceOf(AlreadyUserExistsException.class);
+    }
+
+    @Test
+    void 회원가입_요청_이미_존재하는_유저이름_요청_에러throw() {
+        // given
+        userService.join(joinUserReqeustDto);
+        JoinUserReqeustDto anotherEmailRequest = StubUser.generateJoinRequestByEmail("another@test.com");
+
+        // when
+        Throwable catchThrow = Assertions.catchThrowable(
+                () -> userService.join(anotherEmailRequest));
+        // then
+        Assertions.assertThat(catchThrow).isInstanceOf(AlreadyUserExistsException.class);
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/FakeFactory.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/FakeFactory.java
new file mode 100644
index 000000000..b2e19b985
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/FakeFactory.java
@@ -0,0 +1,19 @@
+package com.sprint.mission.discodeit.fake;
+
+import com.sprint.mission.discodeit.application.service.UserService;
+import com.sprint.mission.discodeit.application.service.converter.UserConverter;
+import com.sprint.mission.discodeit.fake.repository.FakeUserRepository;
+import com.sprint.mission.discodeit.repository.user.interfaces.UserRepository;
+
+public class FakeFactory {
+    private FakeFactory() {
+    }
+
+    public static UserRepository getUserRepository() {
+        return new FakeUserRepository();
+    }
+
+    public static UserService getUserService() {
+        return new UserService(getUserRepository(), new UserConverter());
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/domain/user/StubUser.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/domain/user/StubUser.java
new file mode 100644
index 000000000..3926dd5c2
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/domain/user/StubUser.java
@@ -0,0 +1,43 @@
+package com.sprint.mission.discodeit.fake.domain.user;
+
+import com.sprint.mission.discodeit.application.dto.JoinUserReqeustDto;
+import com.sprint.mission.discodeit.domain.user.BirthDate;
+import com.sprint.mission.discodeit.domain.user.Email;
+import com.sprint.mission.discodeit.domain.user.Nickname;
+import com.sprint.mission.discodeit.domain.user.Password;
+import com.sprint.mission.discodeit.domain.user.User;
+import com.sprint.mission.discodeit.domain.user.Username;
+import com.sprint.mission.discodeit.domain.user.enums.EmailSubscriptionStatus;
+import java.time.LocalDate;
+
+public class StubUser {
+
+    private static final String USER_NAME = "user123";
+    private static final String NICK_NAME = "User1";
+    private static final String EMAIL = "test@example.com";
+    private static final String PASSWORD = "A1b@5678";
+    private static final LocalDate BIRTH_DATE = LocalDate.of(2000, 1, 1);
+
+    public static User generateUser() {
+        return User.builder()
+            .username(new Username(USER_NAME))
+            .nickname(new Nickname(NICK_NAME))
+            .email(new Email(EMAIL))
+            .password(new Password(PASSWORD))
+            .birthDate(new BirthDate(BIRTH_DATE))
+            .emailSubscriptionStatus(EmailSubscriptionStatus.SUBSCRIBED)
+            .build();
+    }
+
+    public static JoinUserReqeustDto generateJoinRequestDto() {
+        return new JoinUserReqeustDto(NICK_NAME, USER_NAME, EMAIL, PASSWORD, BIRTH_DATE);
+    }
+
+    public static JoinUserReqeustDto generateJoinRequestByUsername(String username) {
+        return new JoinUserReqeustDto(NICK_NAME, username, EMAIL, PASSWORD, BIRTH_DATE);
+    }
+
+    public static JoinUserReqeustDto generateJoinRequestByEmail(String email) {
+        return new JoinUserReqeustDto(NICK_NAME, USER_NAME, email, PASSWORD, BIRTH_DATE);
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/repository/FakeUserRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/repository/FakeUserRepository.java
new file mode 100644
index 000000000..f13964d13
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/repository/FakeUserRepository.java
@@ -0,0 +1,36 @@
+package com.sprint.mission.discodeit.fake.repository;
+
+import com.sprint.mission.discodeit.domain.user.Email;
+import com.sprint.mission.discodeit.domain.user.User;
+import com.sprint.mission.discodeit.domain.user.Username;
+import com.sprint.mission.discodeit.repository.user.interfaces.UserRepository;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+import java.util.UUID;
+
+public class FakeUserRepository implements UserRepository {
+
+    Map<UUID, User> store = new HashMap<>();
+    Set<Email> emails = new HashSet<>();
+    Set<Username> usernames = new HashSet<>();
+
+    @Override
+    public User save(User user) {
+        store.put(user.getId(), user);
+        emails.add(user.getEmail());
+        usernames.add(user.getUsername());
+        return user;
+    }
+
+    @Override
+    public boolean isExistByEmail(Email email) {
+        return emails.contains(email);
+    }
+
+    @Override
+    public boolean isExistByUsername(Username username) {
+        return usernames.contains(username);
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/repository/user/interfaces/UserRepositoryTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/repository/user/interfaces/UserRepositoryTest.java
new file mode 100644
index 000000000..c8018a376
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/repository/user/interfaces/UserRepositoryTest.java
@@ -0,0 +1,27 @@
+package com.sprint.mission.discodeit.repository.user.interfaces;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import com.sprint.mission.discodeit.domain.user.Email;
+import com.sprint.mission.discodeit.domain.user.User;
+import com.sprint.mission.discodeit.fake.FakeFactory;
+import com.sprint.mission.discodeit.fake.domain.user.StubUser;
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+class UserRepositoryTest {
+
+    private final UserRepository userRepository = FakeFactory.getUserRepository();
+    private final User user = StubUser.generateUser();
+
+    @Test
+    void 사용중인_이메일_검증() {
+        // given
+        userRepository.save(user);
+        String existedEmailValue = user.getEmailValue();
+        // when
+        boolean result = userRepository.isExistByEmail(new Email(existedEmailValue));
+        // then
+        Assertions.assertThat(result).isTrue();
+    }
+}

From 904b25288b01a7c914f3c27f0c67f3b36d6b1e81 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?= <9712jw@gmail.com>
Date: Sat, 8 Feb 2025 01:36:43 +0900
Subject: [PATCH 10/38] =?UTF-8?q?feat:=20=EC=9C=A0=EC=A0=80=20=EB=B9=84?=
 =?UTF-8?q?=EB=B0=80=EB=B2=88=ED=98=B8=20=EC=95=94=ED=98=B8=ED=99=94=20?=
 =?UTF-8?q?=EA=B8=B0=EB=8A=A5=20=EA=B5=AC=ED=98=84?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../1-sprint-mission/build.gradle             |  2 +
 .../application/auth/PasswordEncoder.java     | 17 +++++
 .../application/service/UserService.java      | 42 ------------
 .../application/service/user/UserService.java | 67 +++++++++++++++++++
 .../{ => user}/converter/UserConverter.java   |  2 +-
 .../discodeit/domain/user/Password.java       | 17 +++--
 .../user/validation/PasswordValidator.java    |  2 +-
 .../application/auth/PasswordEncoderTest.java | 21 ++++++
 .../application/service/UserServiceTest.java  |  1 +
 .../validation/PasswordValidatorTest.java     |  4 +-
 .../mission/discodeit/fake/FakeFactory.java   |  7 +-
 ...0 \353\252\250\353\215\270\353\247\201.md" | 10 +++
 12 files changed, 138 insertions(+), 54 deletions(-)
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/auth/PasswordEncoder.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/UserService.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/UserService.java
 rename codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/{ => user}/converter/UserConverter.java (94%)
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/application/auth/PasswordEncoderTest.java

diff --git a/codeit-bootcamp-spring/1-sprint-mission/build.gradle b/codeit-bootcamp-spring/1-sprint-mission/build.gradle
index f8c023fa7..6feb1dcd3 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/build.gradle
+++ b/codeit-bootcamp-spring/1-sprint-mission/build.gradle
@@ -33,6 +33,8 @@ dependencies {
     // https://mvnrepository.com/artifact/org.hibernate.validator/hibernate-validator
     implementation 'org.hibernate.validator:hibernate-validator:8.0.2.Final'
 
+    // https://mvnrepository.com/artifact/org.mindrot/jbcrypt
+    implementation 'org.mindrot:jbcrypt:0.4'
 
 }
 
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/auth/PasswordEncoder.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/auth/PasswordEncoder.java
new file mode 100644
index 000000000..dcbc7429e
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/auth/PasswordEncoder.java
@@ -0,0 +1,17 @@
+package com.sprint.mission.discodeit.application.auth;
+
+import org.mindrot.jbcrypt.BCrypt;
+import org.springframework.stereotype.Component;
+
+@Component
+public class PasswordEncoder {
+
+    public String encode(String rawPassword) {
+        return BCrypt.hashpw(rawPassword, BCrypt.gensalt(12));
+    }
+
+    public boolean matches(String rawPassword, String encodedPassword) {
+        return BCrypt.checkpw(rawPassword, encodedPassword);
+    }
+
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/UserService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/UserService.java
deleted file mode 100644
index d49aa1f7f..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/UserService.java
+++ /dev/null
@@ -1,42 +0,0 @@
-package com.sprint.mission.discodeit.application.service;
-
-import com.sprint.mission.discodeit.application.dto.JoinUserReqeustDto;
-import com.sprint.mission.discodeit.application.dto.UserResponseDto;
-import com.sprint.mission.discodeit.application.service.converter.UserConverter;
-import com.sprint.mission.discodeit.domain.user.Email;
-import com.sprint.mission.discodeit.domain.user.User;
-import com.sprint.mission.discodeit.domain.user.Username;
-import com.sprint.mission.discodeit.domain.user.exception.AlreadyUserExistsException;
-import com.sprint.mission.discodeit.global.error.ErrorCode;
-import com.sprint.mission.discodeit.repository.user.interfaces.UserRepository;
-import org.springframework.stereotype.Service;
-
-@Service
-public class UserService {
-
-    private final UserRepository userRepository;
-    private final UserConverter userConverter;
-
-    public UserService(
-        UserRepository userRepository,
-        UserConverter userConverter
-    ) {
-        this.userRepository = userRepository;
-        this.userConverter = userConverter;
-    }
-
-    public UserResponseDto join(JoinUserReqeustDto requestDto) {
-        boolean isEmailAlreadyUsed = userRepository.isExistByEmail(new Email(requestDto.email()));
-        if (isEmailAlreadyUsed) {
-            throw new AlreadyUserExistsException(ErrorCode.DUPLICATE_EMAIL, requestDto.email());
-        }
-
-        boolean isUsernameAlreadyUsed = userRepository.isExistByUsername(new Username(requestDto.username()));
-        if (isUsernameAlreadyUsed) {
-            throw new AlreadyUserExistsException(ErrorCode.DUPLICATE_USERNAME, requestDto.username());
-        }
-
-        User savedUser = userRepository.save(userConverter.toUser(requestDto));
-        return userConverter.toDto(savedUser);
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/UserService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/UserService.java
new file mode 100644
index 000000000..e0a6ebf52
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/UserService.java
@@ -0,0 +1,67 @@
+package com.sprint.mission.discodeit.application.service.user;
+
+import com.sprint.mission.discodeit.application.auth.PasswordEncoder;
+import com.sprint.mission.discodeit.application.dto.JoinUserReqeustDto;
+import com.sprint.mission.discodeit.application.dto.UserResponseDto;
+import com.sprint.mission.discodeit.application.service.user.converter.UserConverter;
+import com.sprint.mission.discodeit.domain.user.BirthDate;
+import com.sprint.mission.discodeit.domain.user.Email;
+import com.sprint.mission.discodeit.domain.user.Nickname;
+import com.sprint.mission.discodeit.domain.user.Password;
+import com.sprint.mission.discodeit.domain.user.User;
+import com.sprint.mission.discodeit.domain.user.Username;
+import com.sprint.mission.discodeit.domain.user.enums.EmailSubscriptionStatus;
+import com.sprint.mission.discodeit.domain.user.exception.AlreadyUserExistsException;
+import com.sprint.mission.discodeit.domain.user.validation.PasswordValidator;
+import com.sprint.mission.discodeit.global.error.ErrorCode;
+import com.sprint.mission.discodeit.repository.user.interfaces.UserRepository;
+import org.springframework.stereotype.Service;
+
+@Service
+public class UserService {
+
+    private final UserRepository userRepository;
+    private final UserConverter userConverter;
+    private final PasswordEncoder passwordEncoder;
+
+    public UserService(
+        UserRepository userRepository,
+        UserConverter userConverter,
+        PasswordEncoder passwordEncoder
+    ) {
+        this.userRepository = userRepository;
+        this.userConverter = userConverter;
+        this.passwordEncoder = passwordEncoder;
+    }
+
+    public UserResponseDto join(JoinUserReqeustDto requestDto) {
+        checkEmailAlreadyUsedOrThrow(requestDto.email());
+        checkUsernameAlreadyUsedOrThrow(requestDto.username());
+        PasswordValidator.validateOrThrow(requestDto.password());
+        User savedUser = userRepository.save(toUserWithPasswordEncode(requestDto));
+        return userConverter.toDto(savedUser);
+    }
+
+    private void checkEmailAlreadyUsedOrThrow(String email) {
+        if (userRepository.isExistByEmail(new Email(email))) {
+            throw new AlreadyUserExistsException(ErrorCode.DUPLICATE_EMAIL, email);
+        }
+    }
+
+    private void checkUsernameAlreadyUsedOrThrow(String username) {
+        if (userRepository.isExistByUsername(new Username(username))) {
+            throw new AlreadyUserExistsException(ErrorCode.DUPLICATE_USERNAME, username);
+        }
+    }
+
+    private User toUserWithPasswordEncode(JoinUserReqeustDto requestDto) {
+        return User.builder()
+                .username(new Username(requestDto.username()))
+                .nickname(new Nickname(requestDto.nickname()))
+                .email(new Email(requestDto.email()))
+                .password(new Password(passwordEncoder.encode(requestDto.password())))
+                .birthDate(new BirthDate(requestDto.birthDate()))
+                .emailSubscriptionStatus(EmailSubscriptionStatus.UNSUBSCRIBED)
+                .build();
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/converter/UserConverter.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/converter/UserConverter.java
similarity index 94%
rename from codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/converter/UserConverter.java
rename to codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/converter/UserConverter.java
index 06d4671b2..cd6514c8c 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/converter/UserConverter.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/converter/UserConverter.java
@@ -1,4 +1,4 @@
-package com.sprint.mission.discodeit.application.service.converter;
+package com.sprint.mission.discodeit.application.service.user.converter;
 
 import com.sprint.mission.discodeit.application.dto.JoinUserReqeustDto;
 import com.sprint.mission.discodeit.application.dto.UserResponseDto;
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Password.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Password.java
index 9ece7c363..e9362775d 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Password.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Password.java
@@ -1,18 +1,25 @@
 package com.sprint.mission.discodeit.domain.user;
 
-import com.sprint.mission.discodeit.domain.user.validation.PasswordValidator;
-import lombok.Getter;
 import lombok.ToString;
 
-@Getter
 @ToString(of = "value")
 public class Password {
 
-    private final String value;
+    private String value;
 
     public Password(String value) {
-        PasswordValidator.validate(value);
         this.value = value;
     }
 
+    public void changePassword(String encodedPassword) {
+        setValue(encodedPassword);
+    }
+
+    private void setValue(String value) {
+        this.value = value;
+    }
+
+    public String getValue() {
+        return value;
+    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/PasswordValidator.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/PasswordValidator.java
index 64af5213f..9a2bcfe2a 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/PasswordValidator.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/PasswordValidator.java
@@ -11,7 +11,7 @@ public class PasswordValidator {
     private final static String PASSWORD_REX = "^(?=.*[A-Z])(?=.*[0-9])(?=.*[a-z])(?=.*[!@#$%^&*()_+])\\S{8,}$";
     private final static Pattern PASSWORD_PATTERN = Pattern.compile(PASSWORD_REX);
 
-    public static void validate(String password) {
+    public static void validateOrThrow(String password) {
         if (Objects.isNull(password) || password.isEmpty()) {
             throw new PassWordInvalidException(ErrorCode.PASSWORD_REQUIRED, "");
         }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/application/auth/PasswordEncoderTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/application/auth/PasswordEncoderTest.java
new file mode 100644
index 000000000..143ac2048
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/application/auth/PasswordEncoderTest.java
@@ -0,0 +1,21 @@
+package com.sprint.mission.discodeit.application.auth;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.junit.jupiter.api.Test;
+
+class PasswordEncoderTest {
+
+    @Test
+    void 암호화_한_비밀번호_검증() {
+        // given
+        String password = "testPassword";
+        PasswordEncoder encoder = new PasswordEncoder();
+        // when
+        String encodedPassword = encoder.encode(password);
+        // then
+        assertTrue(encoder.matches(password, encodedPassword));
+        assertFalse(encoder.matches("anotherPassword",encodedPassword));
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/application/service/UserServiceTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/application/service/UserServiceTest.java
index 532a72f20..9ad8465df 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/application/service/UserServiceTest.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/application/service/UserServiceTest.java
@@ -1,6 +1,7 @@
 package com.sprint.mission.discodeit.application.service;
 
 import com.sprint.mission.discodeit.application.dto.JoinUserReqeustDto;
+import com.sprint.mission.discodeit.application.service.user.UserService;
 import com.sprint.mission.discodeit.domain.user.exception.AlreadyUserExistsException;
 import com.sprint.mission.discodeit.fake.FakeFactory;
 import com.sprint.mission.discodeit.fake.domain.user.StubUser;
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/PasswordValidatorTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/PasswordValidatorTest.java
index b7cbcdd37..ce87bb88b 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/PasswordValidatorTest.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/PasswordValidatorTest.java
@@ -31,7 +31,7 @@ class PasswordValidatorTest {
     void 비밀번호_정규식_생성_검증_에러throw(String password) {
         //given
         // when
-        Throwable catchThrow = catchThrowable(() -> PasswordValidator.validate(password));
+        Throwable catchThrow = catchThrowable(() -> PasswordValidator.validateOrThrow(password));
         // then
         assertThat(catchThrow).isInstanceOf(PassWordInvalidException.class);
     }
@@ -40,4 +40,4 @@ static Stream<String> passwordOverLengthProvider() {
         return Stream.of("A1!a".repeat(26));
     }
 
-}
\ No newline at end of file
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/FakeFactory.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/FakeFactory.java
index b2e19b985..0a3f22b6f 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/FakeFactory.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/FakeFactory.java
@@ -1,7 +1,8 @@
 package com.sprint.mission.discodeit.fake;
 
-import com.sprint.mission.discodeit.application.service.UserService;
-import com.sprint.mission.discodeit.application.service.converter.UserConverter;
+import com.sprint.mission.discodeit.application.auth.PasswordEncoder;
+import com.sprint.mission.discodeit.application.service.user.UserService;
+import com.sprint.mission.discodeit.application.service.user.converter.UserConverter;
 import com.sprint.mission.discodeit.fake.repository.FakeUserRepository;
 import com.sprint.mission.discodeit.repository.user.interfaces.UserRepository;
 
@@ -14,6 +15,6 @@ public static UserRepository getUserRepository() {
     }
 
     public static UserService getUserService() {
-        return new UserService(getUserRepository(), new UserConverter());
+        return new UserService(getUserRepository(), new UserConverter(), new PasswordEncoder());
     }
 }
diff --git "a/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md" "b/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md"
index 79f42a541..63a5a431d 100644
--- "a/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md"	
+++ "b/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md"	
@@ -23,3 +23,13 @@
     - 비밀번호: 필수, 개수 제한 8미만 x , 영문 대문자, 소문자, 숫자, 특수문자가 들어가야합니다. 공백 x
     - 생년월일: 필수, 13세 이상만 사용가능
   - 사용하고 있는 이메일인지 검증한다.
+  - 사용하고 있는 유저이름인지 검증한다.
+  - 비밀번호를 저장할 때 암호화를 진행한다.
+    - [jBCrypt](https://www.mindrot.org/projects/jBCrypt/)
+
+- 로그인
+  - `이메일`과 `비밀번호`를 입력받는다.
+    - 유저의 비밀번호가 틀리다면 에러를 반환한다.
+
+
+-- newLine for git

From 8994b9c35ec9f104acb6bd07c0dd834085fc6560 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?= <9712jw@gmail.com>
Date: Sat, 8 Feb 2025 01:56:06 +0900
Subject: [PATCH 11/38] =?UTF-8?q?refactor:=20In=20memory=20user=20reposito?=
 =?UTF-8?q?ry=20=ED=95=84=EB=93=9C=20=EC=9E=90=EB=A3=8C=EA=B5=AC=EC=A1=B0?=
 =?UTF-8?q?=20=EB=B3=80=EA=B2=BD?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../user/InMemoryUserRepository.java           | 17 ++++++++---------
 .../fake/repository/FakeUserRepository.java    | 18 ++++++++----------
 2 files changed, 16 insertions(+), 19 deletions(-)

diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/InMemoryUserRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/InMemoryUserRepository.java
index 3fa60e569..34151bac1 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/InMemoryUserRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/InMemoryUserRepository.java
@@ -5,33 +5,32 @@
 import com.sprint.mission.discodeit.domain.user.Username;
 import com.sprint.mission.discodeit.repository.user.interfaces.UserRepository;
 import java.util.HashMap;
-import java.util.HashSet;
 import java.util.Map;
-import java.util.Set;
 import java.util.UUID;
 import org.springframework.stereotype.Repository;
 
 @Repository
 public class InMemoryUserRepository implements UserRepository {
 
-    Map<UUID, User> store = new HashMap<>();
-    Set<Email> emails = new HashSet<>();
-    Set<Username> usernames = new HashSet<>();
+    Map<UUID, User> uuidUsers = new HashMap<>();
+    Map<Email, User> emailUsers = new HashMap<>();
+    Map<Username, User> usernameUsers = new HashMap<>();
 
     @Override
     public User save(User user) {
-        store.put(user.getId(), user);
-        emails.add(user.getEmail());
+        uuidUsers.put(user.getId(), user);
+        emailUsers.put(user.getEmail(), user);
+        usernameUsers.put(user.getUsername(), user);
         return user;
     }
 
     @Override
     public boolean isExistByEmail(Email email) {
-        return emails.contains(email);
+        return emailUsers.containsKey(email);
     }
 
     @Override
     public boolean isExistByUsername(Username username) {
-        return usernames.contains(username);
+        return usernameUsers.containsKey(username);
     }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/repository/FakeUserRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/repository/FakeUserRepository.java
index f13964d13..86cfe9bc5 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/repository/FakeUserRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/repository/FakeUserRepository.java
@@ -5,32 +5,30 @@
 import com.sprint.mission.discodeit.domain.user.Username;
 import com.sprint.mission.discodeit.repository.user.interfaces.UserRepository;
 import java.util.HashMap;
-import java.util.HashSet;
 import java.util.Map;
-import java.util.Set;
 import java.util.UUID;
 
 public class FakeUserRepository implements UserRepository {
 
-    Map<UUID, User> store = new HashMap<>();
-    Set<Email> emails = new HashSet<>();
-    Set<Username> usernames = new HashSet<>();
+    Map<UUID, User> uuidUsers = new HashMap<>();
+    Map<Email, User> emailUsers = new HashMap<>();
+    Map<Username, User> usernameUsers = new HashMap<>();
 
     @Override
     public User save(User user) {
-        store.put(user.getId(), user);
-        emails.add(user.getEmail());
-        usernames.add(user.getUsername());
+        uuidUsers.put(user.getId(), user);
+        emailUsers.put(user.getEmail(), user);
+        usernameUsers.put(user.getUsername(), user);
         return user;
     }
 
     @Override
     public boolean isExistByEmail(Email email) {
-        return emails.contains(email);
+        return emailUsers.containsKey(email);
     }
 
     @Override
     public boolean isExistByUsername(Username username) {
-        return usernames.contains(username);
+        return usernameUsers.containsKey(username);
     }
 }

From 1abd1ab5658c45067ae366d562f9b82f6a650a8e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?= <9712jw@gmail.com>
Date: Sat, 8 Feb 2025 04:02:56 +0900
Subject: [PATCH 12/38] =?UTF-8?q?feat:=20=EB=A1=9C=EA=B7=B8=EC=9D=B8=20?=
 =?UTF-8?q?=EA=B8=B0=EB=8A=A5=20=EA=B5=AC=ED=98=84?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../application/dto/LoginRequestDto.java      |  9 +++++++
 .../application/service/user/UserService.java | 27 ++++++++++++++++---
 .../mission/discodeit/domain/user/User.java   | 16 ++++++-----
 .../user/exception/InvalidLoginException.java | 10 +++++++
 .../user/exception/UserNotFoundException.java | 10 +++++++
 .../discodeit/global/error/ErrorCode.java     |  4 ++-
 .../user/InMemoryUserRepository.java          |  7 +++++
 .../user/interfaces/UserRepository.java       |  6 +++++
 .../fake/repository/FakeUserRepository.java   |  7 +++++
 ...0 \353\252\250\353\215\270\353\247\201.md" |  2 ++
 10 files changed, 88 insertions(+), 10 deletions(-)
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/LoginRequestDto.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/exception/InvalidLoginException.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/exception/UserNotFoundException.java

diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/LoginRequestDto.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/LoginRequestDto.java
new file mode 100644
index 000000000..64591d96d
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/LoginRequestDto.java
@@ -0,0 +1,9 @@
+package com.sprint.mission.discodeit.application.dto;
+
+import jakarta.validation.constraints.NotBlank;
+
+public record LoginRequestDto(
+        @NotBlank String email,
+        @NotBlank String password
+) {
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/UserService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/UserService.java
index e0a6ebf52..ee3fc0bf3 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/UserService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/UserService.java
@@ -2,6 +2,7 @@
 
 import com.sprint.mission.discodeit.application.auth.PasswordEncoder;
 import com.sprint.mission.discodeit.application.dto.JoinUserReqeustDto;
+import com.sprint.mission.discodeit.application.dto.LoginRequestDto;
 import com.sprint.mission.discodeit.application.dto.UserResponseDto;
 import com.sprint.mission.discodeit.application.service.user.converter.UserConverter;
 import com.sprint.mission.discodeit.domain.user.BirthDate;
@@ -12,9 +13,12 @@
 import com.sprint.mission.discodeit.domain.user.Username;
 import com.sprint.mission.discodeit.domain.user.enums.EmailSubscriptionStatus;
 import com.sprint.mission.discodeit.domain.user.exception.AlreadyUserExistsException;
+import com.sprint.mission.discodeit.domain.user.exception.InvalidLoginException;
+import com.sprint.mission.discodeit.domain.user.exception.UserNotFoundException;
 import com.sprint.mission.discodeit.domain.user.validation.PasswordValidator;
 import com.sprint.mission.discodeit.global.error.ErrorCode;
 import com.sprint.mission.discodeit.repository.user.interfaces.UserRepository;
+import java.util.UUID;
 import org.springframework.stereotype.Service;
 
 @Service
@@ -25,9 +29,9 @@ public class UserService {
     private final PasswordEncoder passwordEncoder;
 
     public UserService(
-        UserRepository userRepository,
-        UserConverter userConverter,
-        PasswordEncoder passwordEncoder
+            UserRepository userRepository,
+            UserConverter userConverter,
+            PasswordEncoder passwordEncoder
     ) {
         this.userRepository = userRepository;
         this.userConverter = userConverter;
@@ -42,6 +46,19 @@ public UserResponseDto join(JoinUserReqeustDto requestDto) {
         return userConverter.toDto(savedUser);
     }
 
+    public void login(LoginRequestDto requestDto) {
+        userRepository.findOneByEmail(new Email(requestDto.email()))
+                .filter(user -> matchUserPassword(requestDto.password(), user.getPasswordValue()))
+                .orElseThrow(() -> new InvalidLoginException(ErrorCode.INVALID_CREDENTIALS));
+        // 3. 로그인 성공 시 로직 구현하기 - 쿠키(어떤 값 담지?), 세부적인건 우선순위를 뒤로 미루기
+        // etc. 스프링 시큐리티 적용 시 리팩터링 최대한 변경에 유연하게 코딩
+    }
+
+    public User findOneByIdOrThrow(UUID uuid) {
+        return userRepository.findOneById(uuid)
+                .orElseThrow(() -> new UserNotFoundException(ErrorCode.NOT_FOUND));
+    }
+
     private void checkEmailAlreadyUsedOrThrow(String email) {
         if (userRepository.isExistByEmail(new Email(email))) {
             throw new AlreadyUserExistsException(ErrorCode.DUPLICATE_EMAIL, email);
@@ -54,6 +71,10 @@ private void checkUsernameAlreadyUsedOrThrow(String username) {
         }
     }
 
+    private boolean matchUserPassword(String rawPassword, String encodedPassword) {
+        return passwordEncoder.matches(rawPassword, encodedPassword);
+    }
+
     private User toUserWithPasswordEncode(JoinUserReqeustDto requestDto) {
         return User.builder()
                 .username(new Username(requestDto.username()))
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/User.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/User.java
index be604a7be..edf96a5bd 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/User.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/User.java
@@ -20,12 +20,12 @@ public class User {
 
     @Builder
     public User(
-        Nickname nickname,
-        Username username,
-        Email email,
-        Password password,
-        BirthDate birthDate,
-        EmailSubscriptionStatus emailSubscriptionStatus
+            Nickname nickname,
+            Username username,
+            Email email,
+            Password password,
+            BirthDate birthDate,
+            EmailSubscriptionStatus emailSubscriptionStatus
     ) {
         this.id = UUID.randomUUID();
         this.createdAt = LocalDateTime.now();
@@ -62,6 +62,10 @@ public String getEmailValue() {
         return this.email.getValue();
     }
 
+    public String getPasswordValue() {
+        return this.password.getValue();
+    }
+
     @Override
     public boolean equals(Object o) {
         if (this == o) {
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/exception/InvalidLoginException.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/exception/InvalidLoginException.java
new file mode 100644
index 000000000..52aad5360
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/exception/InvalidLoginException.java
@@ -0,0 +1,10 @@
+package com.sprint.mission.discodeit.domain.user.exception;
+
+import com.sprint.mission.discodeit.global.error.ErrorCode;
+import com.sprint.mission.discodeit.global.error.exception.EntityNotFoundException;
+
+public class InvalidLoginException extends EntityNotFoundException {
+    public InvalidLoginException(ErrorCode errorCode) {
+        super(errorCode);
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/exception/UserNotFoundException.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/exception/UserNotFoundException.java
new file mode 100644
index 000000000..0f61d8dd5
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/exception/UserNotFoundException.java
@@ -0,0 +1,10 @@
+package com.sprint.mission.discodeit.domain.user.exception;
+
+import com.sprint.mission.discodeit.global.error.ErrorCode;
+import com.sprint.mission.discodeit.global.error.exception.EntityNotFoundException;
+
+public class UserNotFoundException extends EntityNotFoundException {
+    public UserNotFoundException(ErrorCode errorCode) {
+        super(errorCode);
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorCode.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorCode.java
index e703ecb7b..4bf0d3a3e 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorCode.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorCode.java
@@ -2,6 +2,8 @@
 
 public enum ErrorCode {
 
+    // common
+    NOT_FOUND(404, "요청한 데이터를 찾을 수 없습니다.", "C004"),
 
     // User Domain
     INVALID_USERNAME_LENGTH(400, "유저 이름은 1~32자 이내여야 합니다.", "U001"),
@@ -23,7 +25,7 @@ public enum ErrorCode {
     DUPLICATE_EMAIL(400, "이미 사용중인 이메일입니다.", "U307"),
     DUPLICATE_USERNAME(400, "이미 존재하는 유저이름입니다.", "U308"),
 
-
+    INVALID_CREDENTIALS(400, "아이디 또는 비밀번호가 일치하지 않습니다.", "U501")
     ;
 
     private final int status;
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/InMemoryUserRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/InMemoryUserRepository.java
index 34151bac1..d0a18beab 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/InMemoryUserRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/InMemoryUserRepository.java
@@ -6,6 +6,7 @@
 import com.sprint.mission.discodeit.repository.user.interfaces.UserRepository;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.Optional;
 import java.util.UUID;
 import org.springframework.stereotype.Repository;
 
@@ -24,6 +25,12 @@ public User save(User user) {
         return user;
     }
 
+    @Override
+    public Optional<User> findOneByEmail(Email email) {
+        User foundUser = emailUsers.get(email);
+        return Optional.ofNullable(foundUser);
+    }
+
     @Override
     public boolean isExistByEmail(Email email) {
         return emailUsers.containsKey(email);
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/interfaces/UserRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/interfaces/UserRepository.java
index a345c2425..3b32b09d1 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/interfaces/UserRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/interfaces/UserRepository.java
@@ -3,11 +3,17 @@
 import com.sprint.mission.discodeit.domain.user.Email;
 import com.sprint.mission.discodeit.domain.user.User;
 import com.sprint.mission.discodeit.domain.user.Username;
+import java.util.Optional;
+import java.util.UUID;
 
 public interface UserRepository {
 
     User save(User user);
 
+    Optional<User> findOneById(UUID id);
+
+    Optional<User> findOneByEmail(Email email);
+
     boolean isExistByEmail(Email email);
 
     boolean isExistByUsername(Username username);
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/repository/FakeUserRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/repository/FakeUserRepository.java
index 86cfe9bc5..ca925fa81 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/repository/FakeUserRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/repository/FakeUserRepository.java
@@ -6,6 +6,7 @@
 import com.sprint.mission.discodeit.repository.user.interfaces.UserRepository;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.Optional;
 import java.util.UUID;
 
 public class FakeUserRepository implements UserRepository {
@@ -22,6 +23,12 @@ public User save(User user) {
         return user;
     }
 
+    @Override
+    public Optional<User> findOneByEmail(Email email) {
+        User foundUser = emailUsers.get(email);
+        return Optional.ofNullable(foundUser);
+    }
+
     @Override
     public boolean isExistByEmail(Email email) {
         return emailUsers.containsKey(email);
diff --git "a/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md" "b/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md"
index 63a5a431d..ad605e1a0 100644
--- "a/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md"	
+++ "b/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md"	
@@ -31,5 +31,7 @@
   - `이메일`과 `비밀번호`를 입력받는다.
     - 유저의 비밀번호가 틀리다면 에러를 반환한다.
 
+- 
+
 
 -- newLine for git

From 195cf7880522374b4925ccae8889e307c49b3d93 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?= <9712jw@gmail.com>
Date: Sat, 8 Feb 2025 04:05:41 +0900
Subject: [PATCH 13/38] =?UTF-8?q?fix:=20test=20build=20fail=20=EB=AC=B8?=
 =?UTF-8?q?=EC=A0=9C=20=ED=95=B4=EA=B2=B0?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

인터페이스 메소드 구현체 구현추가
---
 .../discodeit/repository/user/InMemoryUserRepository.java | 8 ++++++--
 .../discodeit/fake/repository/FakeUserRepository.java     | 8 ++++++--
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/InMemoryUserRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/InMemoryUserRepository.java
index d0a18beab..07d426bef 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/InMemoryUserRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/InMemoryUserRepository.java
@@ -25,10 +25,14 @@ public User save(User user) {
         return user;
     }
 
+    @Override
+    public Optional<User> findOneById(UUID id) {
+        return Optional.ofNullable(uuidUsers.get(id));
+    }
+
     @Override
     public Optional<User> findOneByEmail(Email email) {
-        User foundUser = emailUsers.get(email);
-        return Optional.ofNullable(foundUser);
+        return Optional.ofNullable(emailUsers.get(email));
     }
 
     @Override
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/repository/FakeUserRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/repository/FakeUserRepository.java
index ca925fa81..c0e18306f 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/repository/FakeUserRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/repository/FakeUserRepository.java
@@ -23,10 +23,14 @@ public User save(User user) {
         return user;
     }
 
+    @Override
+    public Optional<User> findOneById(UUID id) {
+        return Optional.ofNullable(uuidUsers.get(id));
+    }
+
     @Override
     public Optional<User> findOneByEmail(Email email) {
-        User foundUser = emailUsers.get(email);
-        return Optional.ofNullable(foundUser);
+        return Optional.ofNullable(emailUsers.get(email));
     }
 
     @Override

From 297bbd7b337da989da8d9758c05d00ef5675fe26 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?= <9712jw@gmail.com>
Date: Sat, 8 Feb 2025 22:39:30 +0900
Subject: [PATCH 14/38] =?UTF-8?q?refactor:=20method=20name=20=EB=B3=80?=
 =?UTF-8?q?=EA=B2=BD?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

checkAlready -> throwAlready
---
 .../application/service/user/UserService.java     |  8 ++++----
 ...5\270 \353\252\250\353\215\270\353\247\201.md" | 15 ++++++++++++++-
 2 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/UserService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/UserService.java
index ee3fc0bf3..524fdc913 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/UserService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/UserService.java
@@ -39,8 +39,8 @@ public UserService(
     }
 
     public UserResponseDto join(JoinUserReqeustDto requestDto) {
-        checkEmailAlreadyUsedOrThrow(requestDto.email());
-        checkUsernameAlreadyUsedOrThrow(requestDto.username());
+        throwEmailAlreadyUsed(requestDto.email());
+        throwUsernameAlreadyUsed(requestDto.username());
         PasswordValidator.validateOrThrow(requestDto.password());
         User savedUser = userRepository.save(toUserWithPasswordEncode(requestDto));
         return userConverter.toDto(savedUser);
@@ -59,13 +59,13 @@ public User findOneByIdOrThrow(UUID uuid) {
                 .orElseThrow(() -> new UserNotFoundException(ErrorCode.NOT_FOUND));
     }
 
-    private void checkEmailAlreadyUsedOrThrow(String email) {
+    private void throwEmailAlreadyUsed(String email) {
         if (userRepository.isExistByEmail(new Email(email))) {
             throw new AlreadyUserExistsException(ErrorCode.DUPLICATE_EMAIL, email);
         }
     }
 
-    private void checkUsernameAlreadyUsedOrThrow(String username) {
+    private void throwUsernameAlreadyUsed(String username) {
         if (userRepository.isExistByUsername(new Username(username))) {
             throw new AlreadyUserExistsException(ErrorCode.DUPLICATE_USERNAME, username);
         }
diff --git "a/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md" "b/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md"
index ad605e1a0..74d2b3c05 100644
--- "a/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md"	
+++ "b/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md"	
@@ -31,7 +31,20 @@
   - `이메일`과 `비밀번호`를 입력받는다.
     - 유저의 비밀번호가 틀리다면 에러를 반환한다.
 
-- 
+- 비밀번호 변경
+- 수신 여부 변경
 
+## 채널
+- 새로운 채널 생성
+  - 
+- 채널 삭제
+- 채널 정보 수정
+
+
+## 메세지
+- 새로운 메시지 생성
+  - 
+- 메시지 내용 수정
+- 메시지 삭제
 
 -- newLine for git

From 0db550cd6ac6c1fb50aaffddd6aad7a44b990b68 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?= <9712jw@gmail.com>
Date: Sat, 8 Feb 2025 22:51:22 +0900
Subject: [PATCH 15/38] =?UTF-8?q?refactor:=20validate=20=EA=B8=B0=EB=8A=A5?=
 =?UTF-8?q?=EC=9D=84=20=EB=8F=84=EB=A9=94=EC=9D=B8=20=EB=AA=A8=EB=8D=B8=20?=
 =?UTF-8?q?=EC=95=88=EC=9C=BC=EB=A1=9C=20=EB=A6=AC=ED=8C=A9=ED=84=B0?=
 =?UTF-8?q?=EB=A7=81?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../discodeit/domain/user/BirthDate.java      | 16 +++++-
 .../mission/discodeit/domain/user/Email.java  | 19 ++++++-
 .../discodeit/domain/user/Nickname.java       | 50 ++++++++++++++++++-
 .../discodeit/domain/user/Username.java       | 37 +++++++++++++-
 .../user/validation/PasswordValidator.java    |  2 -
 5 files changed, 116 insertions(+), 8 deletions(-)

diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/BirthDate.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/BirthDate.java
index 411cec7b1..56283fb02 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/BirthDate.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/BirthDate.java
@@ -1,16 +1,20 @@
 package com.sprint.mission.discodeit.domain.user;
 
+import com.sprint.mission.discodeit.domain.user.exception.BirthDateInvalidException;
 import com.sprint.mission.discodeit.domain.user.validation.BirthDateValidator;
+import com.sprint.mission.discodeit.global.error.ErrorCode;
 import java.time.LocalDate;
+import java.util.Objects;
 import lombok.Getter;
 
 @Getter
 public class BirthDate {
+    private static final int MIN_AGE_RESTRICT = 13;
 
     private final LocalDate value;
 
     public BirthDate(LocalDate value) {
-        BirthDateValidator.validate(value);
+        validate(value);
         this.value = value;
     }
 
@@ -18,4 +22,14 @@ public static BirthDate of(int year, int month, int day) {
         return new BirthDate(LocalDate.of(year, month, day));
     }
 
+    public void validate(LocalDate birthDate) {
+        if (Objects.isNull(birthDate)) {
+            throw new BirthDateInvalidException(ErrorCode.BIRTHDATE_REQUIRED, "");
+        }
+        LocalDate minimumAllowedYear = LocalDate.now().minusYears(MIN_AGE_RESTRICT);
+        if (!birthDate.isBefore(minimumAllowedYear)) {
+            throw new BirthDateInvalidException(ErrorCode.UNDERAGE_SIGNUP_REGISTERED, birthDate.toString());
+        }
+    }
+
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Email.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Email.java
index f8d1cdbe3..9a6e65384 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Email.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Email.java
@@ -1,6 +1,9 @@
 package com.sprint.mission.discodeit.domain.user;
 
-import com.sprint.mission.discodeit.domain.user.validation.EmailValidator;
+import com.sprint.mission.discodeit.domain.user.exception.EmailInvalidException;
+import com.sprint.mission.discodeit.global.error.ErrorCode;
+import java.util.Objects;
+import java.util.regex.Pattern;
 import lombok.EqualsAndHashCode;
 import lombok.Getter;
 import lombok.ToString;
@@ -10,10 +13,22 @@
 @ToString(of = {"value"})
 public class Email {
 
+    private final static String EMAIL_REGEX = "^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9-]+(?:\\.[a-zA-Z]{2,7})+$";
+    private final static Pattern EMAIL_PATTERN = Pattern.compile(EMAIL_REGEX);
+
     private final String value;
 
     public Email(String email) {
-        EmailValidator.valid(email);
+        valid(email);
         this.value = email;
     }
+
+    public void valid(String email) {
+        if (Objects.isNull(email) || email.isBlank()) {
+            throw new EmailInvalidException(ErrorCode.EMAIL_REQUIRED, "");
+        }
+        if (!EMAIL_PATTERN.matcher(email).matches()) {
+            throw new EmailInvalidException(ErrorCode.INVALID_EMAIL_FORMAT, email);
+        }
+    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Nickname.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Nickname.java
index 9b488f3dd..a03a5cf6a 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Nickname.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Nickname.java
@@ -1,6 +1,10 @@
 package com.sprint.mission.discodeit.domain.user;
 
-import com.sprint.mission.discodeit.domain.user.validation.NicknameValidator;
+import com.sprint.mission.discodeit.domain.user.exception.NickNameInvalidException;
+import com.sprint.mission.discodeit.global.error.ErrorCode;
+import java.util.Objects;
+import java.util.Set;
+import java.util.regex.Pattern;
 import lombok.EqualsAndHashCode;
 import lombok.Getter;
 import lombok.ToString;
@@ -10,11 +14,53 @@
 @ToString(of = {"value"})
 public class Nickname {
 
+    private static final int MAX_LENGTH = 32;
+    private static final Set<String> FORBIDDEN_WORDS = Set.of(
+            "admin", "moderator", "discord", "system", "root", "bot", "mod",
+            "운영자", "관리자", "봇"
+    );
+    private static final String VALID_NICK_NAME_REGEX =
+            "^(?!.*\\s)[\\p{L}\\p{N}\\p{P}\\p{S}\\p{So}]{1,32}$";
+    private static final Pattern VALID_NICK_NAME_PATTERN = Pattern.compile(VALID_NICK_NAME_REGEX);
+
     private final String value;
 
     public Nickname(String value) {
-        NicknameValidator.validate(value);
+        validate(value);
         this.value = value;
     }
 
+    public void validate(String value) {
+        throwIsNull(value);
+        throwOverLength(value);
+        throwInvalidPattern(value);
+        throwContainForbiddenWord(value);
+    }
+
+    private void throwIsNull(String value) {
+        if (Objects.isNull(value) || value.isBlank()) {
+            throw new NickNameInvalidException(ErrorCode.NICKNAME_REQUIRED, "");
+        }
+    }
+
+    private void throwOverLength(String value) {
+        if (value.length() > MAX_LENGTH) {
+            throw new NickNameInvalidException(ErrorCode.INVALID_NICKNAME_LENGTH, value);
+        }
+    }
+
+    private void throwInvalidPattern(String value) {
+        if (!VALID_NICK_NAME_PATTERN.matcher(value).matches()) {
+            throw new NickNameInvalidException(ErrorCode.INVALID_NICKNAME_FORMAT, value);
+        }
+    }
+
+    private void throwContainForbiddenWord(String value) {
+        String lowerCase = value.toLowerCase();
+        for (String word : FORBIDDEN_WORDS) {
+            if (lowerCase.contains(word)) {
+                throw new NickNameInvalidException(ErrorCode.INVALID_NICKNAME_FORMAT, value);
+            }
+        }
+    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Username.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Username.java
index 5ca240fc7..d6dab6860 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Username.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Username.java
@@ -1,6 +1,11 @@
 package com.sprint.mission.discodeit.domain.user;
 
+import com.sprint.mission.discodeit.domain.user.exception.UserNameInvalidException;
 import com.sprint.mission.discodeit.domain.user.validation.UsernameValidator;
+import com.sprint.mission.discodeit.global.error.ErrorCode;
+import java.util.Objects;
+import java.util.Set;
+import java.util.regex.Pattern;
 import lombok.EqualsAndHashCode;
 import lombok.Getter;
 import lombok.ToString;
@@ -10,11 +15,41 @@
 @ToString(of = "value")
 public class Username {
 
+    private static final int MIN_LENGTH = 2;
+    private static final int MAX_LENGTH = 32;
+    private static final String VALID_USER_NAME_REGEX = "^(?!.*\\.\\.)(?![.])(?!.*[.]$)[a-zA-Z0-9_.]{2,32}$";
+    private static final Pattern VALID_USER_NAME_PATTERN = Pattern.compile(VALID_USER_NAME_REGEX);
+    private static final Set<String> FORBIDDEN_WORD =
+            Set.of(
+                    "admin", "moderator", "discord", "system", "root", "bot", "mod",
+                    "운영자", "관리자", "봇"
+            );
+
     private final String value;
 
     public Username(String value) {
-        UsernameValidator.validate(value);
+        validate(value);
         this.value = value.toLowerCase();
     }
 
+    public void validate(final String username) {
+        if (Objects.isNull(username) || username.isBlank()) {
+            throw new UserNameInvalidException(ErrorCode.USERNAME_REQUIRED, "");
+        }
+
+        if (username.length() > MAX_LENGTH || username.length() < MIN_LENGTH) {
+            throw new UserNameInvalidException(ErrorCode.INVALID_USERNAME_LENGTH, username);
+        }
+
+        if (!VALID_USER_NAME_PATTERN.matcher(username).matches()) {
+            throw new UserNameInvalidException(ErrorCode.INVALID_USERNAME_FORMAT, username);
+        }
+
+        String lowerUsername = username.toLowerCase();
+        for (String word : FORBIDDEN_WORD) {
+            if (lowerUsername.contains(word)) {
+                throw new UserNameInvalidException(ErrorCode.INVALID_USERNAME_FORMAT, username);
+            }
+        }
+    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/PasswordValidator.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/PasswordValidator.java
index 9a2bcfe2a..9b45f3949 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/PasswordValidator.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/PasswordValidator.java
@@ -15,11 +15,9 @@ public static void validateOrThrow(String password) {
         if (Objects.isNull(password) || password.isEmpty()) {
             throw new PassWordInvalidException(ErrorCode.PASSWORD_REQUIRED, "");
         }
-
         if (password.length() < MIN_PASSWORD_LENGTH || password.length() > MAX_PASSWORD_LENGTH) {
             throw new PassWordInvalidException(ErrorCode.INVALID_PASSWORD_LENGTH, password);
         }
-
         if (!PASSWORD_PATTERN.matcher(password).matches()) {
             throw new PassWordInvalidException(ErrorCode.WEAK_PASSWORD, password);
         }

From 9c38ed31439a5a3279b8a17c34b1b744dcb36916 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?= <9712jw@gmail.com>
Date: Sun, 9 Feb 2025 00:37:37 +0900
Subject: [PATCH 16/38] =?UTF-8?q?feat:=20=EC=B1=84=EB=84=90=20=EB=8F=84?=
 =?UTF-8?q?=EB=A9=94=EC=9D=B8=20=EA=B5=AC=ED=98=84,=20=EC=B1=84=EB=84=90?=
 =?UTF-8?q?=20=EC=A0=80=EC=9E=A5,=20=EC=88=98=EC=A0=95=20=EB=A1=9C?=
 =?UTF-8?q?=EC=A7=81=EA=B5=AC=ED=98=84?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../ChangeChannelSubjectRequestDto.java       |  13 +++++
 .../dto/channel/CreateChannelRequestDto.java  |   9 ++++
 .../dto/user/ChangePasswordRequestDto.java    |   9 ++++
 .../dto/{ => user}/JoinUserReqeustDto.java    |   2 +-
 .../dto/{ => user}/LoginRequestDto.java       |   2 +-
 .../dto/{ => user}/UserResponseDto.java       |   2 +-
 .../service/channel/ChannelService.java       |  38 +++++++++++++
 .../application/service/user/UserService.java |  14 +++--
 .../service/user/converter/UserConverter.java |   4 +-
 .../discodeit/domain/channel/Channel.java     |  50 ++++++++++++++++++
 .../domain/channel/enums/ChannelType.java     |   6 +++
 .../ChannelNameInvalidException.java          |  11 ++++
 .../exception/ChannelNotFoundException.java   |  11 ++++
 .../mission/discodeit/domain/user/User.java   |   4 ++
 .../discodeit/global/error/ErrorCode.java     |  46 ++++++++--------
 .../channel/InMemoryChannelRepository.java    |  24 +++++++++
 .../channel/interfaces/ChannelRepository.java |  12 +++++
 .../application/service/UserServiceTest.java  |   2 +-
 .../discodeit/fake/domain/user/StubUser.java  |   2 +-
 .../1-sprint-mission/study/channelDomain.png  | Bin 0 -> 36018 bytes
 ...0 \353\252\250\353\215\270\353\247\201.md" |  15 +++++-
 21 files changed, 240 insertions(+), 36 deletions(-)
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/ChangeChannelSubjectRequestDto.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/CreateChannelRequestDto.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/user/ChangePasswordRequestDto.java
 rename codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/{ => user}/JoinUserReqeustDto.java (85%)
 rename codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/{ => user}/LoginRequestDto.java (72%)
 rename codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/{ => user}/UserResponseDto.java (62%)
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/ChannelService.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/enums/ChannelType.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/exception/ChannelNameInvalidException.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/exception/ChannelNotFoundException.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/InMemoryChannelRepository.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/interfaces/ChannelRepository.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/study/channelDomain.png

diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/ChangeChannelSubjectRequestDto.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/ChangeChannelSubjectRequestDto.java
new file mode 100644
index 000000000..d860ecba4
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/ChangeChannelSubjectRequestDto.java
@@ -0,0 +1,13 @@
+package com.sprint.mission.discodeit.application.dto.channel;
+
+import jakarta.validation.constraints.NotNull;
+import jakarta.validation.constraints.Size;
+import java.util.UUID;
+
+public record ChangeChannelSubjectRequestDto(
+        @NotNull
+        UUID channelId,
+        @Size(max = 1024, message = "채널 주제 길이는 1024이하 제한입니다.")
+        String subject
+) {
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/CreateChannelRequestDto.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/CreateChannelRequestDto.java
new file mode 100644
index 000000000..2315ce67c
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/CreateChannelRequestDto.java
@@ -0,0 +1,9 @@
+package com.sprint.mission.discodeit.application.dto.channel;
+
+import jakarta.validation.constraints.NotBlank;
+
+public record CreateChannelRequestDto(
+        @NotBlank String name,
+        @NotBlank String channelType
+) {
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/user/ChangePasswordRequestDto.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/user/ChangePasswordRequestDto.java
new file mode 100644
index 000000000..316855981
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/user/ChangePasswordRequestDto.java
@@ -0,0 +1,9 @@
+package com.sprint.mission.discodeit.application.dto.user;
+
+import jakarta.validation.constraints.NotBlank;
+
+public record ChangePasswordRequestDto(
+        @NotBlank
+        String password
+) {
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/JoinUserReqeustDto.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/user/JoinUserReqeustDto.java
similarity index 85%
rename from codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/JoinUserReqeustDto.java
rename to codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/user/JoinUserReqeustDto.java
index b6cbf36c8..a8ef94347 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/JoinUserReqeustDto.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/user/JoinUserReqeustDto.java
@@ -1,4 +1,4 @@
-package com.sprint.mission.discodeit.application.dto;
+package com.sprint.mission.discodeit.application.dto.user;
 
 import jakarta.validation.constraints.Email;
 import jakarta.validation.constraints.NotBlank;
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/LoginRequestDto.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/user/LoginRequestDto.java
similarity index 72%
rename from codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/LoginRequestDto.java
rename to codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/user/LoginRequestDto.java
index 64591d96d..c111579e5 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/LoginRequestDto.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/user/LoginRequestDto.java
@@ -1,4 +1,4 @@
-package com.sprint.mission.discodeit.application.dto;
+package com.sprint.mission.discodeit.application.dto.user;
 
 import jakarta.validation.constraints.NotBlank;
 
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/UserResponseDto.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/user/UserResponseDto.java
similarity index 62%
rename from codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/UserResponseDto.java
rename to codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/user/UserResponseDto.java
index dbe8eb232..cee99c944 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/UserResponseDto.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/user/UserResponseDto.java
@@ -1,4 +1,4 @@
-package com.sprint.mission.discodeit.application.dto;
+package com.sprint.mission.discodeit.application.dto.user;
 
 public record UserResponseDto(
     String nickname,
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/ChannelService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/ChannelService.java
new file mode 100644
index 000000000..42e2d4893
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/ChannelService.java
@@ -0,0 +1,38 @@
+package com.sprint.mission.discodeit.application.service.channel;
+
+import com.sprint.mission.discodeit.application.dto.channel.ChangeChannelSubjectRequestDto;
+import com.sprint.mission.discodeit.application.dto.channel.CreateChannelRequestDto;
+import com.sprint.mission.discodeit.domain.channel.Channel;
+import com.sprint.mission.discodeit.domain.channel.enums.ChannelType;
+import com.sprint.mission.discodeit.domain.channel.exception.ChannelNotFoundException;
+import com.sprint.mission.discodeit.global.error.ErrorCode;
+import com.sprint.mission.discodeit.repository.channel.interfaces.ChannelRepository;
+import java.util.UUID;
+
+public class ChannelService {
+
+    private final ChannelRepository channelRepository;
+
+    public ChannelService(
+            ChannelRepository channelRepository
+    ) {
+        this.channelRepository = channelRepository;
+    }
+
+    public void create(CreateChannelRequestDto requestDto) {
+        ChannelType channelType = ChannelType.valueOf(requestDto.channelType());
+        Channel createChannel = new Channel(requestDto.name(), channelType);
+        channelRepository.save(createChannel);
+    }
+
+    public Channel findOneByIdOrThrow(UUID id) {
+        return channelRepository.findOneById(id)
+                .orElseThrow(() -> new ChannelNotFoundException(ErrorCode.NOT_FOUND));
+    }
+
+    public void changeSubject(ChangeChannelSubjectRequestDto requestDto) {
+        Channel foundChannel = findOneByIdOrThrow(requestDto.channelId());
+        foundChannel.updateSubject(requestDto.subject());
+        channelRepository.save(foundChannel);
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/UserService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/UserService.java
index 524fdc913..e4ccff57e 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/UserService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/UserService.java
@@ -1,9 +1,10 @@
 package com.sprint.mission.discodeit.application.service.user;
 
 import com.sprint.mission.discodeit.application.auth.PasswordEncoder;
-import com.sprint.mission.discodeit.application.dto.JoinUserReqeustDto;
-import com.sprint.mission.discodeit.application.dto.LoginRequestDto;
-import com.sprint.mission.discodeit.application.dto.UserResponseDto;
+import com.sprint.mission.discodeit.application.dto.user.ChangePasswordRequestDto;
+import com.sprint.mission.discodeit.application.dto.user.JoinUserReqeustDto;
+import com.sprint.mission.discodeit.application.dto.user.LoginRequestDto;
+import com.sprint.mission.discodeit.application.dto.user.UserResponseDto;
 import com.sprint.mission.discodeit.application.service.user.converter.UserConverter;
 import com.sprint.mission.discodeit.domain.user.BirthDate;
 import com.sprint.mission.discodeit.domain.user.Email;
@@ -59,6 +60,13 @@ public User findOneByIdOrThrow(UUID uuid) {
                 .orElseThrow(() -> new UserNotFoundException(ErrorCode.NOT_FOUND));
     }
 
+    public void changePassword(UUID userId, ChangePasswordRequestDto requestDto) {
+        PasswordValidator.validateOrThrow(requestDto.password());
+        User foundUser = findOneByIdOrThrow(userId);
+        foundUser.updatePassword(passwordEncoder.encode(requestDto.password()));
+        userRepository.save(foundUser);
+    }
+
     private void throwEmailAlreadyUsed(String email) {
         if (userRepository.isExistByEmail(new Email(email))) {
             throw new AlreadyUserExistsException(ErrorCode.DUPLICATE_EMAIL, email);
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/converter/UserConverter.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/converter/UserConverter.java
index cd6514c8c..c204e5fa0 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/converter/UserConverter.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/converter/UserConverter.java
@@ -1,7 +1,7 @@
 package com.sprint.mission.discodeit.application.service.user.converter;
 
-import com.sprint.mission.discodeit.application.dto.JoinUserReqeustDto;
-import com.sprint.mission.discodeit.application.dto.UserResponseDto;
+import com.sprint.mission.discodeit.application.dto.user.JoinUserReqeustDto;
+import com.sprint.mission.discodeit.application.dto.user.UserResponseDto;
 import com.sprint.mission.discodeit.domain.user.BirthDate;
 import com.sprint.mission.discodeit.domain.user.Email;
 import com.sprint.mission.discodeit.domain.user.Nickname;
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java
new file mode 100644
index 000000000..541450de9
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java
@@ -0,0 +1,50 @@
+package com.sprint.mission.discodeit.domain.channel;
+
+import com.sprint.mission.discodeit.domain.channel.enums.ChannelType;
+import com.sprint.mission.discodeit.domain.channel.exception.ChannelNameInvalidException;
+import com.sprint.mission.discodeit.global.error.ErrorCode;
+import java.time.LocalDateTime;
+import java.util.Objects;
+import java.util.UUID;
+
+public class Channel {
+
+    private final static int SUBJECT_MAX_LENGTH = 1024;
+
+    private final UUID id;
+    private String name;
+    private String subject;
+    private ChannelType type;
+    private final LocalDateTime createdAt;
+    private LocalDateTime updatedAt;
+
+    public Channel(
+            String name,
+            ChannelType type
+    ) {
+        validate(name);
+        this.id = UUID.randomUUID();
+        this.name = name;
+        this.subject = "";
+        this.type = type;
+        createdAt = LocalDateTime.now();
+        updatedAt = LocalDateTime.now();
+    }
+
+    public void updateSubject(String subject) {
+        if (subject.length() > SUBJECT_MAX_LENGTH) {
+            throw new IllegalArgumentException();
+        }
+        this.subject = subject;
+    }
+
+    private void validate(String name) {
+        if (Objects.isNull(name) || name.isBlank()) {
+            throw new ChannelNameInvalidException(ErrorCode.INVALID_CHANNEL_NAME_LENGTH, name);
+        }
+    }
+
+    public UUID getId() {
+        return id;
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/enums/ChannelType.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/enums/ChannelType.java
new file mode 100644
index 000000000..010dd58fc
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/enums/ChannelType.java
@@ -0,0 +1,6 @@
+package com.sprint.mission.discodeit.domain.channel.enums;
+
+public enum ChannelType {
+    TEXT,
+    VOICE
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/exception/ChannelNameInvalidException.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/exception/ChannelNameInvalidException.java
new file mode 100644
index 000000000..8e84c9bd1
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/exception/ChannelNameInvalidException.java
@@ -0,0 +1,11 @@
+package com.sprint.mission.discodeit.domain.channel.exception;
+
+import com.sprint.mission.discodeit.global.error.ErrorCode;
+import com.sprint.mission.discodeit.global.error.exception.InvalidException;
+
+public class ChannelNameInvalidException extends InvalidException {
+
+    public ChannelNameInvalidException(ErrorCode errorCode, String message) {
+        super(errorCode, message);
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/exception/ChannelNotFoundException.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/exception/ChannelNotFoundException.java
new file mode 100644
index 000000000..a5f7e5349
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/exception/ChannelNotFoundException.java
@@ -0,0 +1,11 @@
+package com.sprint.mission.discodeit.domain.channel.exception;
+
+import com.sprint.mission.discodeit.global.error.ErrorCode;
+import com.sprint.mission.discodeit.global.error.exception.EntityNotFoundException;
+
+public class ChannelNotFoundException extends EntityNotFoundException {
+
+    public ChannelNotFoundException(ErrorCode errorCode) {
+        super(errorCode);
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/User.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/User.java
index edf96a5bd..806b11930 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/User.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/User.java
@@ -38,6 +38,10 @@ public User(
         this.emailSubscriptionStatus = emailSubscriptionStatus;
     }
 
+    public void updatePassword(String encodedPassword) {
+        password.changePassword(encodedPassword);
+    }
+
     public UUID getId() {
         return id;
     }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorCode.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorCode.java
index 4bf0d3a3e..c68597c64 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorCode.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorCode.java
@@ -3,39 +3,40 @@
 public enum ErrorCode {
 
     // common
-    NOT_FOUND(404, "요청한 데이터를 찾을 수 없습니다.", "C004"),
+    NOT_FOUND(404, "요청한 데이터를 찾을 수 없습니다."),
 
-    // User Domain
-    INVALID_USERNAME_LENGTH(400, "유저 이름은 1~32자 이내여야 합니다.", "U001"),
-    INVALID_NICKNAME_LENGTH(400, "유저 이름은 2~32자 이내여야 합니다.", "U002"),
-    INVALID_PASSWORD_LENGTH(400, "비밀번호는 8~20자 이내여야 합니다.", "U004"),  // 비밀번호 길이 오류
-    WEAK_PASSWORD(400, "비밀번호는 대문자, 숫자, 특수문자를 포함해야 합니다.", "U008"),
-    UNDERAGE_SIGNUP_REGISTERED(400, "13세 이상만 회원가입이 가능합니다.", "U009"),
+    // User
+    INVALID_USERNAME_LENGTH(400, "유저 이름은 1~32자 이내여야 합니다."),
+    INVALID_NICKNAME_LENGTH(400, "유저 이름은 2~32자 이내여야 합니다."),
+    INVALID_PASSWORD_LENGTH(400, "비밀번호는 8~20자 이내여야 합니다."),
+    WEAK_PASSWORD(400, "비밀번호는 대문자, 숫자, 특수문자를 포함해야 합니다."),
+    UNDERAGE_SIGNUP_REGISTERED(400, "13세 이상만 회원가입이 가능합니다."),
 
-    USERNAME_REQUIRED(400, "유저 이름은 필수입니다.", "U104"),
-    NICKNAME_REQUIRED(400, "닉네임은 필수입니다.", "U105"),
-    EMAIL_REQUIRED(400, "이메일은 필수입니다.", "U106"),
-    PASSWORD_REQUIRED(400, "비밀번호는 필수 입력값입니다.", "U107"),
-    BIRTHDATE_REQUIRED(400, "생년월일은 필수 입력값입니다.", "U108"),
+    USERNAME_REQUIRED(400, "유저 이름은 필수입니다."),
+    NICKNAME_REQUIRED(400, "닉네임은 필수입니다."),
+    EMAIL_REQUIRED(400, "이메일은 필수입니다."),
+    PASSWORD_REQUIRED(400, "비밀번호는 필수 입력값입니다."),
+    BIRTHDATE_REQUIRED(400, "생년월일은 필수 입력값입니다."),
 
-    INVALID_EMAIL_FORMAT(400, "이메일 형식이 올바르지 않습니다", "U203"),
-    INVALID_USERNAME_FORMAT(400, "유저 이름에 허용되지 않은 문자가 포함되어 있습니다.", "U205"),
-    INVALID_NICKNAME_FORMAT(400, "닉네임에 허용되지 않은 문자가 포함되어 있습니다.", "U206"),
+    INVALID_EMAIL_FORMAT(400, "이메일 형식이 올바르지 않습니다"),
+    INVALID_USERNAME_FORMAT(400, "유저 이름에 허용되지 않은 문자가 포함되어 있습니다."),
+    INVALID_NICKNAME_FORMAT(400, "닉네임에 허용되지 않은 문자가 포함되어 있습니다."),
 
-    DUPLICATE_EMAIL(400, "이미 사용중인 이메일입니다.", "U307"),
-    DUPLICATE_USERNAME(400, "이미 존재하는 유저이름입니다.", "U308"),
+    DUPLICATE_EMAIL(400, "이미 사용중인 이메일입니다."),
+    DUPLICATE_USERNAME(400, "이미 존재하는 유저이름입니다."),
 
-    INVALID_CREDENTIALS(400, "아이디 또는 비밀번호가 일치하지 않습니다.", "U501")
+    INVALID_CREDENTIALS(400, "아이디 또는 비밀번호가 일치하지 않습니다."),
+
+    // Channel
+    INVALID_CHANNEL_NAME_LENGTH(400, "채널 이름은 필수입니다."),
     ;
 
     private final int status;
     private final String description;
-    private final String code;
 
-    ErrorCode(int status, String description, String code) {
+    ErrorCode(int status, String description) {
         this.status = status;
         this.description = description;
-        this.code = code;
     }
 
     public int getStatus() {
@@ -46,7 +47,4 @@ public String getDescription() {
         return description;
     }
 
-    public String getCode() {
-        return code;
-    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/InMemoryChannelRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/InMemoryChannelRepository.java
new file mode 100644
index 000000000..911bcc668
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/InMemoryChannelRepository.java
@@ -0,0 +1,24 @@
+package com.sprint.mission.discodeit.repository.channel;
+
+import com.sprint.mission.discodeit.domain.channel.Channel;
+import com.sprint.mission.discodeit.repository.channel.interfaces.ChannelRepository;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Optional;
+import java.util.UUID;
+
+public class InMemoryChannelRepository implements ChannelRepository {
+
+    private final Map<UUID, Channel> uuidChannels = new HashMap<>();
+
+    @Override
+    public Channel save(Channel channel) {
+        Channel savedChannel = uuidChannels.put(channel.getId(), channel);
+        return channel;
+    }
+
+    @Override
+    public Optional<Channel> findOneById(UUID uuid) {
+        return Optional.ofNullable(uuidChannels.get(uuid));
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/interfaces/ChannelRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/interfaces/ChannelRepository.java
new file mode 100644
index 000000000..663dffde0
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/interfaces/ChannelRepository.java
@@ -0,0 +1,12 @@
+package com.sprint.mission.discodeit.repository.channel.interfaces;
+
+import com.sprint.mission.discodeit.domain.channel.Channel;
+import java.util.Optional;
+import java.util.UUID;
+
+public interface ChannelRepository {
+
+    Channel save(Channel channel);
+
+    Optional<Channel> findOneById(UUID uuid);
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/application/service/UserServiceTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/application/service/UserServiceTest.java
index 9ad8465df..94f698f1d 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/application/service/UserServiceTest.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/application/service/UserServiceTest.java
@@ -1,6 +1,6 @@
 package com.sprint.mission.discodeit.application.service;
 
-import com.sprint.mission.discodeit.application.dto.JoinUserReqeustDto;
+import com.sprint.mission.discodeit.application.dto.user.JoinUserReqeustDto;
 import com.sprint.mission.discodeit.application.service.user.UserService;
 import com.sprint.mission.discodeit.domain.user.exception.AlreadyUserExistsException;
 import com.sprint.mission.discodeit.fake.FakeFactory;
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/domain/user/StubUser.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/domain/user/StubUser.java
index 3926dd5c2..1daa6d6be 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/domain/user/StubUser.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/domain/user/StubUser.java
@@ -1,6 +1,6 @@
 package com.sprint.mission.discodeit.fake.domain.user;
 
-import com.sprint.mission.discodeit.application.dto.JoinUserReqeustDto;
+import com.sprint.mission.discodeit.application.dto.user.JoinUserReqeustDto;
 import com.sprint.mission.discodeit.domain.user.BirthDate;
 import com.sprint.mission.discodeit.domain.user.Email;
 import com.sprint.mission.discodeit.domain.user.Nickname;
diff --git a/codeit-bootcamp-spring/1-sprint-mission/study/channelDomain.png b/codeit-bootcamp-spring/1-sprint-mission/study/channelDomain.png
new file mode 100644
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zl-@wNpG=7K)s=Z1Z^Yi8$@J|GFv&xo@ZoP+F%*Iq;9Y(AyhsY6Uh=lyk=BOPcjrh`
z+bv%9elhV8G<&yt6FcXm&=h;z*wInI+Hg5OFX-qih$T`pKScwkV=l#&<6?I4bY|w%
zU}bt~E-x4wC^yVMxvCauyyM+-uVtQOQN1a1adq_I6~ehR>;vNsH4=oPD`nKw5Y;Ye
zIb-W;q+%7w^-dUC&aJPaEzTxm)hMv;S4u!L{owbs_*ljT>tEc)Frk4h&CiiVJ}MJR
zSj(!!^&r)y(F3(NTEkQae*BXGM`J;3)R<$$Mcx#b(eb&heq@Vrsbz6=4BMo*`@U?|
z_nFwwH5+pXOBGCQ^h~Up+$nu5{pYJ&Yf`DfK0|i)Gp@pc-<)lh*U#9*S19!MY;g3h
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zp4E3-mJau}Xf&;^21_5se+X(k?&qoL(3gv|h%YEisSsYWjviAsi-PQKy|qE_Aqu=0
z3|VPT`#&zS*DJ4^=*gA&`8pw4sww<3ZsePJ0QnaE$Cb%0IA@leDPh;&J2%35r<o)!
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zK>Idr;ea1yHVvx{prOxgHPzpfo=3AydPMPswYA?%@6Z=8yZZxKjCdD(?6n8DdDR4N
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zyJ1<bOJC>&LcukwWHlhQH{5(p^3Y`P?qa#dSL&n>PimEwogN>^%HxpTK7q_%hxS$s
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zT-2=kvIgPYFL1L%`d+7UAGpG7HHEfzp9^i-+|BUSBtfJObw^FfWC6~oZSdh2kMpEp
zbs9nfQFc*NQGBN^D9Pa7*x8{a>RFsnHNT}!UYe+P_|im!mU-Y=^w??b9%~E5yP~tT
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zcXQiW1y%vAJ_bwm^@M)te&&>_8ti?MCFs)Cx+cR>evciyh4Tfnp7+;!H8lDa`sLn0
z^*RH_!bT8Kr$;Nnjopgz=NSVt9>}2a7qM;Z<8D`IS`W_aN7EZAZAA$92x`P~WUjy0
z_R6ict4bRttb*y5xUfri_|uu*#*clcSzwGqe3uQ(K&Qu)`b%ZjX+Ly1bv_kmJpXN7
zojajO9FaBNO=jT3qQhOCKJr!0r7q52Cf+5TH=1T}E7LmBI&(&Gy=Nn@w`KLm-E!Hd
zs$Xx%G{?@fUQ%MAoEuj*sEG(>T;3l|=CX&C%e~pLwh(l*JS?dF)?o;+ubZ#jzrhwx
a&uRD24h`H0?F3{iiK>#OVwt>o*#7~P@I&MP

literal 0
HcmV?d00001

diff --git "a/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md" "b/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md"
index 74d2b3c05..154699977 100644
--- "a/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md"	
+++ "b/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md"	
@@ -32,14 +32,25 @@
     - 유저의 비밀번호가 틀리다면 에러를 반환한다.
 
 - 비밀번호 변경
+  - flow
+    - 본인이 맞는지 기존 비밀번호를 확인한다.
+    - 변경 비밀번호를 입력받는다.
+    - 디비에서 유저조회
+    - 조횐된 유저의 비밀번호를 암호화 후 변경
+    - 디비에 저장
+  - 리팩터링할 부분 : 토큰으로 일회용 토큰으로 기존 비밀번호 확인 후 토큰이 없다면 불가하게 하는방법 구현하기
 - 수신 여부 변경
 
 ## 채널
 - 새로운 채널 생성
-  - 
+  - `채널이름`, `채널 유형`을 입력받는다.
+    - 텍스트 채널 유형
+    - 음성, 영상, 화면 유형
+    - 채널 주제 (생성 시에는 입력받지 않음, 1024 글자 제한)
 - 채널 삭제
 - 채널 정보 수정
-
+  - 이름 수정
+  - 채널 주제 수정 1024 글자제한
 
 ## 메세지
 - 새로운 메시지 생성

From 07a68cd623533a4f9a26c63ebb71b68e44b32263 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?=
 <157946706+jaewoo9797@users.noreply.github.com>
Date: Mon, 10 Feb 2025 09:55:36 +0900
Subject: [PATCH 17/38] =?UTF-8?q?feat:=20message=20=EC=83=9D=EC=84=B1=20?=
 =?UTF-8?q?=EB=A1=9C=EC=A7=81=20=EA=B5=AC=ED=98=84?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../channel/ChangeChannelNameRequestDto.java  | 11 ++++
 .../ChangeChannelSubjectRequestDto.java       |  4 +-
 .../dto/channel/DeleteChannelRequestDto.java  |  9 ++++
 .../dto/message/CreateMessageRequestDto.java  | 12 +++++
 .../dto/message/MessageResponseDto.java       | 19 +++++++
 .../service/channel/ChannelService.java       | 15 +++++-
 .../service/message/MessageService.java       | 34 ++++++++++++
 .../discodeit/domain/channel/Channel.java     |  9 +++-
 .../ChannelSubjectOverLengthException.java    | 11 ++++
 .../discodeit/domain/message/Message.java     | 52 +++++++++++++++++++
 .../InvalidMessageContentException.java       | 11 ++++
 .../discodeit/global/error/ErrorCode.java     |  7 ++-
 .../channel/InMemoryChannelRepository.java    |  5 ++
 .../channel/interfaces/ChannelRepository.java |  2 +
 .../message/interfaces/MessageRepository.java |  9 ++++
 ...0 \353\252\250\353\215\270\353\247\201.md" |  4 +-
 16 files changed, 206 insertions(+), 8 deletions(-)
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/ChangeChannelNameRequestDto.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/DeleteChannelRequestDto.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/message/CreateMessageRequestDto.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/message/MessageResponseDto.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/MessageService.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/exception/ChannelSubjectOverLengthException.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/message/Message.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/message/exception/InvalidMessageContentException.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/interfaces/MessageRepository.java

diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/ChangeChannelNameRequestDto.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/ChangeChannelNameRequestDto.java
new file mode 100644
index 000000000..757171558
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/ChangeChannelNameRequestDto.java
@@ -0,0 +1,11 @@
+package com.sprint.mission.discodeit.application.dto.channel;
+
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.NotNull;
+import java.util.UUID;
+
+public record ChangeChannelNameRequestDto(
+        @NotNull UUID channelId,
+        @NotBlank String channelName
+) {
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/ChangeChannelSubjectRequestDto.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/ChangeChannelSubjectRequestDto.java
index d860ecba4..d5dea9a01 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/ChangeChannelSubjectRequestDto.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/ChangeChannelSubjectRequestDto.java
@@ -5,8 +5,8 @@
 import java.util.UUID;
 
 public record ChangeChannelSubjectRequestDto(
-        @NotNull
-        UUID channelId,
+        @NotNull UUID channelId,
+
         @Size(max = 1024, message = "채널 주제 길이는 1024이하 제한입니다.")
         String subject
 ) {
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/DeleteChannelRequestDto.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/DeleteChannelRequestDto.java
new file mode 100644
index 000000000..4a89ca69c
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/DeleteChannelRequestDto.java
@@ -0,0 +1,9 @@
+package com.sprint.mission.discodeit.application.dto.channel;
+
+import jakarta.validation.constraints.NotNull;
+import java.util.UUID;
+
+public record DeleteChannelRequestDto(
+        @NotNull UUID channelId
+) {
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/message/CreateMessageRequestDto.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/message/CreateMessageRequestDto.java
new file mode 100644
index 000000000..2b13aa643
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/message/CreateMessageRequestDto.java
@@ -0,0 +1,12 @@
+package com.sprint.mission.discodeit.application.dto.message;
+
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.NotNull;
+import java.util.UUID;
+
+public record CreateMessageRequestDto(
+        @NotBlank String content,
+        @NotNull UUID userId,
+        @NotNull UUID destinationChannelId
+) {
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/message/MessageResponseDto.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/message/MessageResponseDto.java
new file mode 100644
index 000000000..10af2d9cd
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/message/MessageResponseDto.java
@@ -0,0 +1,19 @@
+package com.sprint.mission.discodeit.application.dto.message;
+
+import com.sprint.mission.discodeit.domain.message.Message;
+import java.util.UUID;
+
+public record MessageResponseDto(
+        UUID messageId,
+        String content,
+        String senderName,
+        UUID destinationChannelId
+) {
+    public static MessageResponseDto from(Message message) {
+        return new MessageResponseDto(
+                message.getId(),
+                message.getSenderName(),
+                message.getContent(),
+                message.getDestinationChannelId());
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/ChannelService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/ChannelService.java
index 42e2d4893..531261e1e 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/ChannelService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/ChannelService.java
@@ -1,7 +1,9 @@
 package com.sprint.mission.discodeit.application.service.channel;
 
+import com.sprint.mission.discodeit.application.dto.channel.ChangeChannelNameRequestDto;
 import com.sprint.mission.discodeit.application.dto.channel.ChangeChannelSubjectRequestDto;
 import com.sprint.mission.discodeit.application.dto.channel.CreateChannelRequestDto;
+import com.sprint.mission.discodeit.application.dto.channel.DeleteChannelRequestDto;
 import com.sprint.mission.discodeit.domain.channel.Channel;
 import com.sprint.mission.discodeit.domain.channel.enums.ChannelType;
 import com.sprint.mission.discodeit.domain.channel.exception.ChannelNotFoundException;
@@ -20,7 +22,7 @@ public ChannelService(
     }
 
     public void create(CreateChannelRequestDto requestDto) {
-        ChannelType channelType = ChannelType.valueOf(requestDto.channelType());
+        ChannelType channelType = ChannelType.valueOf(requestDto.channelType());    // TODO 예외 발생할 수 있음 -> 이넘타입에 존재하지 않을 경우
         Channel createChannel = new Channel(requestDto.name(), channelType);
         channelRepository.save(createChannel);
     }
@@ -35,4 +37,15 @@ public void changeSubject(ChangeChannelSubjectRequestDto requestDto) {
         foundChannel.updateSubject(requestDto.subject());
         channelRepository.save(foundChannel);
     }
+
+    public void changeChannelName(ChangeChannelNameRequestDto requestDto) {
+        Channel foundChannel = findOneByIdOrThrow(requestDto.channelId());
+        foundChannel.updateName(requestDto.channelName());
+        channelRepository.save(foundChannel);
+    }
+
+    public void deleteChannel(DeleteChannelRequestDto requestDto) {
+        Channel foundChannel = findOneByIdOrThrow(requestDto.channelId());
+        channelRepository.deleteById(foundChannel.getId());
+    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/MessageService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/MessageService.java
new file mode 100644
index 000000000..58f3bd154
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/MessageService.java
@@ -0,0 +1,34 @@
+package com.sprint.mission.discodeit.application.service.message;
+
+import com.sprint.mission.discodeit.application.dto.message.CreateMessageRequestDto;
+import com.sprint.mission.discodeit.application.dto.message.MessageResponseDto;
+import com.sprint.mission.discodeit.application.service.channel.ChannelService;
+import com.sprint.mission.discodeit.application.service.user.UserService;
+import com.sprint.mission.discodeit.domain.channel.Channel;
+import com.sprint.mission.discodeit.domain.message.Message;
+import com.sprint.mission.discodeit.domain.user.User;
+import com.sprint.mission.discodeit.repository.message.interfaces.MessageRepository;
+
+public class MessageService {
+
+    private final MessageRepository messageRepository;
+    private final ChannelService channelService;
+    private final UserService userService;
+
+    public MessageService(
+            MessageRepository messageRepository,
+            ChannelService channelService,
+            UserService userService
+    ) {
+        this.messageRepository = messageRepository;
+        this.channelService = channelService;
+        this.userService = userService;
+    }
+
+    public MessageResponseDto createMessage(CreateMessageRequestDto requestDto) {
+        User sender = userService.findOneByIdOrThrow(requestDto.userId());
+        Channel destinationChannel = channelService.findOneByIdOrThrow(requestDto.destinationChannelId());
+        Message createMessage = messageRepository.save(new Message(sender, destinationChannel, requestDto.content()));
+        return MessageResponseDto.from(createMessage);
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java
index 541450de9..a209e9e28 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java
@@ -2,6 +2,7 @@
 
 import com.sprint.mission.discodeit.domain.channel.enums.ChannelType;
 import com.sprint.mission.discodeit.domain.channel.exception.ChannelNameInvalidException;
+import com.sprint.mission.discodeit.domain.channel.exception.ChannelSubjectOverLengthException;
 import com.sprint.mission.discodeit.global.error.ErrorCode;
 import java.time.LocalDateTime;
 import java.util.Objects;
@@ -33,14 +34,18 @@ public Channel(
 
     public void updateSubject(String subject) {
         if (subject.length() > SUBJECT_MAX_LENGTH) {
-            throw new IllegalArgumentException();
+            throw new ChannelSubjectOverLengthException(ErrorCode.INVALID_SUBJECT_LENGTH, "입력 글자 수:".concat(String.valueOf(subject.length())));
         }
         this.subject = subject;
     }
 
+    public void updateName(String name) {
+        this.name = name.trim();
+    }
+
     private void validate(String name) {
         if (Objects.isNull(name) || name.isBlank()) {
-            throw new ChannelNameInvalidException(ErrorCode.INVALID_CHANNEL_NAME_LENGTH, name);
+            throw new ChannelNameInvalidException(ErrorCode.INVALID_CHANNEL_NAME_NOT_NULL, name);
         }
     }
 
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/exception/ChannelSubjectOverLengthException.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/exception/ChannelSubjectOverLengthException.java
new file mode 100644
index 000000000..054e6fa7d
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/exception/ChannelSubjectOverLengthException.java
@@ -0,0 +1,11 @@
+package com.sprint.mission.discodeit.domain.channel.exception;
+
+import com.sprint.mission.discodeit.global.error.ErrorCode;
+import com.sprint.mission.discodeit.global.error.exception.InvalidException;
+
+public class ChannelSubjectOverLengthException extends InvalidException {
+
+    public ChannelSubjectOverLengthException(ErrorCode errorCode, String message) {
+        super(errorCode, message);
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/message/Message.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/message/Message.java
new file mode 100644
index 000000000..cabcb1d80
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/message/Message.java
@@ -0,0 +1,52 @@
+package com.sprint.mission.discodeit.domain.message;
+
+import com.sprint.mission.discodeit.domain.channel.Channel;
+import com.sprint.mission.discodeit.domain.message.exception.InvalidMessageContentException;
+import com.sprint.mission.discodeit.domain.user.User;
+import com.sprint.mission.discodeit.global.error.ErrorCode;
+import java.time.LocalDateTime;
+import java.util.Objects;
+import java.util.UUID;
+
+public class Message {
+
+    private final UUID id;
+    private final LocalDateTime createdAt;
+    private LocalDateTime updatedAt;
+    private final User sender;
+    private final Channel destinationChannel;
+    private String content;
+
+    public Message(User sender, Channel destinationChannel, String content) {
+        validate(content);
+        this.id = UUID.randomUUID();
+        this.sender = sender;
+        this.destinationChannel = destinationChannel;
+        this.content = content;
+        this.createdAt = LocalDateTime.now();
+        this.updatedAt = LocalDateTime.now();
+    }
+
+    private void validate(String content) {
+        if (Objects.isNull(content) || content.isBlank()) {
+            throw new InvalidMessageContentException(ErrorCode.INVALID_MESSAGE_CONTENT_NOT_NULL, content);
+        }
+    }
+
+    public UUID getId() {
+        return id;
+    }
+
+    public String getContent() {
+        return content;
+    }
+
+    public String getSenderName() {
+        return sender.getNicknameValue();
+    }
+
+    public UUID getDestinationChannelId() {
+        return destinationChannel.getId();
+    }
+
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/message/exception/InvalidMessageContentException.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/message/exception/InvalidMessageContentException.java
new file mode 100644
index 000000000..5739ff452
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/message/exception/InvalidMessageContentException.java
@@ -0,0 +1,11 @@
+package com.sprint.mission.discodeit.domain.message.exception;
+
+import com.sprint.mission.discodeit.global.error.ErrorCode;
+import com.sprint.mission.discodeit.global.error.exception.InvalidException;
+
+public class InvalidMessageContentException extends InvalidException {
+
+    public InvalidMessageContentException(ErrorCode errorCode, String message) {
+        super(errorCode, message);
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorCode.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorCode.java
index c68597c64..94e5dedaa 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorCode.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorCode.java
@@ -4,7 +4,7 @@ public enum ErrorCode {
 
     // common
     NOT_FOUND(404, "요청한 데이터를 찾을 수 없습니다."),
-
+    INVALID_SUBJECT_LENGTH(400, "채널 주제는 최대 1024자 이내여야 합니다."),
     // User
     INVALID_USERNAME_LENGTH(400, "유저 이름은 1~32자 이내여야 합니다."),
     INVALID_NICKNAME_LENGTH(400, "유저 이름은 2~32자 이내여야 합니다."),
@@ -28,7 +28,10 @@ public enum ErrorCode {
     INVALID_CREDENTIALS(400, "아이디 또는 비밀번호가 일치하지 않습니다."),
 
     // Channel
-    INVALID_CHANNEL_NAME_LENGTH(400, "채널 이름은 필수입니다."),
+    INVALID_CHANNEL_NAME_NOT_NULL(400, "채널 이름은 필수 입력값 입니다."),
+
+    // Message
+    INVALID_MESSAGE_CONTENT_NOT_NULL(400, "메시지 내용은 필수 입력값 입니다."),
     ;
 
     private final int status;
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/InMemoryChannelRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/InMemoryChannelRepository.java
index 911bcc668..b133fb177 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/InMemoryChannelRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/InMemoryChannelRepository.java
@@ -21,4 +21,9 @@ public Channel save(Channel channel) {
     public Optional<Channel> findOneById(UUID uuid) {
         return Optional.ofNullable(uuidChannels.get(uuid));
     }
+
+    @Override
+    public void deleteById(UUID uuid) {
+        uuidChannels.remove(uuid);
+    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/interfaces/ChannelRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/interfaces/ChannelRepository.java
index 663dffde0..767a7f1ee 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/interfaces/ChannelRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/interfaces/ChannelRepository.java
@@ -9,4 +9,6 @@ public interface ChannelRepository {
     Channel save(Channel channel);
 
     Optional<Channel> findOneById(UUID uuid);
+
+    void deleteById(UUID uuid);
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/interfaces/MessageRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/interfaces/MessageRepository.java
new file mode 100644
index 000000000..078dd530b
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/interfaces/MessageRepository.java
@@ -0,0 +1,9 @@
+package com.sprint.mission.discodeit.repository.message.interfaces;
+
+import com.sprint.mission.discodeit.domain.message.Message;
+
+public interface MessageRepository {
+
+    Message save(Message message);
+
+}
diff --git "a/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md" "b/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md"
index 154699977..96928068b 100644
--- "a/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md"	
+++ "b/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md"	
@@ -53,8 +53,10 @@
   - 채널 주제 수정 1024 글자제한
 
 ## 메세지
+
 - 새로운 메시지 생성
-  - 
+  - `메시지 id`, `메시지 생성, 수정시간`, `메시지 내용`, `보낸사람`, `목적지 채널`
+    - 메시지 내용은 비어있을 수 없다.
 - 메시지 내용 수정
 - 메시지 삭제
 

From 94f27cb1cae991bfe67a80d6b52aa88284ac479a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?=
 <157946706+jaewoo9797@users.noreply.github.com>
Date: Mon, 10 Feb 2025 10:03:17 +0900
Subject: [PATCH 18/38] =?UTF-8?q?feat:=20message=20=EC=88=98=EC=A0=95=20?=
 =?UTF-8?q?=EC=82=AD=EC=A0=9C=20=EA=B8=B0=EB=8A=A5=20=EA=B5=AC=ED=98=84?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../dto/message/DeleteMessageRequestDto.java  |  9 +++++++++
 .../UpdateMessageContentRequestDto.java       | 11 ++++++++++
 .../service/message/MessageService.java       | 20 +++++++++++++++++++
 .../discodeit/domain/message/Message.java     |  5 +++++
 .../exception/MessageNotFoundException.java   | 11 ++++++++++
 .../message/interfaces/MessageRepository.java |  5 +++++
 6 files changed, 61 insertions(+)
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/message/DeleteMessageRequestDto.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/message/UpdateMessageContentRequestDto.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/message/exception/MessageNotFoundException.java

diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/message/DeleteMessageRequestDto.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/message/DeleteMessageRequestDto.java
new file mode 100644
index 000000000..31656c421
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/message/DeleteMessageRequestDto.java
@@ -0,0 +1,9 @@
+package com.sprint.mission.discodeit.application.dto.message;
+
+import jakarta.validation.constraints.NotNull;
+import java.util.UUID;
+
+public record DeleteMessageRequestDto(
+        @NotNull UUID messageId
+) {
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/message/UpdateMessageContentRequestDto.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/message/UpdateMessageContentRequestDto.java
new file mode 100644
index 000000000..615039b16
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/message/UpdateMessageContentRequestDto.java
@@ -0,0 +1,11 @@
+package com.sprint.mission.discodeit.application.dto.message;
+
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.NotNull;
+import java.util.UUID;
+
+public record UpdateMessageContentRequestDto(
+        @NotNull UUID messageId,
+        @NotBlank String content
+) {
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/MessageService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/MessageService.java
index 58f3bd154..0b6d660d9 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/MessageService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/MessageService.java
@@ -1,13 +1,18 @@
 package com.sprint.mission.discodeit.application.service.message;
 
 import com.sprint.mission.discodeit.application.dto.message.CreateMessageRequestDto;
+import com.sprint.mission.discodeit.application.dto.message.DeleteMessageRequestDto;
 import com.sprint.mission.discodeit.application.dto.message.MessageResponseDto;
+import com.sprint.mission.discodeit.application.dto.message.UpdateMessageContentRequestDto;
 import com.sprint.mission.discodeit.application.service.channel.ChannelService;
 import com.sprint.mission.discodeit.application.service.user.UserService;
 import com.sprint.mission.discodeit.domain.channel.Channel;
 import com.sprint.mission.discodeit.domain.message.Message;
+import com.sprint.mission.discodeit.domain.message.exception.MessageNotFoundException;
 import com.sprint.mission.discodeit.domain.user.User;
+import com.sprint.mission.discodeit.global.error.ErrorCode;
 import com.sprint.mission.discodeit.repository.message.interfaces.MessageRepository;
+import java.util.UUID;
 
 public class MessageService {
 
@@ -31,4 +36,19 @@ public MessageResponseDto createMessage(CreateMessageRequestDto requestDto) {
         Message createMessage = messageRepository.save(new Message(sender, destinationChannel, requestDto.content()));
         return MessageResponseDto.from(createMessage);
     }
+
+    public void updateMessage(UpdateMessageContentRequestDto requestDto) {
+        Message foundMessage = findOneByIdOrThrow(requestDto.messageId());
+        foundMessage.updateContent(requestDto.content());
+        messageRepository.save(foundMessage);
+    }
+
+    public void deleteMessage(DeleteMessageRequestDto requestDto) {
+        Message foundMessage = findOneByIdOrThrow(requestDto.messageId());
+        messageRepository.deleteById(foundMessage.getId());
+    }
+
+    public Message findOneByIdOrThrow(UUID messageId) {
+        return messageRepository.findById(messageId).orElseThrow(() -> new MessageNotFoundException(ErrorCode.NOT_FOUND));
+    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/message/Message.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/message/Message.java
index cabcb1d80..d1a9550a4 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/message/Message.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/message/Message.java
@@ -27,6 +27,11 @@ public Message(User sender, Channel destinationChannel, String content) {
         this.updatedAt = LocalDateTime.now();
     }
 
+    public void updateContent(String content) {
+        validate(content);
+        this.content = content;
+    }
+
     private void validate(String content) {
         if (Objects.isNull(content) || content.isBlank()) {
             throw new InvalidMessageContentException(ErrorCode.INVALID_MESSAGE_CONTENT_NOT_NULL, content);
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/message/exception/MessageNotFoundException.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/message/exception/MessageNotFoundException.java
new file mode 100644
index 000000000..718cdbad1
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/message/exception/MessageNotFoundException.java
@@ -0,0 +1,11 @@
+package com.sprint.mission.discodeit.domain.message.exception;
+
+import com.sprint.mission.discodeit.global.error.ErrorCode;
+import com.sprint.mission.discodeit.global.error.exception.EntityNotFoundException;
+
+public class MessageNotFoundException extends EntityNotFoundException {
+
+    public MessageNotFoundException(ErrorCode errorCode) {
+        super(errorCode);
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/interfaces/MessageRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/interfaces/MessageRepository.java
index 078dd530b..252d39325 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/interfaces/MessageRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/interfaces/MessageRepository.java
@@ -1,9 +1,14 @@
 package com.sprint.mission.discodeit.repository.message.interfaces;
 
 import com.sprint.mission.discodeit.domain.message.Message;
+import java.util.Optional;
+import java.util.UUID;
 
 public interface MessageRepository {
 
     Message save(Message message);
 
+    Optional<Message> findById(UUID uuid);
+
+    void deleteById(UUID uuid);
 }

From 25330760cd484f4a0ca82263d0f4c0ae9e3173ef Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?=
 <157946706+jaewoo9797@users.noreply.github.com>
Date: Mon, 10 Feb 2025 10:21:18 +0900
Subject: [PATCH 19/38] =?UTF-8?q?refactor:=20service=20=EB=A0=88=EC=9D=B4?=
 =?UTF-8?q?=EC=96=B4=20=EC=9D=B8=ED=84=B0=ED=8E=98=EC=9D=B4=EC=8A=A4=20?=
 =?UTF-8?q?=EB=A7=8C=EB=93=A4=EA=B8=B0?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../dto/channel/ChannelResponseDto.java       | 21 ++++++++++++++++++
 ...eqeustDto.java => joinUserRequestDto.java} |  2 +-
 ...nelService.java => JCFChannelService.java} | 16 ++++++++++----
 .../service/interfaces/ChannelService.java    | 22 +++++++++++++++++++
 .../service/interfaces/MessageService.java    | 19 ++++++++++++++++
 .../service/interfaces/UserService.java       | 20 +++++++++++++++++
 ...ageService.java => JCFMessageService.java} | 21 +++++++++++-------
 .../{UserService.java => JCFUserService.java} | 15 ++++++++-----
 .../service/user/converter/UserConverter.java |  4 ++--
 .../discodeit/domain/channel/Channel.java     | 15 ++++++++++++-
 .../application/service/UserServiceTest.java  | 12 +++++-----
 .../mission/discodeit/fake/FakeFactory.java   |  6 ++---
 .../discodeit/fake/domain/user/StubUser.java  | 14 ++++++------
 13 files changed, 150 insertions(+), 37 deletions(-)
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/ChannelResponseDto.java
 rename codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/user/{JoinUserReqeustDto.java => joinUserRequestDto.java} (91%)
 rename codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/{ChannelService.java => JCFChannelService.java} (80%)
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/ChannelService.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/MessageService.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/UserService.java
 rename codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/{MessageService.java => JCFMessageService.java} (81%)
 rename codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/{UserService.java => JCFUserService.java} (91%)

diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/ChannelResponseDto.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/ChannelResponseDto.java
new file mode 100644
index 000000000..2aafb3304
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/ChannelResponseDto.java
@@ -0,0 +1,21 @@
+package com.sprint.mission.discodeit.application.dto.channel;
+
+import com.sprint.mission.discodeit.domain.channel.Channel;
+import java.util.UUID;
+
+public record ChannelResponseDto(
+        UUID channelId,
+        String name,
+        String subject,
+        String channelType
+) {
+
+    public static ChannelResponseDto from(Channel channel) {
+        return new ChannelResponseDto(
+                channel.getId(),
+                channel.getName(),
+                channel.getSubject(),
+                channel.getType()
+        );
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/user/JoinUserReqeustDto.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/user/joinUserRequestDto.java
similarity index 91%
rename from codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/user/JoinUserReqeustDto.java
rename to codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/user/joinUserRequestDto.java
index a8ef94347..d5f7c11d2 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/user/JoinUserReqeustDto.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/user/joinUserRequestDto.java
@@ -5,7 +5,7 @@
 import jakarta.validation.constraints.NotNull;
 import java.time.LocalDate;
 
-public record JoinUserReqeustDto(
+public record joinUserRequestDto(
     @NotBlank String nickname,
     @NotBlank String username,
     @Email String email,
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/ChannelService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java
similarity index 80%
rename from codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/ChannelService.java
rename to codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java
index 531261e1e..b1a7d1e02 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/ChannelService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java
@@ -2,8 +2,10 @@
 
 import com.sprint.mission.discodeit.application.dto.channel.ChangeChannelNameRequestDto;
 import com.sprint.mission.discodeit.application.dto.channel.ChangeChannelSubjectRequestDto;
+import com.sprint.mission.discodeit.application.dto.channel.ChannelResponseDto;
 import com.sprint.mission.discodeit.application.dto.channel.CreateChannelRequestDto;
 import com.sprint.mission.discodeit.application.dto.channel.DeleteChannelRequestDto;
+import com.sprint.mission.discodeit.application.service.interfaces.ChannelService;
 import com.sprint.mission.discodeit.domain.channel.Channel;
 import com.sprint.mission.discodeit.domain.channel.enums.ChannelType;
 import com.sprint.mission.discodeit.domain.channel.exception.ChannelNotFoundException;
@@ -11,39 +13,45 @@
 import com.sprint.mission.discodeit.repository.channel.interfaces.ChannelRepository;
 import java.util.UUID;
 
-public class ChannelService {
+public class JCFChannelService implements ChannelService {
 
     private final ChannelRepository channelRepository;
 
-    public ChannelService(
+    public JCFChannelService(
             ChannelRepository channelRepository
     ) {
         this.channelRepository = channelRepository;
     }
 
-    public void create(CreateChannelRequestDto requestDto) {
+    @Override
+    public ChannelResponseDto create(CreateChannelRequestDto requestDto) {
         ChannelType channelType = ChannelType.valueOf(requestDto.channelType());    // TODO 예외 발생할 수 있음 -> 이넘타입에 존재하지 않을 경우
         Channel createChannel = new Channel(requestDto.name(), channelType);
-        channelRepository.save(createChannel);
+        Channel savedChannel = channelRepository.save(createChannel);
+        return ChannelResponseDto.from(savedChannel);
     }
 
+    @Override
     public Channel findOneByIdOrThrow(UUID id) {
         return channelRepository.findOneById(id)
                 .orElseThrow(() -> new ChannelNotFoundException(ErrorCode.NOT_FOUND));
     }
 
+    @Override
     public void changeSubject(ChangeChannelSubjectRequestDto requestDto) {
         Channel foundChannel = findOneByIdOrThrow(requestDto.channelId());
         foundChannel.updateSubject(requestDto.subject());
         channelRepository.save(foundChannel);
     }
 
+    @Override
     public void changeChannelName(ChangeChannelNameRequestDto requestDto) {
         Channel foundChannel = findOneByIdOrThrow(requestDto.channelId());
         foundChannel.updateName(requestDto.channelName());
         channelRepository.save(foundChannel);
     }
 
+    @Override
     public void deleteChannel(DeleteChannelRequestDto requestDto) {
         Channel foundChannel = findOneByIdOrThrow(requestDto.channelId());
         channelRepository.deleteById(foundChannel.getId());
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/ChannelService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/ChannelService.java
new file mode 100644
index 000000000..2f09e5671
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/ChannelService.java
@@ -0,0 +1,22 @@
+package com.sprint.mission.discodeit.application.service.interfaces;
+
+import com.sprint.mission.discodeit.application.dto.channel.ChangeChannelNameRequestDto;
+import com.sprint.mission.discodeit.application.dto.channel.ChangeChannelSubjectRequestDto;
+import com.sprint.mission.discodeit.application.dto.channel.ChannelResponseDto;
+import com.sprint.mission.discodeit.application.dto.channel.CreateChannelRequestDto;
+import com.sprint.mission.discodeit.application.dto.channel.DeleteChannelRequestDto;
+import com.sprint.mission.discodeit.domain.channel.Channel;
+import java.util.UUID;
+
+public interface ChannelService {
+
+    ChannelResponseDto create(CreateChannelRequestDto requestDto);
+
+    Channel findOneByIdOrThrow(UUID uuid);
+
+    void changeSubject(ChangeChannelSubjectRequestDto requestDto);
+
+    void changeChannelName(ChangeChannelNameRequestDto requestDto);
+
+    void deleteChannel(DeleteChannelRequestDto requestDto);
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/MessageService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/MessageService.java
new file mode 100644
index 000000000..f68063458
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/MessageService.java
@@ -0,0 +1,19 @@
+package com.sprint.mission.discodeit.application.service.interfaces;
+
+import com.sprint.mission.discodeit.application.dto.message.CreateMessageRequestDto;
+import com.sprint.mission.discodeit.application.dto.message.DeleteMessageRequestDto;
+import com.sprint.mission.discodeit.application.dto.message.MessageResponseDto;
+import com.sprint.mission.discodeit.application.dto.message.UpdateMessageContentRequestDto;
+import com.sprint.mission.discodeit.domain.message.Message;
+import java.util.UUID;
+
+public interface MessageService {
+
+    MessageResponseDto createMessage(CreateMessageRequestDto requestDto);
+
+    void updateMessage(UpdateMessageContentRequestDto requestDto);
+
+    void deleteMessage(DeleteMessageRequestDto requestDto);
+
+    Message findOneByIdOrThrow(UUID uuid);
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/UserService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/UserService.java
new file mode 100644
index 000000000..ca3654f36
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/UserService.java
@@ -0,0 +1,20 @@
+package com.sprint.mission.discodeit.application.service.interfaces;
+
+import com.sprint.mission.discodeit.application.dto.user.ChangePasswordRequestDto;
+import com.sprint.mission.discodeit.application.dto.user.LoginRequestDto;
+import com.sprint.mission.discodeit.application.dto.user.UserResponseDto;
+import com.sprint.mission.discodeit.application.dto.user.joinUserRequestDto;
+import com.sprint.mission.discodeit.domain.user.User;
+import java.util.UUID;
+
+public interface UserService {
+
+    UserResponseDto join(joinUserRequestDto requestDto);
+
+    void login(LoginRequestDto requestDto);
+
+    User findOneByIdOrThrow(UUID userId);
+
+    void changePassword(UUID userId, ChangePasswordRequestDto requestDto);
+
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/MessageService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/JCFMessageService.java
similarity index 81%
rename from codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/MessageService.java
rename to codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/JCFMessageService.java
index 0b6d660d9..f1f2cbe43 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/MessageService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/JCFMessageService.java
@@ -4,8 +4,9 @@
 import com.sprint.mission.discodeit.application.dto.message.DeleteMessageRequestDto;
 import com.sprint.mission.discodeit.application.dto.message.MessageResponseDto;
 import com.sprint.mission.discodeit.application.dto.message.UpdateMessageContentRequestDto;
-import com.sprint.mission.discodeit.application.service.channel.ChannelService;
-import com.sprint.mission.discodeit.application.service.user.UserService;
+import com.sprint.mission.discodeit.application.service.channel.JCFChannelService;
+import com.sprint.mission.discodeit.application.service.interfaces.MessageService;
+import com.sprint.mission.discodeit.application.service.user.JCFUserService;
 import com.sprint.mission.discodeit.domain.channel.Channel;
 import com.sprint.mission.discodeit.domain.message.Message;
 import com.sprint.mission.discodeit.domain.message.exception.MessageNotFoundException;
@@ -14,22 +15,23 @@
 import com.sprint.mission.discodeit.repository.message.interfaces.MessageRepository;
 import java.util.UUID;
 
-public class MessageService {
+public class JCFMessageService implements MessageService {
 
     private final MessageRepository messageRepository;
-    private final ChannelService channelService;
-    private final UserService userService;
+    private final JCFChannelService channelService;
+    private final JCFUserService userService;
 
-    public MessageService(
+    public JCFMessageService(
             MessageRepository messageRepository,
-            ChannelService channelService,
-            UserService userService
+            JCFChannelService channelService,
+            JCFUserService userService
     ) {
         this.messageRepository = messageRepository;
         this.channelService = channelService;
         this.userService = userService;
     }
 
+    @Override
     public MessageResponseDto createMessage(CreateMessageRequestDto requestDto) {
         User sender = userService.findOneByIdOrThrow(requestDto.userId());
         Channel destinationChannel = channelService.findOneByIdOrThrow(requestDto.destinationChannelId());
@@ -37,17 +39,20 @@ public MessageResponseDto createMessage(CreateMessageRequestDto requestDto) {
         return MessageResponseDto.from(createMessage);
     }
 
+    @Override
     public void updateMessage(UpdateMessageContentRequestDto requestDto) {
         Message foundMessage = findOneByIdOrThrow(requestDto.messageId());
         foundMessage.updateContent(requestDto.content());
         messageRepository.save(foundMessage);
     }
 
+    @Override
     public void deleteMessage(DeleteMessageRequestDto requestDto) {
         Message foundMessage = findOneByIdOrThrow(requestDto.messageId());
         messageRepository.deleteById(foundMessage.getId());
     }
 
+    @Override
     public Message findOneByIdOrThrow(UUID messageId) {
         return messageRepository.findById(messageId).orElseThrow(() -> new MessageNotFoundException(ErrorCode.NOT_FOUND));
     }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/UserService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/JCFUserService.java
similarity index 91%
rename from codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/UserService.java
rename to codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/JCFUserService.java
index e4ccff57e..73ddc6646 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/UserService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/JCFUserService.java
@@ -2,9 +2,10 @@
 
 import com.sprint.mission.discodeit.application.auth.PasswordEncoder;
 import com.sprint.mission.discodeit.application.dto.user.ChangePasswordRequestDto;
-import com.sprint.mission.discodeit.application.dto.user.JoinUserReqeustDto;
 import com.sprint.mission.discodeit.application.dto.user.LoginRequestDto;
 import com.sprint.mission.discodeit.application.dto.user.UserResponseDto;
+import com.sprint.mission.discodeit.application.dto.user.joinUserRequestDto;
+import com.sprint.mission.discodeit.application.service.interfaces.UserService;
 import com.sprint.mission.discodeit.application.service.user.converter.UserConverter;
 import com.sprint.mission.discodeit.domain.user.BirthDate;
 import com.sprint.mission.discodeit.domain.user.Email;
@@ -23,13 +24,13 @@
 import org.springframework.stereotype.Service;
 
 @Service
-public class UserService {
+public class JCFUserService implements UserService {
 
     private final UserRepository userRepository;
     private final UserConverter userConverter;
     private final PasswordEncoder passwordEncoder;
 
-    public UserService(
+    public JCFUserService(
             UserRepository userRepository,
             UserConverter userConverter,
             PasswordEncoder passwordEncoder
@@ -39,7 +40,8 @@ public UserService(
         this.passwordEncoder = passwordEncoder;
     }
 
-    public UserResponseDto join(JoinUserReqeustDto requestDto) {
+    @Override
+    public UserResponseDto join(joinUserRequestDto requestDto) {
         throwEmailAlreadyUsed(requestDto.email());
         throwUsernameAlreadyUsed(requestDto.username());
         PasswordValidator.validateOrThrow(requestDto.password());
@@ -47,6 +49,7 @@ public UserResponseDto join(JoinUserReqeustDto requestDto) {
         return userConverter.toDto(savedUser);
     }
 
+    @Override
     public void login(LoginRequestDto requestDto) {
         userRepository.findOneByEmail(new Email(requestDto.email()))
                 .filter(user -> matchUserPassword(requestDto.password(), user.getPasswordValue()))
@@ -55,11 +58,13 @@ public void login(LoginRequestDto requestDto) {
         // etc. 스프링 시큐리티 적용 시 리팩터링 최대한 변경에 유연하게 코딩
     }
 
+    @Override
     public User findOneByIdOrThrow(UUID uuid) {
         return userRepository.findOneById(uuid)
                 .orElseThrow(() -> new UserNotFoundException(ErrorCode.NOT_FOUND));
     }
 
+    @Override
     public void changePassword(UUID userId, ChangePasswordRequestDto requestDto) {
         PasswordValidator.validateOrThrow(requestDto.password());
         User foundUser = findOneByIdOrThrow(userId);
@@ -83,7 +88,7 @@ private boolean matchUserPassword(String rawPassword, String encodedPassword) {
         return passwordEncoder.matches(rawPassword, encodedPassword);
     }
 
-    private User toUserWithPasswordEncode(JoinUserReqeustDto requestDto) {
+    private User toUserWithPasswordEncode(joinUserRequestDto requestDto) {
         return User.builder()
                 .username(new Username(requestDto.username()))
                 .nickname(new Nickname(requestDto.nickname()))
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/converter/UserConverter.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/converter/UserConverter.java
index c204e5fa0..fc0c7f045 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/converter/UserConverter.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/converter/UserConverter.java
@@ -1,6 +1,6 @@
 package com.sprint.mission.discodeit.application.service.user.converter;
 
-import com.sprint.mission.discodeit.application.dto.user.JoinUserReqeustDto;
+import com.sprint.mission.discodeit.application.dto.user.joinUserRequestDto;
 import com.sprint.mission.discodeit.application.dto.user.UserResponseDto;
 import com.sprint.mission.discodeit.domain.user.BirthDate;
 import com.sprint.mission.discodeit.domain.user.Email;
@@ -14,7 +14,7 @@
 @Component
 public class UserConverter {
 
-    public User toUser(JoinUserReqeustDto requestDto) {
+    public User toUser(joinUserRequestDto requestDto) {
         return User.builder()
             .username(new Username(requestDto.username()))
             .nickname(new Nickname(requestDto.nickname()))
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java
index a209e9e28..7fbc842eb 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java
@@ -34,7 +34,8 @@ public Channel(
 
     public void updateSubject(String subject) {
         if (subject.length() > SUBJECT_MAX_LENGTH) {
-            throw new ChannelSubjectOverLengthException(ErrorCode.INVALID_SUBJECT_LENGTH, "입력 글자 수:".concat(String.valueOf(subject.length())));
+            throw new ChannelSubjectOverLengthException(ErrorCode.INVALID_SUBJECT_LENGTH,
+                    "입력 글자 수:".concat(String.valueOf(subject.length())));
         }
         this.subject = subject;
     }
@@ -52,4 +53,16 @@ private void validate(String name) {
     public UUID getId() {
         return id;
     }
+
+    public String getName() {
+        return name;
+    }
+
+    public String getSubject() {
+        return subject;
+    }
+
+    public String getType() {
+        return type.toString();
+    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/application/service/UserServiceTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/application/service/UserServiceTest.java
index 94f698f1d..3506b642b 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/application/service/UserServiceTest.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/application/service/UserServiceTest.java
@@ -1,7 +1,7 @@
 package com.sprint.mission.discodeit.application.service;
 
-import com.sprint.mission.discodeit.application.dto.user.JoinUserReqeustDto;
-import com.sprint.mission.discodeit.application.service.user.UserService;
+import com.sprint.mission.discodeit.application.dto.user.joinUserRequestDto;
+import com.sprint.mission.discodeit.application.service.user.JCFUserService;
 import com.sprint.mission.discodeit.domain.user.exception.AlreadyUserExistsException;
 import com.sprint.mission.discodeit.fake.FakeFactory;
 import com.sprint.mission.discodeit.fake.domain.user.StubUser;
@@ -11,8 +11,8 @@
 
 class UserServiceTest {
 
-    private UserService userService;
-    private JoinUserReqeustDto joinUserReqeustDto = StubUser.generateJoinRequestDto();
+    private JCFUserService userService;
+    private joinUserRequestDto joinUserReqeustDto = StubUser.generateJoinRequestDto();
 
     @BeforeEach
     void setup() {
@@ -23,7 +23,7 @@ void setup() {
     void 회원가입_요청_메소드_호출_이미_존재하는_이메일_이면_에러throw() {
         // given
         userService.join(joinUserReqeustDto);
-        JoinUserReqeustDto anotherUsernameRequest = StubUser.generateJoinRequestByUsername("anotherusername");
+        joinUserRequestDto anotherUsernameRequest = StubUser.generateJoinRequestByUsername("anotherusername");
 
         // when
         Throwable catchThrow = Assertions.catchThrowable(
@@ -36,7 +36,7 @@ void setup() {
     void 회원가입_요청_이미_존재하는_유저이름_요청_에러throw() {
         // given
         userService.join(joinUserReqeustDto);
-        JoinUserReqeustDto anotherEmailRequest = StubUser.generateJoinRequestByEmail("another@test.com");
+        joinUserRequestDto anotherEmailRequest = StubUser.generateJoinRequestByEmail("another@test.com");
 
         // when
         Throwable catchThrow = Assertions.catchThrowable(
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/FakeFactory.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/FakeFactory.java
index 0a3f22b6f..d3da490c5 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/FakeFactory.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/FakeFactory.java
@@ -1,7 +1,7 @@
 package com.sprint.mission.discodeit.fake;
 
 import com.sprint.mission.discodeit.application.auth.PasswordEncoder;
-import com.sprint.mission.discodeit.application.service.user.UserService;
+import com.sprint.mission.discodeit.application.service.user.JCFUserService;
 import com.sprint.mission.discodeit.application.service.user.converter.UserConverter;
 import com.sprint.mission.discodeit.fake.repository.FakeUserRepository;
 import com.sprint.mission.discodeit.repository.user.interfaces.UserRepository;
@@ -14,7 +14,7 @@ public static UserRepository getUserRepository() {
         return new FakeUserRepository();
     }
 
-    public static UserService getUserService() {
-        return new UserService(getUserRepository(), new UserConverter(), new PasswordEncoder());
+    public static JCFUserService getUserService() {
+        return new JCFUserService(getUserRepository(), new UserConverter(), new PasswordEncoder());
     }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/domain/user/StubUser.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/domain/user/StubUser.java
index 1daa6d6be..5e5614782 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/domain/user/StubUser.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/domain/user/StubUser.java
@@ -1,6 +1,6 @@
 package com.sprint.mission.discodeit.fake.domain.user;
 
-import com.sprint.mission.discodeit.application.dto.user.JoinUserReqeustDto;
+import com.sprint.mission.discodeit.application.dto.user.joinUserRequestDto;
 import com.sprint.mission.discodeit.domain.user.BirthDate;
 import com.sprint.mission.discodeit.domain.user.Email;
 import com.sprint.mission.discodeit.domain.user.Nickname;
@@ -29,15 +29,15 @@ public static User generateUser() {
             .build();
     }
 
-    public static JoinUserReqeustDto generateJoinRequestDto() {
-        return new JoinUserReqeustDto(NICK_NAME, USER_NAME, EMAIL, PASSWORD, BIRTH_DATE);
+    public static joinUserRequestDto generateJoinRequestDto() {
+        return new joinUserRequestDto(NICK_NAME, USER_NAME, EMAIL, PASSWORD, BIRTH_DATE);
     }
 
-    public static JoinUserReqeustDto generateJoinRequestByUsername(String username) {
-        return new JoinUserReqeustDto(NICK_NAME, username, EMAIL, PASSWORD, BIRTH_DATE);
+    public static joinUserRequestDto generateJoinRequestByUsername(String username) {
+        return new joinUserRequestDto(NICK_NAME, username, EMAIL, PASSWORD, BIRTH_DATE);
     }
 
-    public static JoinUserReqeustDto generateJoinRequestByEmail(String email) {
-        return new JoinUserReqeustDto(NICK_NAME, USER_NAME, email, PASSWORD, BIRTH_DATE);
+    public static joinUserRequestDto generateJoinRequestByEmail(String email) {
+        return new joinUserRequestDto(NICK_NAME, USER_NAME, email, PASSWORD, BIRTH_DATE);
     }
 }

From 485c7fbc892c30708b51773bdbc48091284461a2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?=
 <157946706+jaewoo9797@users.noreply.github.com>
Date: Mon, 10 Feb 2025 12:23:11 +0900
Subject: [PATCH 20/38] =?UTF-8?q?feat:=20=ED=8C=A9=ED=86=A0=EB=A6=AC=20?=
 =?UTF-8?q?=ED=8C=A8=ED=84=B4=EC=9D=84=20=EC=9D=B4=EC=9A=A9=ED=95=98?=
 =?UTF-8?q?=EC=97=AC=20=EC=9D=98=EC=A1=B4=EC=84=B1=EC=9D=84=20=EA=B4=80?=
 =?UTF-8?q?=EB=A6=AC?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../mission/discodeit/JavaApplication.java    | 17 +++++++++
 .../service/message/JCFMessageService.java    | 15 ++++----
 .../discodeit/config/ChannelFactory.java      | 33 +++++++++++++++++
 .../discodeit/config/MessageFactory.java      | 33 +++++++++++++++++
 .../mission/discodeit/config/UserFactory.java | 35 +++++++++++++++++++
 .../src/main/resources/application.yaml       |  1 -
 6 files changed, 126 insertions(+), 8 deletions(-)
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/JavaApplication.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/ChannelFactory.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/MessageFactory.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/UserFactory.java

diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/JavaApplication.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/JavaApplication.java
new file mode 100644
index 000000000..31ed5e30b
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/JavaApplication.java
@@ -0,0 +1,17 @@
+package com.sprint.mission.discodeit;
+
+import com.sprint.mission.discodeit.application.service.interfaces.ChannelService;
+import com.sprint.mission.discodeit.application.service.interfaces.MessageService;
+import com.sprint.mission.discodeit.application.service.interfaces.UserService;
+import com.sprint.mission.discodeit.config.ChannelFactory;
+import com.sprint.mission.discodeit.config.MessageFactory;
+import com.sprint.mission.discodeit.config.UserFactory;
+
+public class JavaApplication {
+
+    public static void main(String[] args) {
+        UserService userService = UserFactory.getUserService();
+        ChannelService channelService = ChannelFactory.getChannelService();
+        MessageService messageService = MessageFactory.getMessageService();
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/JCFMessageService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/JCFMessageService.java
index f1f2cbe43..c67206298 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/JCFMessageService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/JCFMessageService.java
@@ -4,9 +4,9 @@
 import com.sprint.mission.discodeit.application.dto.message.DeleteMessageRequestDto;
 import com.sprint.mission.discodeit.application.dto.message.MessageResponseDto;
 import com.sprint.mission.discodeit.application.dto.message.UpdateMessageContentRequestDto;
-import com.sprint.mission.discodeit.application.service.channel.JCFChannelService;
+import com.sprint.mission.discodeit.application.service.interfaces.ChannelService;
 import com.sprint.mission.discodeit.application.service.interfaces.MessageService;
-import com.sprint.mission.discodeit.application.service.user.JCFUserService;
+import com.sprint.mission.discodeit.application.service.interfaces.UserService;
 import com.sprint.mission.discodeit.domain.channel.Channel;
 import com.sprint.mission.discodeit.domain.message.Message;
 import com.sprint.mission.discodeit.domain.message.exception.MessageNotFoundException;
@@ -18,13 +18,13 @@
 public class JCFMessageService implements MessageService {
 
     private final MessageRepository messageRepository;
-    private final JCFChannelService channelService;
-    private final JCFUserService userService;
+    private final ChannelService channelService;
+    private final UserService userService;
 
     public JCFMessageService(
             MessageRepository messageRepository,
-            JCFChannelService channelService,
-            JCFUserService userService
+            ChannelService channelService,
+            UserService userService
     ) {
         this.messageRepository = messageRepository;
         this.channelService = channelService;
@@ -54,6 +54,7 @@ public void deleteMessage(DeleteMessageRequestDto requestDto) {
 
     @Override
     public Message findOneByIdOrThrow(UUID messageId) {
-        return messageRepository.findById(messageId).orElseThrow(() -> new MessageNotFoundException(ErrorCode.NOT_FOUND));
+        return messageRepository.findById(messageId)
+                .orElseThrow(() -> new MessageNotFoundException(ErrorCode.NOT_FOUND));
     }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/ChannelFactory.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/ChannelFactory.java
new file mode 100644
index 000000000..574e3b5ad
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/ChannelFactory.java
@@ -0,0 +1,33 @@
+package com.sprint.mission.discodeit.config;
+
+import com.sprint.mission.discodeit.application.service.channel.JCFChannelService;
+import com.sprint.mission.discodeit.application.service.interfaces.ChannelService;
+import com.sprint.mission.discodeit.repository.channel.InMemoryChannelRepository;
+import com.sprint.mission.discodeit.repository.channel.interfaces.ChannelRepository;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.util.Properties;
+
+public class ChannelFactory {
+
+    private static final ChannelRepository CHANNEL_REPOSITORY = createChannelRepository();
+    private static final ChannelService CHANNEL_SERVICE = new JCFChannelService(CHANNEL_REPOSITORY);
+
+    public static ChannelService getChannelService() {
+        return CHANNEL_SERVICE;
+    }
+
+    public static ChannelRepository createChannelRepository() {
+        Properties props = new Properties();
+        try {
+            props.load(new FileInputStream("application.yaml"));
+        } catch (IOException exception) {
+            System.out.println("설정 파일 로드 실패, 기본값(memory) 사용");
+        }
+        String repositoryType = props.getProperty("repository.type", "memory");
+
+        return switch (repositoryType) {
+            default -> new InMemoryChannelRepository();
+        };
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/MessageFactory.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/MessageFactory.java
new file mode 100644
index 000000000..0cd710730
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/MessageFactory.java
@@ -0,0 +1,33 @@
+package com.sprint.mission.discodeit.config;
+
+import com.sprint.mission.discodeit.application.service.interfaces.MessageService;
+import com.sprint.mission.discodeit.application.service.message.JCFMessageService;
+import com.sprint.mission.discodeit.repository.message.interfaces.MessageRepository;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.util.Properties;
+
+public class MessageFactory {
+
+    private static final MessageRepository MESSAGE_REPOSITORY = createMessageRepository();
+    private static final MessageService MESSAGE_SERVICE = new JCFMessageService(MESSAGE_REPOSITORY,
+            ChannelFactory.getChannelService(), UserFactory.getUserService());
+
+    public static MessageService getMessageService() {
+        return MESSAGE_SERVICE;
+    }
+
+    public static MessageRepository createMessageRepository() {
+        Properties properties = new Properties();
+        try {
+            properties.load(new FileInputStream("application.yml"));
+        } catch (IOException e) {
+            System.out.println("설정 파일 로드 실패, 기본값(memory) 사용");
+        }
+        String repositoryType = properties.getProperty("repository.type", "memory");
+
+        return switch (repositoryType) {
+            default -> MESSAGE_REPOSITORY;
+        };
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/UserFactory.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/UserFactory.java
new file mode 100644
index 000000000..e2f8c45e4
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/UserFactory.java
@@ -0,0 +1,35 @@
+package com.sprint.mission.discodeit.config;
+
+import com.sprint.mission.discodeit.application.auth.PasswordEncoder;
+import com.sprint.mission.discodeit.application.service.interfaces.UserService;
+import com.sprint.mission.discodeit.application.service.user.JCFUserService;
+import com.sprint.mission.discodeit.application.service.user.converter.UserConverter;
+import com.sprint.mission.discodeit.repository.user.InMemoryUserRepository;
+import com.sprint.mission.discodeit.repository.user.interfaces.UserRepository;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.util.Properties;
+
+public class UserFactory {
+
+    private static final UserRepository USER_REPOSITORY = createUserRepository();
+    private static final UserService USER_SERVICE = new JCFUserService(USER_REPOSITORY, new UserConverter(), new PasswordEncoder());
+
+    public static UserService getUserService() {
+        return USER_SERVICE;
+    }
+
+    public static UserRepository createUserRepository() {
+        Properties props = new Properties();
+        try {
+            props.load(new FileInputStream("application.yaml"));
+        } catch (IOException exception) {
+            System.out.println("설정 파일 로드 실패, 기본값(memory) 사용");
+        }
+        String repositoryType = props.getProperty("repository.type", "memory");
+
+        return switch(repositoryType) {
+            default -> new InMemoryUserRepository();
+        };
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/resources/application.yaml b/codeit-bootcamp-spring/1-sprint-mission/src/main/resources/application.yaml
index 545cf9f09..e69de29bb 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/resources/application.yaml
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/resources/application.yaml
@@ -1 +0,0 @@
-spring.application.name=discodeit

From 74be0d4d4a2164b1bd61e4726683bbffbeb6087d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?=
 <157946706+jaewoo9797@users.noreply.github.com>
Date: Mon, 10 Feb 2025 12:31:22 +0900
Subject: [PATCH 21/38] refactor: yaml -> properties

---
 .../sprint/mission/discodeit/config/ChannelFactory.java  | 9 +++++----
 .../sprint/mission/discodeit/config/MessageFactory.java  | 9 +++++----
 .../com/sprint/mission/discodeit/config/UserFactory.java | 9 +++++----
 .../src/main/resources/application.properties            | 1 +
 .../1-sprint-mission/src/main/resources/application.yaml | 0
 5 files changed, 16 insertions(+), 12 deletions(-)
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/resources/application.properties
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/resources/application.yaml

diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/ChannelFactory.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/ChannelFactory.java
index 574e3b5ad..7efac8859 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/ChannelFactory.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/ChannelFactory.java
@@ -6,6 +6,7 @@
 import com.sprint.mission.discodeit.repository.channel.interfaces.ChannelRepository;
 import java.io.FileInputStream;
 import java.io.IOException;
+import java.io.InputStream;
 import java.util.Properties;
 
 public class ChannelFactory {
@@ -18,13 +19,13 @@ public static ChannelService getChannelService() {
     }
 
     public static ChannelRepository createChannelRepository() {
-        Properties props = new Properties();
-        try {
-            props.load(new FileInputStream("application.yaml"));
+        Properties properties = new Properties();
+        try (InputStream is = ChannelFactory.class.getClassLoader().getResourceAsStream("application.properties")) {
+            properties.load(is);
         } catch (IOException exception) {
             System.out.println("설정 파일 로드 실패, 기본값(memory) 사용");
         }
-        String repositoryType = props.getProperty("repository.type", "memory");
+        String repositoryType = properties.getProperty("repository.type", "memory");
 
         return switch (repositoryType) {
             default -> new InMemoryChannelRepository();
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/MessageFactory.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/MessageFactory.java
index 0cd710730..6c895346e 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/MessageFactory.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/MessageFactory.java
@@ -5,13 +5,14 @@
 import com.sprint.mission.discodeit.repository.message.interfaces.MessageRepository;
 import java.io.FileInputStream;
 import java.io.IOException;
+import java.io.InputStream;
 import java.util.Properties;
 
 public class MessageFactory {
 
     private static final MessageRepository MESSAGE_REPOSITORY = createMessageRepository();
-    private static final MessageService MESSAGE_SERVICE = new JCFMessageService(MESSAGE_REPOSITORY,
-            ChannelFactory.getChannelService(), UserFactory.getUserService());
+    private static final MessageService MESSAGE_SERVICE =
+            new JCFMessageService(MESSAGE_REPOSITORY, ChannelFactory.getChannelService(), UserFactory.getUserService());
 
     public static MessageService getMessageService() {
         return MESSAGE_SERVICE;
@@ -19,8 +20,8 @@ public static MessageService getMessageService() {
 
     public static MessageRepository createMessageRepository() {
         Properties properties = new Properties();
-        try {
-            properties.load(new FileInputStream("application.yml"));
+        try (InputStream is = ChannelFactory.class.getClassLoader().getResourceAsStream("application.properties")) {
+            properties.load(is);
         } catch (IOException e) {
             System.out.println("설정 파일 로드 실패, 기본값(memory) 사용");
         }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/UserFactory.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/UserFactory.java
index e2f8c45e4..88458468e 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/UserFactory.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/UserFactory.java
@@ -8,6 +8,7 @@
 import com.sprint.mission.discodeit.repository.user.interfaces.UserRepository;
 import java.io.FileInputStream;
 import java.io.IOException;
+import java.io.InputStream;
 import java.util.Properties;
 
 public class UserFactory {
@@ -20,13 +21,13 @@ public static UserService getUserService() {
     }
 
     public static UserRepository createUserRepository() {
-        Properties props = new Properties();
-        try {
-            props.load(new FileInputStream("application.yaml"));
+        Properties properties = new Properties();
+        try (InputStream is = ChannelFactory.class.getClassLoader().getResourceAsStream("application.properties")) {
+            properties.load(is);
         } catch (IOException exception) {
             System.out.println("설정 파일 로드 실패, 기본값(memory) 사용");
         }
-        String repositoryType = props.getProperty("repository.type", "memory");
+        String repositoryType = properties.getProperty("repository.type", "memory");
 
         return switch(repositoryType) {
             default -> new InMemoryUserRepository();
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/resources/application.properties b/codeit-bootcamp-spring/1-sprint-mission/src/main/resources/application.properties
new file mode 100644
index 000000000..449ef48d0
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/resources/application.properties
@@ -0,0 +1 @@
+repository.type = "memory"
\ No newline at end of file
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/resources/application.yaml b/codeit-bootcamp-spring/1-sprint-mission/src/main/resources/application.yaml
deleted file mode 100644
index e69de29bb..000000000

From 5a680772d0080f44d262c7f8adcb5cc1ba6e480c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?=
 <157946706+jaewoo9797@users.noreply.github.com>
Date: Mon, 10 Feb 2025 14:20:26 +0900
Subject: [PATCH 22/38] =?UTF-8?q?refactor:=20validator=20=EC=82=AD?=
 =?UTF-8?q?=EC=A0=9C?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../service/channel/JCFChannelService.java    | 33 +++++++++---
 .../service/interfaces/ChannelService.java    |  8 +--
 .../service/interfaces/MessageService.java    |  4 +-
 .../service/message/JCFMessageService.java    | 14 +++++-
 .../discodeit/config/ChannelFactory.java      |  2 +-
 .../discodeit/domain/channel/Channel.java     | 42 +++++++++++++---
 .../discodeit/domain/message/Message.java     | 37 +++++++++++---
 .../discodeit/domain/user/BirthDate.java      |  1 -
 .../mission/discodeit/domain/user/User.java   | 17 ++++---
 .../discodeit/domain/user/Username.java       |  1 -
 .../user/validation/BirthDateValidator.java   | 21 --------
 .../user/validation/EmailValidator.java       | 26 ----------
 .../user/validation/NicknameValidator.java    | 40 ---------------
 .../user/validation/UsernameValidator.java    | 42 ----------------
 .../channel/FileChannelRepository.java        | 23 +++++++++
 .../message/FileMessageRepository.java        | 23 +++++++++
 .../message/InMemoryMessageRepository.java    | 23 +++++++++
 .../repository/user/FileUserRepository.java   | 36 +++++++++++++
 .../discodeit/domain/user/BirthDateTest.java  |  4 ++
 .../discodeit/domain/user/EmailTest.java      | 30 +++++++++++
 .../discodeit/domain/user/NicknameTest.java   | 35 +++++++++++++
 .../discodeit/domain/user/UsernameTest.java   | 42 ++++++++++++++++
 .../validation/BirthDateValidatorTest.java    | 18 -------
 .../user/validation/EmailValidatorTest.java   | 39 ---------------
 .../validation/NicknameValidatorTest.java     | 47 -----------------
 .../validation/UsernameValidatorTest.java     | 50 -------------------
 ...0 \353\252\250\353\215\270\353\247\201.md" | 26 ++++++++--
 27 files changed, 362 insertions(+), 322 deletions(-)
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/BirthDateValidator.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/EmailValidator.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/NicknameValidator.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/UsernameValidator.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/FileChannelRepository.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/FileMessageRepository.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/InMemoryMessageRepository.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/FileUserRepository.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/BirthDateTest.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/BirthDateValidatorTest.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/EmailValidatorTest.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/NicknameValidatorTest.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/UsernameValidatorTest.java

diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java
index b1a7d1e02..7e4c20340 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java
@@ -6,9 +6,11 @@
 import com.sprint.mission.discodeit.application.dto.channel.CreateChannelRequestDto;
 import com.sprint.mission.discodeit.application.dto.channel.DeleteChannelRequestDto;
 import com.sprint.mission.discodeit.application.service.interfaces.ChannelService;
+import com.sprint.mission.discodeit.application.service.interfaces.UserService;
 import com.sprint.mission.discodeit.domain.channel.Channel;
 import com.sprint.mission.discodeit.domain.channel.enums.ChannelType;
 import com.sprint.mission.discodeit.domain.channel.exception.ChannelNotFoundException;
+import com.sprint.mission.discodeit.domain.user.User;
 import com.sprint.mission.discodeit.global.error.ErrorCode;
 import com.sprint.mission.discodeit.repository.channel.interfaces.ChannelRepository;
 import java.util.UUID;
@@ -16,17 +18,22 @@
 public class JCFChannelService implements ChannelService {
 
     private final ChannelRepository channelRepository;
+    private final UserService userService;
 
     public JCFChannelService(
-            ChannelRepository channelRepository
+            ChannelRepository channelRepository,
+            UserService userService
     ) {
         this.channelRepository = channelRepository;
+        this.userService = userService;
     }
 
     @Override
-    public ChannelResponseDto create(CreateChannelRequestDto requestDto) {
-        ChannelType channelType = ChannelType.valueOf(requestDto.channelType());    // TODO 예외 발생할 수 있음 -> 이넘타입에 존재하지 않을 경우
-        Channel createChannel = new Channel(requestDto.name(), channelType);
+    public ChannelResponseDto create(UUID userId, CreateChannelRequestDto requestDto) {
+        User foundUser = userService.findOneByIdOrThrow(userId);
+        // TODO 예외 발생할 수 있음 -> 이넘타입에 존재하지 않을 경우
+        ChannelType channelType = ChannelType.valueOf(requestDto.channelType());
+        Channel createChannel = new Channel(requestDto.name(), channelType, foundUser);
         Channel savedChannel = channelRepository.save(createChannel);
         return ChannelResponseDto.from(savedChannel);
     }
@@ -38,22 +45,34 @@ public Channel findOneByIdOrThrow(UUID id) {
     }
 
     @Override
-    public void changeSubject(ChangeChannelSubjectRequestDto requestDto) {
+    public void changeSubject(UUID userId, ChangeChannelSubjectRequestDto requestDto) {
+        User foundUser = userService.findOneByIdOrThrow(userId);
         Channel foundChannel = findOneByIdOrThrow(requestDto.channelId());
+        throwIsNotManager(foundUser, foundChannel);
         foundChannel.updateSubject(requestDto.subject());
         channelRepository.save(foundChannel);
     }
 
     @Override
-    public void changeChannelName(ChangeChannelNameRequestDto requestDto) {
+    public void changeChannelName(UUID userId, ChangeChannelNameRequestDto requestDto) {
+        User foundUser = userService.findOneByIdOrThrow(userId);
         Channel foundChannel = findOneByIdOrThrow(requestDto.channelId());
+        throwIsNotManager(foundUser, foundChannel);
         foundChannel.updateName(requestDto.channelName());
         channelRepository.save(foundChannel);
     }
 
     @Override
-    public void deleteChannel(DeleteChannelRequestDto requestDto) {
+    public void deleteChannel(UUID userId, DeleteChannelRequestDto requestDto) {
+        User foundUser = userService.findOneByIdOrThrow(userId);
         Channel foundChannel = findOneByIdOrThrow(requestDto.channelId());
+        throwIsNotManager(foundUser, foundChannel);
         channelRepository.deleteById(foundChannel.getId());
     }
+
+    private void throwIsNotManager(User foundUser, Channel foundChannel) {
+        if (!foundChannel.isManager(foundUser)) {
+            throw new IllegalArgumentException();
+        }
+    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/ChannelService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/ChannelService.java
index 2f09e5671..3d94a2a1a 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/ChannelService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/ChannelService.java
@@ -10,13 +10,13 @@
 
 public interface ChannelService {
 
-    ChannelResponseDto create(CreateChannelRequestDto requestDto);
+    ChannelResponseDto create(UUID userId, CreateChannelRequestDto requestDto);
 
     Channel findOneByIdOrThrow(UUID uuid);
 
-    void changeSubject(ChangeChannelSubjectRequestDto requestDto);
+    void changeSubject(UUID userId, ChangeChannelSubjectRequestDto requestDto);
 
-    void changeChannelName(ChangeChannelNameRequestDto requestDto);
+    void changeChannelName(UUID userId, ChangeChannelNameRequestDto requestDto);
 
-    void deleteChannel(DeleteChannelRequestDto requestDto);
+    void deleteChannel(UUID userId, DeleteChannelRequestDto requestDto);
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/MessageService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/MessageService.java
index f68063458..49574fa84 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/MessageService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/MessageService.java
@@ -11,9 +11,9 @@ public interface MessageService {
 
     MessageResponseDto createMessage(CreateMessageRequestDto requestDto);
 
-    void updateMessage(UpdateMessageContentRequestDto requestDto);
+    void updateMessage(UUID userId, UpdateMessageContentRequestDto requestDto);
 
-    void deleteMessage(DeleteMessageRequestDto requestDto);
+    void deleteMessage(UUID userId, DeleteMessageRequestDto requestDto);
 
     Message findOneByIdOrThrow(UUID uuid);
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/JCFMessageService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/JCFMessageService.java
index c67206298..0bd4514b9 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/JCFMessageService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/JCFMessageService.java
@@ -40,15 +40,19 @@ public MessageResponseDto createMessage(CreateMessageRequestDto requestDto) {
     }
 
     @Override
-    public void updateMessage(UpdateMessageContentRequestDto requestDto) {
+    public void updateMessage(UUID userId, UpdateMessageContentRequestDto requestDto) {
+        User foundUser = userService.findOneByIdOrThrow(userId);
         Message foundMessage = findOneByIdOrThrow(requestDto.messageId());
+        throwIsNotSender(foundUser, foundMessage);
         foundMessage.updateContent(requestDto.content());
         messageRepository.save(foundMessage);
     }
 
     @Override
-    public void deleteMessage(DeleteMessageRequestDto requestDto) {
+    public void deleteMessage(UUID userId, DeleteMessageRequestDto requestDto) {
+        User foundUser = userService.findOneByIdOrThrow(userId);
         Message foundMessage = findOneByIdOrThrow(requestDto.messageId());
+        throwIsNotSender(foundUser, foundMessage);
         messageRepository.deleteById(foundMessage.getId());
     }
 
@@ -57,4 +61,10 @@ public Message findOneByIdOrThrow(UUID messageId) {
         return messageRepository.findById(messageId)
                 .orElseThrow(() -> new MessageNotFoundException(ErrorCode.NOT_FOUND));
     }
+
+    private void throwIsNotSender(User foundUser, Message foundMessage) {
+        if (!foundMessage.isSender(foundUser)) {
+            throw new IllegalArgumentException();
+        }
+    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/ChannelFactory.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/ChannelFactory.java
index 7efac8859..b7df9f9ab 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/ChannelFactory.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/ChannelFactory.java
@@ -12,7 +12,7 @@
 public class ChannelFactory {
 
     private static final ChannelRepository CHANNEL_REPOSITORY = createChannelRepository();
-    private static final ChannelService CHANNEL_SERVICE = new JCFChannelService(CHANNEL_REPOSITORY);
+    private static final ChannelService CHANNEL_SERVICE = new JCFChannelService(CHANNEL_REPOSITORY, UserFactory.getUserService());
 
     public static ChannelService getChannelService() {
         return CHANNEL_SERVICE;
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java
index 7fbc842eb..90595fa62 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java
@@ -3,33 +3,42 @@
 import com.sprint.mission.discodeit.domain.channel.enums.ChannelType;
 import com.sprint.mission.discodeit.domain.channel.exception.ChannelNameInvalidException;
 import com.sprint.mission.discodeit.domain.channel.exception.ChannelSubjectOverLengthException;
+import com.sprint.mission.discodeit.domain.user.User;
 import com.sprint.mission.discodeit.global.error.ErrorCode;
+import java.io.Serial;
+import java.io.Serializable;
+import java.time.Instant;
 import java.time.LocalDateTime;
 import java.util.Objects;
 import java.util.UUID;
 
-public class Channel {
+public class Channel implements Serializable {
 
+    @Serial
+    private static final long serialVersionUID = 6800939087441796647L;
     private final static int SUBJECT_MAX_LENGTH = 1024;
 
     private final UUID id;
     private String name;
     private String subject;
     private ChannelType type;
-    private final LocalDateTime createdAt;
-    private LocalDateTime updatedAt;
+    private final Instant createdAt;
+    private Instant updatedAt;
+    private final User manager;
 
     public Channel(
             String name,
-            ChannelType type
+            ChannelType type,
+            User manager
     ) {
         validate(name);
         this.id = UUID.randomUUID();
         this.name = name;
         this.subject = "";
         this.type = type;
-        createdAt = LocalDateTime.now();
-        updatedAt = LocalDateTime.now();
+        createdAt = Instant.now();
+        updatedAt = Instant.now();
+        this.manager = manager;
     }
 
     public void updateSubject(String subject) {
@@ -50,6 +59,10 @@ private void validate(String name) {
         }
     }
 
+    public boolean isManager(User user) {
+        return this.manager.equals(user);
+    }
+
     public UUID getId() {
         return id;
     }
@@ -65,4 +78,21 @@ public String getSubject() {
     public String getType() {
         return type.toString();
     }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        Channel channel = (Channel) o;
+        return Objects.equals(id, channel.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(id);
+    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/message/Message.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/message/Message.java
index d1a9550a4..a479c0f46 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/message/Message.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/message/Message.java
@@ -4,15 +4,20 @@
 import com.sprint.mission.discodeit.domain.message.exception.InvalidMessageContentException;
 import com.sprint.mission.discodeit.domain.user.User;
 import com.sprint.mission.discodeit.global.error.ErrorCode;
-import java.time.LocalDateTime;
+import java.io.Serial;
+import java.io.Serializable;
+import java.time.Instant;
 import java.util.Objects;
 import java.util.UUID;
 
-public class Message {
+public class Message implements Serializable {
+
+    @Serial
+    private static final long serialVersionUID = -5528993606626641717L;
 
     private final UUID id;
-    private final LocalDateTime createdAt;
-    private LocalDateTime updatedAt;
+    private final Instant createdAt;
+    private Instant updatedAt;
     private final User sender;
     private final Channel destinationChannel;
     private String content;
@@ -23,8 +28,12 @@ public Message(User sender, Channel destinationChannel, String content) {
         this.sender = sender;
         this.destinationChannel = destinationChannel;
         this.content = content;
-        this.createdAt = LocalDateTime.now();
-        this.updatedAt = LocalDateTime.now();
+        this.createdAt = Instant.now();
+        this.updatedAt = Instant.now();
+    }
+
+    public boolean isSender(User user) {
+        return sender.equals(user);
     }
 
     public void updateContent(String content) {
@@ -54,4 +63,20 @@ public UUID getDestinationChannelId() {
         return destinationChannel.getId();
     }
 
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        Message message = (Message) o;
+        return Objects.equals(id, message.id);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(id);
+    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/BirthDate.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/BirthDate.java
index 56283fb02..a2dc412ca 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/BirthDate.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/BirthDate.java
@@ -1,7 +1,6 @@
 package com.sprint.mission.discodeit.domain.user;
 
 import com.sprint.mission.discodeit.domain.user.exception.BirthDateInvalidException;
-import com.sprint.mission.discodeit.domain.user.validation.BirthDateValidator;
 import com.sprint.mission.discodeit.global.error.ErrorCode;
 import java.time.LocalDate;
 import java.util.Objects;
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/User.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/User.java
index 806b11930..4825d73e9 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/User.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/User.java
@@ -1,12 +1,17 @@
 package com.sprint.mission.discodeit.domain.user;
 
 import com.sprint.mission.discodeit.domain.user.enums.EmailSubscriptionStatus;
-import java.time.LocalDateTime;
+import java.io.Serial;
+import java.io.Serializable;
+import java.time.Instant;
 import java.util.Objects;
 import java.util.UUID;
 import lombok.Builder;
 
-public class User {
+public class User implements Serializable {
+
+    @Serial
+    private static final long serialVersionUID = 1284229838745272170L;
 
     private final UUID id;
     private final Nickname nickname;
@@ -14,8 +19,8 @@ public class User {
     private final Email email;
     private final Password password;
     private final BirthDate birthDate;
-    private final LocalDateTime createdAt;
-    private final LocalDateTime updatedAt;
+    private final Instant createdAt;
+    private final Instant updatedAt;
     private final EmailSubscriptionStatus emailSubscriptionStatus;
 
     @Builder
@@ -28,8 +33,8 @@ public User(
             EmailSubscriptionStatus emailSubscriptionStatus
     ) {
         this.id = UUID.randomUUID();
-        this.createdAt = LocalDateTime.now();
-        this.updatedAt = LocalDateTime.now();
+        this.createdAt = Instant.now();
+        this.updatedAt = Instant.now();
         this.nickname = nickname;
         this.username = username;
         this.email = email;
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Username.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Username.java
index d6dab6860..8bebe8eef 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Username.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Username.java
@@ -1,7 +1,6 @@
 package com.sprint.mission.discodeit.domain.user;
 
 import com.sprint.mission.discodeit.domain.user.exception.UserNameInvalidException;
-import com.sprint.mission.discodeit.domain.user.validation.UsernameValidator;
 import com.sprint.mission.discodeit.global.error.ErrorCode;
 import java.util.Objects;
 import java.util.Set;
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/BirthDateValidator.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/BirthDateValidator.java
deleted file mode 100644
index cf8469d30..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/BirthDateValidator.java
+++ /dev/null
@@ -1,21 +0,0 @@
-package com.sprint.mission.discodeit.domain.user.validation;
-
-import com.sprint.mission.discodeit.domain.user.exception.BirthDateInvalidException;
-import com.sprint.mission.discodeit.global.error.ErrorCode;
-import java.time.LocalDate;
-import java.util.Objects;
-
-public class BirthDateValidator {
-    private static final int MIN_AGE_RESTRICT = 13;
-
-    public static void validate(LocalDate birthDate) {
-        if (Objects.isNull(birthDate)) {
-            throw new BirthDateInvalidException(ErrorCode.BIRTHDATE_REQUIRED, "");
-        }
-
-        LocalDate minimumAllowedYear = LocalDate.now().minusYears(MIN_AGE_RESTRICT);
-        if (!birthDate.isBefore(minimumAllowedYear)) {
-            throw new BirthDateInvalidException(ErrorCode.UNDERAGE_SIGNUP_REGISTERED, birthDate.toString());
-        }
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/EmailValidator.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/EmailValidator.java
deleted file mode 100644
index 53844f0e6..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/EmailValidator.java
+++ /dev/null
@@ -1,26 +0,0 @@
-package com.sprint.mission.discodeit.domain.user.validation;
-
-import com.sprint.mission.discodeit.domain.user.exception.EmailInvalidException;
-import com.sprint.mission.discodeit.global.error.ErrorCode;
-import java.util.Objects;
-import java.util.regex.Pattern;
-
-public class EmailValidator {
-
-    private final static String EMAIL_REGEX =
-            "^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9-]+(?:\\.[a-zA-Z]{2,7})+$";
-
-    private final static Pattern EMAIL_PATTERN = Pattern.compile(EMAIL_REGEX);
-
-
-    public static void valid(String email) {
-        if (Objects.isNull(email) || email.isBlank()) {
-            throw new EmailInvalidException(ErrorCode.EMAIL_REQUIRED, "");
-        }
-
-        if (!EMAIL_PATTERN.matcher(email).matches()) {
-            throw new EmailInvalidException(ErrorCode.INVALID_EMAIL_FORMAT, email);
-        }
-
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/NicknameValidator.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/NicknameValidator.java
deleted file mode 100644
index bdc8b656d..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/NicknameValidator.java
+++ /dev/null
@@ -1,40 +0,0 @@
-package com.sprint.mission.discodeit.domain.user.validation;
-
-import com.sprint.mission.discodeit.domain.user.exception.NickNameInvalidException;
-import com.sprint.mission.discodeit.global.error.ErrorCode;
-import java.util.Objects;
-import java.util.Set;
-import java.util.regex.Pattern;
-
-public class NicknameValidator {
-    private static final int MAX_LENGTH = 32;
-    private static final Set<String> FORBIDDEN_WORDS = Set.of(
-            "admin", "moderator", "discord", "system", "root", "bot", "mod",
-            "운영자", "관리자", "봇"
-    );
-
-    private static final String VALID_NICK_NAME_REGEX =
-            "^(?!.*\\s)[\\p{L}\\p{N}\\p{P}\\p{S}\\p{So}]{1,32}$";
-    private static final Pattern VALID_NICK_NAME_PATTERN = Pattern.compile(VALID_NICK_NAME_REGEX);
-
-    public static void validate(String value) {
-        if (Objects.isNull(value) || value.isBlank()) {
-            throw new NickNameInvalidException(ErrorCode.NICKNAME_REQUIRED, "");
-        }
-
-        if (value.length() > MAX_LENGTH) {
-            throw new NickNameInvalidException(ErrorCode.INVALID_NICKNAME_LENGTH, value);
-        }
-
-        if (!VALID_NICK_NAME_PATTERN.matcher(value).matches()) {
-            throw new NickNameInvalidException(ErrorCode.INVALID_NICKNAME_FORMAT, value);
-        }
-
-        String lowerCase = value.toLowerCase();
-        for (String word : FORBIDDEN_WORDS) {
-            if (lowerCase.contains(word)) {
-                throw new NickNameInvalidException(ErrorCode.INVALID_NICKNAME_FORMAT, value);
-            }
-        }
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/UsernameValidator.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/UsernameValidator.java
deleted file mode 100644
index 679a8b9b0..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/UsernameValidator.java
+++ /dev/null
@@ -1,42 +0,0 @@
-package com.sprint.mission.discodeit.domain.user.validation;
-
-import com.sprint.mission.discodeit.domain.user.exception.UserNameInvalidException;
-import com.sprint.mission.discodeit.global.error.ErrorCode;
-import java.util.Objects;
-import java.util.Set;
-import java.util.regex.Pattern;
-
-public class UsernameValidator {
-    private static final int MIN_LENGTH = 2;
-    private static final int MAX_LENGTH = 32;
-    private static final String VALID_USER_NAME_REGEX =
-            "^(?!.*\\.\\.)(?![.])(?!.*[.]$)[a-zA-Z0-9_.]{2,32}$";
-    private static final Pattern VALID_USER_NAME_PATTERN = Pattern.compile(VALID_USER_NAME_REGEX);
-    private static final Set<String> FORBIDDEN_WORD =
-            Set.of(
-                    "admin", "moderator", "discord", "system", "root", "bot", "mod",
-                    "운영자", "관리자", "봇"
-            );
-
-
-    public static void validate(final String username) {
-        if (Objects.isNull(username) || username.isBlank()) {
-            throw new UserNameInvalidException(ErrorCode.USERNAME_REQUIRED, "");
-        }
-
-        if (username.length() > MAX_LENGTH || username.length() < MIN_LENGTH) {
-            throw new UserNameInvalidException(ErrorCode.INVALID_USERNAME_LENGTH, username);
-        }
-
-        if (!VALID_USER_NAME_PATTERN.matcher(username).matches()) {
-            throw new UserNameInvalidException(ErrorCode.INVALID_USERNAME_FORMAT, username);
-        }
-
-        String lowerUsername = username.toLowerCase();
-        for (String word : FORBIDDEN_WORD) {
-            if (lowerUsername.contains(word)) {
-                throw new UserNameInvalidException(ErrorCode.INVALID_USERNAME_FORMAT, username);
-            }
-        }
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/FileChannelRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/FileChannelRepository.java
new file mode 100644
index 000000000..ee79d46f7
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/FileChannelRepository.java
@@ -0,0 +1,23 @@
+package com.sprint.mission.discodeit.repository.channel;
+
+import com.sprint.mission.discodeit.domain.channel.Channel;
+import com.sprint.mission.discodeit.repository.channel.interfaces.ChannelRepository;
+import java.util.Optional;
+import java.util.UUID;
+
+public class FileChannelRepository implements ChannelRepository {
+    @Override
+    public Channel save(Channel channel) {
+        return null;
+    }
+
+    @Override
+    public Optional<Channel> findOneById(UUID uuid) {
+        return Optional.empty();
+    }
+
+    @Override
+    public void deleteById(UUID uuid) {
+
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/FileMessageRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/FileMessageRepository.java
new file mode 100644
index 000000000..83a328d74
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/FileMessageRepository.java
@@ -0,0 +1,23 @@
+package com.sprint.mission.discodeit.repository.message;
+
+import com.sprint.mission.discodeit.domain.message.Message;
+import com.sprint.mission.discodeit.repository.message.interfaces.MessageRepository;
+import java.util.Optional;
+import java.util.UUID;
+
+public class FileMessageRepository implements MessageRepository {
+    @Override
+    public Message save(Message message) {
+        return null;
+    }
+
+    @Override
+    public Optional<Message> findById(UUID uuid) {
+        return Optional.empty();
+    }
+
+    @Override
+    public void deleteById(UUID uuid) {
+
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/InMemoryMessageRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/InMemoryMessageRepository.java
new file mode 100644
index 000000000..20324e84a
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/InMemoryMessageRepository.java
@@ -0,0 +1,23 @@
+package com.sprint.mission.discodeit.repository.message;
+
+import com.sprint.mission.discodeit.domain.message.Message;
+import com.sprint.mission.discodeit.repository.message.interfaces.MessageRepository;
+import java.util.Optional;
+import java.util.UUID;
+
+public class InMemoryMessageRepository implements MessageRepository {
+    @Override
+    public Message save(Message message) {
+        return null;
+    }
+
+    @Override
+    public Optional<Message> findById(UUID uuid) {
+        return Optional.empty();
+    }
+
+    @Override
+    public void deleteById(UUID uuid) {
+
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/FileUserRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/FileUserRepository.java
new file mode 100644
index 000000000..8ef29fb52
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/FileUserRepository.java
@@ -0,0 +1,36 @@
+package com.sprint.mission.discodeit.repository.user;
+
+import com.sprint.mission.discodeit.domain.user.Email;
+import com.sprint.mission.discodeit.domain.user.User;
+import com.sprint.mission.discodeit.domain.user.Username;
+import com.sprint.mission.discodeit.repository.user.interfaces.UserRepository;
+import java.util.Optional;
+import java.util.UUID;
+
+public class FileUserRepository implements UserRepository {
+
+    @Override
+    public User save(User user) {
+        return null;
+    }
+
+    @Override
+    public Optional<User> findOneById(UUID id) {
+        return Optional.empty();
+    }
+
+    @Override
+    public Optional<User> findOneByEmail(Email email) {
+        return Optional.empty();
+    }
+
+    @Override
+    public boolean isExistByEmail(Email email) {
+        return false;
+    }
+
+    @Override
+    public boolean isExistByUsername(Username username) {
+        return false;
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/BirthDateTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/BirthDateTest.java
new file mode 100644
index 000000000..953de818d
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/BirthDateTest.java
@@ -0,0 +1,4 @@
+package com.sprint.mission.discodeit.domain.user;
+
+class BirthDateTest {
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/EmailTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/EmailTest.java
index 1ef1ca6ff..352a39b5d 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/EmailTest.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/EmailTest.java
@@ -1,7 +1,11 @@
 package com.sprint.mission.discodeit.domain.user;
 
+import static org.assertj.core.api.Assertions.assertThat;
+
+import com.sprint.mission.discodeit.domain.user.exception.EmailInvalidException;
 import org.assertj.core.api.Assertions;
 import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.NullAndEmptySource;
 import org.junit.jupiter.params.provider.ValueSource;
 
 class EmailTest {
@@ -29,4 +33,30 @@ class EmailTest {
         // then
         Assertions.assertThat(createdEmail.getValue()).isEqualTo(email);
     }
+
+    @ParameterizedTest
+    @NullAndEmptySource
+    @ValueSource(strings = {
+            "abc",              // 일반 문자열
+            "abc@",             // '@'만 포함
+            "@example.com",     // 로컬 부분 없음
+            "abc@example",      // 최상위 도메인 없음
+            "abc@.com",         // 도메인 부분이 비정상적
+            "abc@com.",         // 도메인 형식 오류
+            "abc@@example.com", // '@' 중복
+            "abc example.com",  // 공백 포함
+            "abc@ex@ample.com", // 여러 개의 '@'
+            "abc@example..com", // 연속된 '.' 포함
+            "abc@example.c",    // 너무 짧은 TLD
+            "abc@example#com",  // 특수 문자 포함
+            "abc@.com",         // 도메인 앞부분 없음
+            "abc@exam_ple.com", // 언더스코어 포함 (일반적으로 허용되지 않음)
+    })
+    void 이메일_생성_Invalid값_에러throw(String email) {
+        //given
+        // when
+        Throwable throwable = Assertions.catchThrowable(() -> new Email(email));
+        // then
+        assertThat(throwable).isInstanceOf(EmailInvalidException.class);
+    }
 }
\ No newline at end of file
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/NicknameTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/NicknameTest.java
index 3dca6f1de..f984f9a29 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/NicknameTest.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/NicknameTest.java
@@ -1,8 +1,13 @@
 package com.sprint.mission.discodeit.domain.user;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.catchThrowable;
 
+import com.sprint.mission.discodeit.domain.user.exception.NickNameInvalidException;
+import java.util.stream.Stream;
 import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
+import org.junit.jupiter.params.provider.NullAndEmptySource;
 import org.junit.jupiter.params.provider.ValueSource;
 
 class NicknameTest {
@@ -33,4 +38,34 @@ class NicknameTest {
         assertThat(createNickname.getValue()).isEqualTo(nickname);
     }
 
+    @ParameterizedTest
+    @NullAndEmptySource
+    @MethodSource("nicknameOverLengthProvider")
+    @ValueSource(strings = {
+            "admin",              // 금지된 단어
+            "moderator",          // 금지된 단어
+            "discord123",         // 금지된 단어 포함
+            "superadmin",         // 금지된 단어 포함
+            "mod🚀",             // 금지된 단어 포함 + 이모지 (이모지는 가능하지만 금지어 포함이라 제한)
+            "hello admin!",       // 금지된 단어 포함
+            "AdminUser",          // 금지된 단어 포함 (대소문자 무시)
+            "DISCORD🔥",         // 금지된 단어 포함 (대소문자 무시)
+            "papago good",
+            "root_user",          // 금지된 단어 포함 (관리자 권한 관련)
+            "system_mod",         // 금지된 단어 포함
+            "운영자",              // 한글 운영자 금지
+            "테스트관리자",         // 한글 관리자 관련 단어 포함
+            "봇",                  // 봇 계정 금지
+    })
+    void 유저닉네임_제한되는_입력값_에러검증throw(String nickname) {
+        //given
+        // when
+        Throwable catchThrowable = catchThrowable(() -> new Nickname(nickname));
+        // then
+        assertThat(catchThrowable).isInstanceOf(NickNameInvalidException.class);
+    }
+
+    static Stream<String> nicknameOverLengthProvider() {
+        return Stream.of("a".repeat(33));
+    }
 }
\ No newline at end of file
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/UsernameTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/UsernameTest.java
index 90ce0115b..41bb6f080 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/UsernameTest.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/UsernameTest.java
@@ -2,7 +2,12 @@
 
 import static org.assertj.core.api.Assertions.assertThat;
 
+import com.sprint.mission.discodeit.domain.user.exception.UserNameInvalidException;
+import java.util.stream.Stream;
+import org.assertj.core.api.Assertions;
 import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
+import org.junit.jupiter.params.provider.NullAndEmptySource;
 import org.junit.jupiter.params.provider.ValueSource;
 
 class UsernameTest {
@@ -27,4 +32,41 @@ class UsernameTest {
         assertThat(createUsername.getValue()).isEqualToIgnoringCase(username);
     }
 
+    @ParameterizedTest
+    @NullAndEmptySource
+    @ValueSource(strings = {
+            "a",                      // 너무 짧음 (최소 2자)
+            "abcdefghijklmnopqrstuvwxyzabcdefghi", // 너무 김 (32자 초과, 33자)
+            "user name",              // 공백 포함 (허용되지 않음)
+            "🔥coolgamer",           // 이모지 포함 (정규식이 허용하지 않음)
+            "user!name",             // 특수문자 포함 (! 허용되지 않음)
+            "....hidden....",         // 연속된 마침표 (허용되지 않음)
+            ".username",              // 마침표로 시작 (허용되지 않음)
+            "username.",              // 마침표로 끝남 (허용되지 않음)
+            "admin",                  // 금지된 단어 포함
+            "moderator",              // 금지된 단어 포함
+            "discord123",             // 금지된 단어 포함
+            "superadmin",             // 금지된 단어 포함
+            "mod🚀",                  // 금지된 단어 포함 + 이모지
+            "hello admin!",           // 금지된 단어 포함
+            "AdminUser",              // 금지된 단어 포함 (대소문자 무시)
+            "DISCORD🔥",             // 금지된 단어 포함 (대소문자 무시)
+            "root_user",              // 금지된 단어 포함 (관리자 권한 관련)
+            "system_mod",             // 금지된 단어 포함
+            "운영자",                 // 한글 운영자 금지
+            "테스트관리자",            // 한글 관리자 관련 단어 포함
+            "봇",                     // 봇 계정 금지
+    })
+    @MethodSource("usernameOverLengthProvider")
+    void 유저_이름_제한_검증_에러throw(String username) {
+        //given
+        // when
+        Throwable catchThrowable = Assertions.catchThrowable(() -> new Username(username));
+        // then
+        Assertions.assertThat(catchThrowable).isInstanceOf(UserNameInvalidException.class);
+    }
+
+    static Stream<String> usernameOverLengthProvider() {
+        return Stream.of("a".repeat(33));
+    }
 }
\ No newline at end of file
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/BirthDateValidatorTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/BirthDateValidatorTest.java
deleted file mode 100644
index 6242d8416..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/BirthDateValidatorTest.java
+++ /dev/null
@@ -1,18 +0,0 @@
-package com.sprint.mission.discodeit.domain.user.validation;
-
-import static org.junit.jupiter.api.Assertions.*;
-
-import org.junit.jupiter.api.Test;
-
-class BirthDateValidatorTest {
-
-    @Test
-    void 나이_13세_미만_생성검증_에러throw() {
-        //given
-
-        // when
-
-        // then
-    }
-
-}
\ No newline at end of file
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/EmailValidatorTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/EmailValidatorTest.java
deleted file mode 100644
index 63d1a40ed..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/EmailValidatorTest.java
+++ /dev/null
@@ -1,39 +0,0 @@
-package com.sprint.mission.discodeit.domain.user.validation;
-
-import static org.assertj.core.api.Assertions.assertThat;
-
-import com.sprint.mission.discodeit.domain.user.exception.EmailInvalidException;
-import org.assertj.core.api.Assertions;
-import org.junit.jupiter.params.ParameterizedTest;
-import org.junit.jupiter.params.provider.NullAndEmptySource;
-import org.junit.jupiter.params.provider.ValueSource;
-
-class EmailValidatorTest {
-
-    @ParameterizedTest
-    @NullAndEmptySource
-    @ValueSource(strings = {
-            "abc",              // 일반 문자열
-            "abc@",             // '@'만 포함
-            "@example.com",     // 로컬 부분 없음
-            "abc@example",      // 최상위 도메인 없음
-            "abc@.com",         // 도메인 부분이 비정상적
-            "abc@com.",         // 도메인 형식 오류
-            "abc@@example.com", // '@' 중복
-            "abc example.com",  // 공백 포함
-            "abc@ex@ample.com", // 여러 개의 '@'
-            "abc@example..com", // 연속된 '.' 포함
-            "abc@example.c",    // 너무 짧은 TLD
-            "abc@example#com",  // 특수 문자 포함
-            "abc@.com",         // 도메인 앞부분 없음
-            "abc@exam_ple.com", // 언더스코어 포함 (일반적으로 허용되지 않음)
-    })
-    void 이메일_생성_Invalid값_에러throw(String email) {
-        //given
-        // when
-        Throwable throwable = Assertions.catchThrowable(() -> EmailValidator.valid(email));
-        // then
-        assertThat(throwable).isInstanceOf(EmailInvalidException.class);
-    }
-
-}
\ No newline at end of file
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/NicknameValidatorTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/NicknameValidatorTest.java
deleted file mode 100644
index afbd5b4a6..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/NicknameValidatorTest.java
+++ /dev/null
@@ -1,47 +0,0 @@
-package com.sprint.mission.discodeit.domain.user.validation;
-
-import static org.assertj.core.api.Assertions.assertThat;
-import static org.assertj.core.api.Assertions.catchThrowable;
-import static org.junit.jupiter.api.Assertions.*;
-
-import com.sprint.mission.discodeit.domain.user.Nickname;
-import com.sprint.mission.discodeit.domain.user.exception.NickNameInvalidException;
-import java.util.stream.Stream;
-import org.junit.jupiter.params.ParameterizedTest;
-import org.junit.jupiter.params.provider.MethodSource;
-import org.junit.jupiter.params.provider.NullAndEmptySource;
-import org.junit.jupiter.params.provider.ValueSource;
-
-class NicknameValidatorTest {
-
-    @ParameterizedTest
-    @NullAndEmptySource
-    @MethodSource("nicknameOverLengthProvider")
-    @ValueSource(strings = {
-            "admin",              // 금지된 단어
-            "moderator",          // 금지된 단어
-            "discord123",         // 금지된 단어 포함
-            "superadmin",         // 금지된 단어 포함
-            "mod🚀",             // 금지된 단어 포함 + 이모지 (이모지는 가능하지만 금지어 포함이라 제한)
-            "hello admin!",       // 금지된 단어 포함
-            "AdminUser",          // 금지된 단어 포함 (대소문자 무시)
-            "DISCORD🔥",         // 금지된 단어 포함 (대소문자 무시)
-            "papago good",
-            "root_user",          // 금지된 단어 포함 (관리자 권한 관련)
-            "system_mod",         // 금지된 단어 포함
-            "운영자",              // 한글 운영자 금지
-            "테스트관리자",         // 한글 관리자 관련 단어 포함
-            "봇",                  // 봇 계정 금지
-    })
-    void 유저닉네임_제한되는_입력값_에러검증throw(String nickname) {
-        //given
-        // when
-        Throwable catchThrowable = catchThrowable(() -> new Nickname(nickname));
-        // then
-        assertThat(catchThrowable).isInstanceOf(NickNameInvalidException.class);
-    }
-
-    static Stream<String> nicknameOverLengthProvider() {
-        return Stream.of("a".repeat(33));
-    }
-}
\ No newline at end of file
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/UsernameValidatorTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/UsernameValidatorTest.java
deleted file mode 100644
index 975c06466..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/validation/UsernameValidatorTest.java
+++ /dev/null
@@ -1,50 +0,0 @@
-package com.sprint.mission.discodeit.domain.user.validation;
-
-import com.sprint.mission.discodeit.domain.user.exception.UserNameInvalidException;
-import java.util.stream.Stream;
-import org.assertj.core.api.Assertions;
-import org.junit.jupiter.params.ParameterizedTest;
-import org.junit.jupiter.params.provider.MethodSource;
-import org.junit.jupiter.params.provider.NullAndEmptySource;
-import org.junit.jupiter.params.provider.ValueSource;
-
-class UsernameValidatorTest {
-
-    @ParameterizedTest
-    @NullAndEmptySource
-    @ValueSource(strings = {
-            "a",                      // 너무 짧음 (최소 2자)
-            "abcdefghijklmnopqrstuvwxyzabcdefghi", // 너무 김 (32자 초과, 33자)
-            "user name",              // 공백 포함 (허용되지 않음)
-            "🔥coolgamer",           // 이모지 포함 (정규식이 허용하지 않음)
-            "user!name",             // 특수문자 포함 (! 허용되지 않음)
-            "....hidden....",         // 연속된 마침표 (허용되지 않음)
-            ".username",              // 마침표로 시작 (허용되지 않음)
-            "username.",              // 마침표로 끝남 (허용되지 않음)
-            "admin",                  // 금지된 단어 포함
-            "moderator",              // 금지된 단어 포함
-            "discord123",             // 금지된 단어 포함
-            "superadmin",             // 금지된 단어 포함
-            "mod🚀",                  // 금지된 단어 포함 + 이모지
-            "hello admin!",           // 금지된 단어 포함
-            "AdminUser",              // 금지된 단어 포함 (대소문자 무시)
-            "DISCORD🔥",             // 금지된 단어 포함 (대소문자 무시)
-            "root_user",              // 금지된 단어 포함 (관리자 권한 관련)
-            "system_mod",             // 금지된 단어 포함
-            "운영자",                 // 한글 운영자 금지
-            "테스트관리자",            // 한글 관리자 관련 단어 포함
-            "봇",                     // 봇 계정 금지
-    })
-    @MethodSource("usernameOverLengthProvider")
-    void 유저_이름_제한_검증_에러throw(String username) {
-        //given
-        // when
-        Throwable catchThrowable = Assertions.catchThrowable(() -> UsernameValidator.validate(username));
-        // then
-        Assertions.assertThat(catchThrowable).isInstanceOf(UserNameInvalidException.class);
-    }
-
-    static Stream<String> usernameOverLengthProvider() {
-        return Stream.of("a".repeat(33));
-    }
-}
\ No newline at end of file
diff --git "a/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md" "b/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md"
index 96928068b..492fe1211 100644
--- "a/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md"	
+++ "b/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md"	
@@ -43,14 +43,16 @@
 
 ## 채널
 - 새로운 채널 생성
-  - `채널이름`, `채널 유형`을 입력받는다.
+  - `채널이름`, `채널 유형`, `채널 생성 유저`를 입력받는다.
     - 텍스트 채널 유형
     - 음성, 영상, 화면 유형
     - 채널 주제 (생성 시에는 입력받지 않음, 1024 글자 제한)
 - 채널 삭제
+  - 채널 매니저가 아닐 경우 에러
 - 채널 정보 수정
-  - 이름 수정
-  - 채널 주제 수정 1024 글자제한
+  - 채널 매니저가 아닐 경우 에러
+    - 이름 수정
+    - 채널 주제 수정 1024 글자제한
 
 ## 메세지
 
@@ -58,6 +60,24 @@
   - `메시지 id`, `메시지 생성, 수정시간`, `메시지 내용`, `보낸사람`, `목적지 채널`
     - 메시지 내용은 비어있을 수 없다.
 - 메시지 내용 수정
+  - 발신자가 아니라면 에러
 - 메시지 삭제
+  - 발진자가 아니라면 에러
+
+
+## ReadStatus
+  - 사용자가 채널 별 마지막으로 메시지를 읽은 시간을 표현하는 도메인 모델입니다. 사용자별 각 채널에 읽지 않은 메시지를 확인하기 위해 활용합니다.
+  - `id`, `createdAt`, `updatedAt`
+
+## UserStatus
+- 사용자 별 마지막으로 확인된 접속 시간을 표현하는 도메인 모델입니다. 사용자의 온라인 상태를 확인하기 위해 활용합니다.
+- 마지막 접속 시간을 기준으로 현재 로그인한 유저로 판단할 수 있는 메소드를 정의하세요.
+  - 마지막 접속 시간이 현재 시간으로부터 5분 이내이면 현재 접속 중인 유저로 간주합니다.
+- `id`, `createdAt`, `updatedAt`
+
+## BinaryContent
+- 이미지, 파일 등 바이너리 데이터를 표현하는 도메인 모델입니다. 사용자의 프로필 이미지, 메시지에 첨부된 파일을 저장하기 위해 활용합니다.
+-  수정 불가능한 도메인 모델로 간주합니다. 따라서 updatedAt 필드는 정의하지 않습니다.
+-  User, Message 도메인 모델과의 의존 관계 방향성을 잘 고려하여 id 참조 필드를 추가하세요.
 
 -- newLine for git

From 08dd9f041ef7640c82fcc2931a644772319bfa55 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?=
 <157946706+jaewoo9797@users.noreply.github.com>
Date: Mon, 10 Feb 2025 15:37:56 +0900
Subject: [PATCH 23/38] =?UTF-8?q?feat:=20readStatus=20=EA=B8=B0=EB=8A=A5?=
 =?UTF-8?q?=20=EA=B5=AC=ED=98=84?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../ReadStatusUpdateRequestDto.java           |  8 +++
 .../service/readstatus/ReadStatusService.java | 41 ++++++++++++++
 .../domain/readStatus/ReadStatus.java         | 49 ++++++++++++++++
 .../ReadStatusInMemoryRepository.java         | 56 +++++++++++++++++++
 .../interfaces/ReadStatusRepository.java      | 13 +++++
 ...0 \353\252\250\353\215\270\353\247\201.md" |  5 ++
 6 files changed, 172 insertions(+)
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/readstatus/ReadStatusUpdateRequestDto.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/readstatus/ReadStatusService.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/readStatus/ReadStatus.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/readstatus/ReadStatusInMemoryRepository.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/readstatus/interfaces/ReadStatusRepository.java

diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/readstatus/ReadStatusUpdateRequestDto.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/readstatus/ReadStatusUpdateRequestDto.java
new file mode 100644
index 000000000..b2060bb36
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/readstatus/ReadStatusUpdateRequestDto.java
@@ -0,0 +1,8 @@
+package com.sprint.mission.discodeit.application.dto.readstatus;
+
+import java.util.UUID;
+
+public record ReadStatusUpdateRequestDto(
+        UUID channelId
+) {
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/readstatus/ReadStatusService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/readstatus/ReadStatusService.java
new file mode 100644
index 000000000..33b390387
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/readstatus/ReadStatusService.java
@@ -0,0 +1,41 @@
+package com.sprint.mission.discodeit.application.service.readstatus;
+
+import com.sprint.mission.discodeit.application.dto.readstatus.ReadStatusUpdateRequestDto;
+import com.sprint.mission.discodeit.application.service.interfaces.ChannelService;
+import com.sprint.mission.discodeit.application.service.interfaces.UserService;
+import com.sprint.mission.discodeit.domain.channel.Channel;
+import com.sprint.mission.discodeit.domain.readStatus.ReadStatus;
+import com.sprint.mission.discodeit.domain.user.User;
+import com.sprint.mission.discodeit.repository.readstatus.interfaces.ReadStatusRepository;
+import java.time.Instant;
+import java.util.Optional;
+import java.util.UUID;
+
+public class ReadStatusService {
+
+    private final ReadStatusRepository readStatusRepository;
+    private final UserService userService;
+    private final ChannelService channelService;
+
+    public ReadStatusService(
+            ReadStatusRepository readStatusRepository,
+            UserService userService,
+            ChannelService channelService
+    ) {
+        this.readStatusRepository = readStatusRepository;
+        this.userService = userService;
+        this.channelService = channelService;
+    }
+
+    public void updateLastReadTime(UUID userId, ReadStatusUpdateRequestDto requestDto) {
+        User foundUser = userService.findOneByIdOrThrow(userId);
+        Channel foundChannel = channelService.findOneByIdOrThrow(requestDto.channelId());
+        ReadStatus readStatus = findOneByUserIdAndChannelId(foundUser, foundChannel).orElseGet(() -> new ReadStatus(foundUser, foundChannel));
+        readStatus.updateLastReadAt(Instant.now());
+        readStatusRepository.save(readStatus);
+    }
+
+    public Optional<ReadStatus> findOneByUserIdAndChannelId(User foundUser, Channel foundChannel) {
+        return readStatusRepository.findOneByUserIdAndChannelId(foundUser, foundChannel);
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/readStatus/ReadStatus.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/readStatus/ReadStatus.java
new file mode 100644
index 000000000..b72f3f4e8
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/readStatus/ReadStatus.java
@@ -0,0 +1,49 @@
+package com.sprint.mission.discodeit.domain.readStatus;
+
+import com.sprint.mission.discodeit.domain.channel.Channel;
+import com.sprint.mission.discodeit.domain.user.User;
+import java.time.Instant;
+import java.util.Objects;
+import java.util.UUID;
+
+public class ReadStatus {
+
+    private final UUID id;
+    private final User user;
+    private final Channel channel;
+    private final Instant createdAt;
+    private Instant updatedAt;
+    private Instant lastReadAt;
+
+    public ReadStatus(User user, Channel channel) {
+        validate(user, channel);
+        id = UUID.randomUUID();
+        this.user = user;
+        this.channel = channel;
+        this.createdAt = Instant.now();
+        this.updatedAt = Instant.now();
+        this.lastReadAt = Instant.now();
+    }
+
+    public void updateLastReadAt(Instant lastReadAt) {
+        this.lastReadAt = lastReadAt;
+        this.updatedAt = lastReadAt;
+    }
+
+    private void validate(User user, Channel channel) {
+        if (Objects.isNull(user)) {
+            throw new IllegalArgumentException("user is null");
+        }
+        if (Objects.isNull(channel)) {
+            throw new IllegalArgumentException("channel is null");
+        }
+    }
+
+    public User getUser() {
+        return user;
+    }
+
+    public Channel getChannel() {
+        return channel;
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/readstatus/ReadStatusInMemoryRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/readstatus/ReadStatusInMemoryRepository.java
new file mode 100644
index 000000000..41a252029
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/readstatus/ReadStatusInMemoryRepository.java
@@ -0,0 +1,56 @@
+package com.sprint.mission.discodeit.repository.readstatus;
+
+import com.sprint.mission.discodeit.domain.channel.Channel;
+import com.sprint.mission.discodeit.domain.readStatus.ReadStatus;
+import com.sprint.mission.discodeit.domain.user.User;
+import com.sprint.mission.discodeit.repository.readstatus.interfaces.ReadStatusRepository;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.UUID;
+
+public class ReadStatusInMemoryRepository implements ReadStatusRepository {
+
+    private final Map<ReadStatusKey, ReadStatus> readStatusMap = new HashMap<>();
+
+    @Override
+    public ReadStatus save(ReadStatus readStatus) {
+        ReadStatusKey readStatusKey = new ReadStatusKey(readStatus.getUser(), readStatus.getChannel());
+        readStatusMap.put(readStatusKey, readStatus);
+        return readStatus;
+    }
+
+    @Override
+    public Optional<ReadStatus> findOneByUserIdAndChannelId(User user, Channel channel) {
+        ReadStatusKey readStatusKey = new ReadStatusKey(user, channel);
+        return Optional.ofNullable(readStatusMap.get(readStatusKey));
+    }
+
+    private static class ReadStatusKey {
+        private final UUID userId;
+        private final UUID channelId;
+
+        public ReadStatusKey(User user, Channel channel) {
+            this.userId = user.getId();
+            this.channelId = channel.getId();
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            if (this == o) {
+                return true;
+            }
+            if (o == null || getClass() != o.getClass()) {
+                return false;
+            }
+            ReadStatusKey that = (ReadStatusKey) o;
+            return Objects.equals(userId, that.userId) && Objects.equals(channelId, that.channelId);
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(userId, channelId);
+        }
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/readstatus/interfaces/ReadStatusRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/readstatus/interfaces/ReadStatusRepository.java
new file mode 100644
index 000000000..ff07a73ae
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/readstatus/interfaces/ReadStatusRepository.java
@@ -0,0 +1,13 @@
+package com.sprint.mission.discodeit.repository.readstatus.interfaces;
+
+import com.sprint.mission.discodeit.domain.channel.Channel;
+import com.sprint.mission.discodeit.domain.readStatus.ReadStatus;
+import com.sprint.mission.discodeit.domain.user.User;
+import java.util.Optional;
+
+public interface ReadStatusRepository {
+
+    ReadStatus save(ReadStatus readStatus);
+
+    Optional<ReadStatus> findOneByUserIdAndChannelId(User user, Channel channel);
+}
diff --git "a/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md" "b/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md"
index 492fe1211..10c59d54c 100644
--- "a/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md"	
+++ "b/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md"	
@@ -69,6 +69,11 @@
   - 사용자가 채널 별 마지막으로 메시지를 읽은 시간을 표현하는 도메인 모델입니다. 사용자별 각 채널에 읽지 않은 메시지를 확인하기 위해 활용합니다.
   - `id`, `createdAt`, `updatedAt`
 
+  - 유저가 채널별 읽은 시간을 기록한다.
+    - 유저가 채널에 접속한 시간을 업데이트한다.
+      - 접속한 적이 없는 경우에는 새로운 객체를 생성하여 저장한다.
+      - 접속한 적이 있는 경우에는 기존 객체의 접속 시간을 업데이트한다.
+
 ## UserStatus
 - 사용자 별 마지막으로 확인된 접속 시간을 표현하는 도메인 모델입니다. 사용자의 온라인 상태를 확인하기 위해 활용합니다.
 - 마지막 접속 시간을 기준으로 현재 로그인한 유저로 판단할 수 있는 메소드를 정의하세요.

From eb5079a99927811f5523e6c6c23a9f5a5821f731 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?=
 <157946706+jaewoo9797@users.noreply.github.com>
Date: Mon, 10 Feb 2025 16:21:05 +0900
Subject: [PATCH 24/38] =?UTF-8?q?feat:=20userstatus=20=EA=B8=B0=EB=8A=A5?=
 =?UTF-8?q?=20=EA=B5=AC=ED=98=84?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../service/user/converter/UserConverter.java |  2 +-
 .../service/userstatus/UserStatusService.java | 39 +++++++++++++++
 .../domain/userstatus/UserStatus.java         | 47 +++++++++++++++++++
 .../domain/userstatus/enums/OnlineStatus.java |  6 +++
 .../discodeit/global/error/ErrorCode.java     |  1 -
 .../UserStatusInMemoryRepository.java         | 25 ++++++++++
 .../interfaces/UserStatusRepository.java      | 12 +++++
 .../discodeit/domain/user/EmailTest.java      |  2 +-
 8 files changed, 131 insertions(+), 3 deletions(-)
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/userstatus/UserStatusService.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/userstatus/UserStatus.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/userstatus/enums/OnlineStatus.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/userstatus/UserStatusInMemoryRepository.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/userstatus/interfaces/UserStatusRepository.java

diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/converter/UserConverter.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/converter/UserConverter.java
index fc0c7f045..79c3affb8 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/converter/UserConverter.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/converter/UserConverter.java
@@ -21,7 +21,7 @@ public User toUser(joinUserRequestDto requestDto) {
             .email(new Email(requestDto.email()))
             .password(new Password(requestDto.password()))
             .birthDate(new BirthDate(requestDto.birthDate()))
-            .emailSubscriptionStatus(EmailSubscriptionStatus.UNSUBSCRIBED)  // TODO 이넘 타입 dto에서 어떻게 받아서 넘겨야하나.
+            .emailSubscriptionStatus(EmailSubscriptionStatus.UNSUBSCRIBED)
             .build();
     }
 
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/userstatus/UserStatusService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/userstatus/UserStatusService.java
new file mode 100644
index 000000000..c53f109e7
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/userstatus/UserStatusService.java
@@ -0,0 +1,39 @@
+package com.sprint.mission.discodeit.application.service.userstatus;
+
+import com.sprint.mission.discodeit.application.service.interfaces.UserService;
+import com.sprint.mission.discodeit.domain.user.User;
+import com.sprint.mission.discodeit.domain.userstatus.UserStatus;
+import com.sprint.mission.discodeit.domain.userstatus.enums.OnlineStatus;
+import com.sprint.mission.discodeit.repository.userstatus.interfaces.UserStatusRepository;
+import java.util.UUID;
+
+public class UserStatusService {
+
+    private final UserStatusRepository userStatusRepository;
+    private final UserService userService;
+
+    public UserStatusService(
+            UserStatusRepository userStatusRepository,
+            UserService userService
+    ) {
+        this.userStatusRepository = userStatusRepository;
+        this.userService = userService;
+    }
+
+    public UserStatus findOneByUser(User user) {
+        return userStatusRepository.findByUser(user).orElse(new UserStatus(user));
+    }
+
+    public void updateLastAccessTime(UUID userId) {
+        User foundUser = userService.findOneByIdOrThrow(userId);
+        UserStatus foundUserStatus = findOneByUser(foundUser);
+        foundUserStatus.updateLastAccessedAt();
+        userStatusRepository.save(foundUserStatus);
+    }
+
+    public OnlineStatus getUserStatus(UUID userId) {
+        User foundUser = userService.findOneByIdOrThrow(userId);
+        UserStatus foundUserStatus = findOneByUser(foundUser);
+        return foundUserStatus.getOnlineStatus();
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/userstatus/UserStatus.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/userstatus/UserStatus.java
new file mode 100644
index 000000000..49fbf6878
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/userstatus/UserStatus.java
@@ -0,0 +1,47 @@
+package com.sprint.mission.discodeit.domain.userstatus;
+
+import com.sprint.mission.discodeit.domain.user.User;
+import com.sprint.mission.discodeit.domain.userstatus.enums.OnlineStatus;
+import java.time.Instant;
+import java.time.temporal.ChronoUnit;
+import java.util.Objects;
+import java.util.UUID;
+
+public class UserStatus {
+
+    private final UUID id;
+    private final User user;
+    private final Instant createdAt;
+    private Instant updatedAt;
+    private Instant lastAccessedAt;
+
+    public UserStatus(User user) {
+        validate(user);
+        this.id = UUID.randomUUID();
+        this.user = user;
+        this.createdAt = Instant.now();
+        this.updatedAt = Instant.now();
+        this.lastAccessedAt = Instant.now();
+    }
+
+    private void validate(User user) {
+        if (Objects.isNull(user)) {
+            throw new IllegalArgumentException("user is null");
+        }
+    }
+
+    public void updateLastAccessedAt() {
+        this.lastAccessedAt = Instant.now();
+    }
+
+    public OnlineStatus getOnlineStatus() {
+        if (lastAccessedAt.isAfter(Instant.now().minus(5, ChronoUnit.MINUTES))) {
+            return OnlineStatus.ONLINE;
+        }
+        return OnlineStatus.OFFLINE;
+    }
+
+    public User getUser() {
+        return user;
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/userstatus/enums/OnlineStatus.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/userstatus/enums/OnlineStatus.java
new file mode 100644
index 000000000..a1b2590a0
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/userstatus/enums/OnlineStatus.java
@@ -0,0 +1,6 @@
+package com.sprint.mission.discodeit.domain.userstatus.enums;
+
+public enum OnlineStatus {
+    ONLINE,
+    OFFLINE
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorCode.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorCode.java
index 94e5dedaa..9b88e3409 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorCode.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorCode.java
@@ -49,5 +49,4 @@ public int getStatus() {
     public String getDescription() {
         return description;
     }
-
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/userstatus/UserStatusInMemoryRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/userstatus/UserStatusInMemoryRepository.java
new file mode 100644
index 000000000..4f9e72b9e
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/userstatus/UserStatusInMemoryRepository.java
@@ -0,0 +1,25 @@
+package com.sprint.mission.discodeit.repository.userstatus;
+
+import com.sprint.mission.discodeit.domain.user.User;
+import com.sprint.mission.discodeit.domain.userstatus.UserStatus;
+import com.sprint.mission.discodeit.repository.userstatus.interfaces.UserStatusRepository;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Optional;
+
+public class UserStatusInMemoryRepository implements UserStatusRepository {
+
+    private final Map<User, UserStatus> userStatuses = new HashMap<>();
+
+    @Override
+    public UserStatus save(UserStatus userStatus) {
+        User user = userStatus.getUser();
+        userStatuses.put(user, userStatus);
+        return userStatus;
+    }
+
+    @Override
+    public Optional<UserStatus> findByUser(User user) {
+        return Optional.ofNullable(userStatuses.get(user));
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/userstatus/interfaces/UserStatusRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/userstatus/interfaces/UserStatusRepository.java
new file mode 100644
index 000000000..d66ef1b09
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/userstatus/interfaces/UserStatusRepository.java
@@ -0,0 +1,12 @@
+package com.sprint.mission.discodeit.repository.userstatus.interfaces;
+
+import com.sprint.mission.discodeit.domain.user.User;
+import com.sprint.mission.discodeit.domain.userstatus.UserStatus;
+import java.util.Optional;
+
+public interface UserStatusRepository {
+
+    UserStatus save(UserStatus userStatus);
+
+    Optional<UserStatus> findByUser(User user);
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/EmailTest.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/EmailTest.java
index 352a39b5d..a5c432ce4 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/EmailTest.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/domain/user/EmailTest.java
@@ -52,7 +52,7 @@ class EmailTest {
             "abc@.com",         // 도메인 앞부분 없음
             "abc@exam_ple.com", // 언더스코어 포함 (일반적으로 허용되지 않음)
     })
-    void 이메일_생성_Invalid값_에러throw(String email) {
+    void 이메일_생성_Invalid_값_에러throw(String email) {
         //given
         // when
         Throwable throwable = Assertions.catchThrowable(() -> new Email(email));

From c6ad93ebdb9a725af76e3a4bde8ade2482b93025 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?=
 <157946706+jaewoo9797@users.noreply.github.com>
Date: Mon, 10 Feb 2025 18:52:30 +0900
Subject: [PATCH 25/38] =?UTF-8?q?feat:=20user=20profile=20=EC=9D=B4?=
 =?UTF-8?q?=EB=AF=B8=EC=A7=80=20=EA=B4=80=EB=A6=AC?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../discodeit/domain/binarycontent/Asset.java |  4 +++
 .../domain/binarycontent/BinaryContent.java   | 35 +++++++++++++++++++
 .../binarycontent/enums/BinaryType.java       |  4 +++
 .../discodeit/domain/user/ProfileImage.java   |  4 +++
 .../domain/userstatus/UserStatus.java         |  2 --
 .../BinaryInMemoryRepository.java             | 14 ++++++++
 .../interfaces/BinaryRepository.java          |  9 +++++
 ...0 \353\252\250\353\215\270\353\247\201.md" |  2 ++
 8 files changed, 72 insertions(+), 2 deletions(-)
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/binarycontent/Asset.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/binarycontent/BinaryContent.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/binarycontent/enums/BinaryType.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/ProfileImage.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/binarycontent/BinaryInMemoryRepository.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/binarycontent/interfaces/BinaryRepository.java

diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/binarycontent/Asset.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/binarycontent/Asset.java
new file mode 100644
index 000000000..7b67d5136
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/binarycontent/Asset.java
@@ -0,0 +1,4 @@
+package com.sprint.mission.discodeit.domain.binarycontent;
+
+public class Asset {
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/binarycontent/BinaryContent.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/binarycontent/BinaryContent.java
new file mode 100644
index 000000000..3e85006ec
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/binarycontent/BinaryContent.java
@@ -0,0 +1,35 @@
+package com.sprint.mission.discodeit.domain.binarycontent;
+
+import com.sprint.mission.discodeit.domain.binarycontent.enums.BinaryType;
+import com.sprint.mission.discodeit.domain.message.Message;
+import com.sprint.mission.discodeit.domain.user.User;
+import java.time.Instant;
+import java.util.Objects;
+import java.util.UUID;
+
+public class BinaryContent {
+
+    private final UUID id;
+    private final Instant createdAt;
+    private final User user;
+    private final Message message;
+    private final Asset asset;
+    private final BinaryType binaryType;
+
+    public BinaryContent(User user, Message message, Asset asset, BinaryType binaryType) {
+        validate(user, message, binaryType);
+        this.id = UUID.randomUUID();
+        this.createdAt = Instant.now();
+        this.user = user;
+        this.message = message;
+        this.asset = asset;
+        this.binaryType = binaryType;
+    }
+
+    private void validate(User user, Message message, BinaryType binaryType) {
+        if (Objects.isNull(user) || Objects.isNull(message) || Objects.isNull(asset)) {
+            throw new IllegalArgumentException();
+        }
+    }
+
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/binarycontent/enums/BinaryType.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/binarycontent/enums/BinaryType.java
new file mode 100644
index 000000000..f831cfab4
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/binarycontent/enums/BinaryType.java
@@ -0,0 +1,4 @@
+package com.sprint.mission.discodeit.domain.binarycontent.enums;
+
+public enum BinaryType {
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/ProfileImage.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/ProfileImage.java
new file mode 100644
index 000000000..2b4eedfb5
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/ProfileImage.java
@@ -0,0 +1,4 @@
+package com.sprint.mission.discodeit.domain.user;
+
+public class ProfileImage {
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/userstatus/UserStatus.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/userstatus/UserStatus.java
index 49fbf6878..be26baf53 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/userstatus/UserStatus.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/userstatus/UserStatus.java
@@ -12,7 +12,6 @@ public class UserStatus {
     private final UUID id;
     private final User user;
     private final Instant createdAt;
-    private Instant updatedAt;
     private Instant lastAccessedAt;
 
     public UserStatus(User user) {
@@ -20,7 +19,6 @@ public UserStatus(User user) {
         this.id = UUID.randomUUID();
         this.user = user;
         this.createdAt = Instant.now();
-        this.updatedAt = Instant.now();
         this.lastAccessedAt = Instant.now();
     }
 
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/binarycontent/BinaryInMemoryRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/binarycontent/BinaryInMemoryRepository.java
new file mode 100644
index 000000000..98e555287
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/binarycontent/BinaryInMemoryRepository.java
@@ -0,0 +1,14 @@
+package com.sprint.mission.discodeit.repository.binarycontent;
+
+import com.sprint.mission.discodeit.domain.binarycontent.BinaryContent;
+import com.sprint.mission.discodeit.repository.binarycontent.interfaces.BinaryRepository;
+
+public class BinaryInMemoryRepository implements BinaryRepository {
+
+    @Override
+    public BinaryContent save(BinaryContent binaryContent) {
+
+        return binaryContent;
+    }
+
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/binarycontent/interfaces/BinaryRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/binarycontent/interfaces/BinaryRepository.java
new file mode 100644
index 000000000..f4dc32c84
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/binarycontent/interfaces/BinaryRepository.java
@@ -0,0 +1,9 @@
+package com.sprint.mission.discodeit.repository.binarycontent.interfaces;
+
+import com.sprint.mission.discodeit.domain.binarycontent.BinaryContent;
+
+public interface BinaryRepository {
+
+    BinaryContent save(BinaryContent binaryContent);
+
+}
diff --git "a/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md" "b/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md"
index 10c59d54c..397dfebe4 100644
--- "a/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md"	
+++ "b/codeit-bootcamp-spring/1-sprint-mission/study/\353\217\204\353\251\224\354\235\270 \353\252\250\353\215\270\353\247\201.md"	
@@ -26,6 +26,8 @@
   - 사용하고 있는 유저이름인지 검증한다.
   - 비밀번호를 저장할 때 암호화를 진행한다.
     - [jBCrypt](https://www.mindrot.org/projects/jBCrypt/)
+  - 회원 프로필 사진을 저장한다.
+    - 파일을 입력받아 저장한다.
 
 - 로그인
   - `이메일`과 `비밀번호`를 입력받는다.

From d08f484abcd878b953c2b86cdc876c58091761a1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?=
 <157946706+jaewoo9797@users.noreply.github.com>
Date: Tue, 11 Feb 2025 11:04:35 +0900
Subject: [PATCH 26/38] =?UTF-8?q?feat:=20user,=20channel=20service=20?=
 =?UTF-8?q?=EA=B3=A0=EB=8F=84=ED=99=94=20=EA=B8=B0=EB=8A=A5=EC=9A=94?=
 =?UTF-8?q?=EA=B5=AC=20=EC=82=AC=ED=95=AD=20=EC=B6=94=EA=B0=80?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../dto/channel/CreateChannelRequestDto.java  |  3 +-
 .../dto/channel/InviteChannelRequestDto.java  |  8 ++++
 .../application/dto/user/UserResponseDto.java |  5 ++-
 .../service/channel/JCFChannelService.java    | 45 ++++++++++++++++---
 .../service/interfaces/ChannelService.java    |  9 +++-
 .../service/interfaces/UserService.java       |  4 ++
 .../service/user/JCFUserService.java          | 29 +++++++++++-
 .../service/user/converter/UserConverter.java | 24 ++--------
 .../service/userstatus/UserStatusService.java | 12 ++++-
 .../discodeit/domain/channel/Channel.java     | 17 ++++++-
 .../domain/channel/ParticipatedUser.java      | 15 +++++++
 .../channel/enums/ChannelVisibility.java      |  6 +++
 .../discodeit/global/error/ErrorResponse.java | 44 ++++++++++++++++++
 .../global/error/GlobalException.java         | 39 ++++++++++++++++
 .../error/exception/BusinessException.java    |  4 ++
 .../repository/user/FileUserRepository.java   | 11 +++++
 .../user/InMemoryUserRepository.java          | 13 ++++++
 .../user/interfaces/UserRepository.java       |  5 +++
 .../UserStatusInMemoryRepository.java         |  7 +++
 .../interfaces/UserStatusRepository.java      |  2 +
 .../fake/repository/FakeUserRepository.java   | 13 ++++++
 21 files changed, 283 insertions(+), 32 deletions(-)
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/InviteChannelRequestDto.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/ParticipatedUser.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/enums/ChannelVisibility.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorResponse.java
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/GlobalException.java

diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/CreateChannelRequestDto.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/CreateChannelRequestDto.java
index 2315ce67c..eb690f48e 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/CreateChannelRequestDto.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/CreateChannelRequestDto.java
@@ -1,9 +1,10 @@
 package com.sprint.mission.discodeit.application.dto.channel;
 
+import com.sprint.mission.discodeit.domain.channel.enums.ChannelType;
 import jakarta.validation.constraints.NotBlank;
 
 public record CreateChannelRequestDto(
         @NotBlank String name,
-        @NotBlank String channelType
+        @NotBlank ChannelType channelType
 ) {
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/InviteChannelRequestDto.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/InviteChannelRequestDto.java
new file mode 100644
index 000000000..e9aea23dd
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/InviteChannelRequestDto.java
@@ -0,0 +1,8 @@
+package com.sprint.mission.discodeit.application.dto.channel;
+
+import java.util.UUID;
+
+public record InviteChannelRequestDto(
+        UUID channelId
+) {
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/user/UserResponseDto.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/user/UserResponseDto.java
index cee99c944..06e4b0f50 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/user/UserResponseDto.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/user/UserResponseDto.java
@@ -1,9 +1,12 @@
 package com.sprint.mission.discodeit.application.dto.user;
 
+import com.sprint.mission.discodeit.domain.userstatus.enums.OnlineStatus;
+
 public record UserResponseDto(
     String nickname,
     String username,
-    String email
+    String email,
+    OnlineStatus onlineStatus
 ) {
 
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java
index 7e4c20340..b07e6e983 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java
@@ -5,39 +5,74 @@
 import com.sprint.mission.discodeit.application.dto.channel.ChannelResponseDto;
 import com.sprint.mission.discodeit.application.dto.channel.CreateChannelRequestDto;
 import com.sprint.mission.discodeit.application.dto.channel.DeleteChannelRequestDto;
+import com.sprint.mission.discodeit.application.dto.channel.InviteChannelRequestDto;
 import com.sprint.mission.discodeit.application.service.interfaces.ChannelService;
 import com.sprint.mission.discodeit.application.service.interfaces.UserService;
 import com.sprint.mission.discodeit.domain.channel.Channel;
 import com.sprint.mission.discodeit.domain.channel.enums.ChannelType;
+import com.sprint.mission.discodeit.domain.channel.enums.ChannelVisibility;
 import com.sprint.mission.discodeit.domain.channel.exception.ChannelNotFoundException;
+import com.sprint.mission.discodeit.domain.readStatus.ReadStatus;
 import com.sprint.mission.discodeit.domain.user.User;
 import com.sprint.mission.discodeit.global.error.ErrorCode;
 import com.sprint.mission.discodeit.repository.channel.interfaces.ChannelRepository;
+import com.sprint.mission.discodeit.repository.readstatus.interfaces.ReadStatusRepository;
 import java.util.UUID;
 
 public class JCFChannelService implements ChannelService {
 
     private final ChannelRepository channelRepository;
     private final UserService userService;
+    private final ReadStatusRepository readStatusRepository;
 
     public JCFChannelService(
             ChannelRepository channelRepository,
-            UserService userService
+            UserService userService,
+            ReadStatusRepository readStatusService
     ) {
         this.channelRepository = channelRepository;
         this.userService = userService;
+        this.readStatusRepository = readStatusService;
     }
 
     @Override
-    public ChannelResponseDto create(UUID userId, CreateChannelRequestDto requestDto) {
+    public ChannelResponseDto createPublicChannel(UUID userId, CreateChannelRequestDto requestDto) {
         User foundUser = userService.findOneByIdOrThrow(userId);
-        // TODO 예외 발생할 수 있음 -> 이넘타입에 존재하지 않을 경우
-        ChannelType channelType = ChannelType.valueOf(requestDto.channelType());
-        Channel createChannel = new Channel(requestDto.name(), channelType, foundUser);
+        // TODO 예외 발생할 수 있음 -> Request에 이넘타입에 존재하지 않을 경우
+        ChannelType channelType = requestDto.channelType();
+        Channel createChannel = new Channel(requestDto.name(), channelType, foundUser, ChannelVisibility.PUBLIC);
         Channel savedChannel = channelRepository.save(createChannel);
         return ChannelResponseDto.from(savedChannel);
     }
 
+    @Override
+    public ChannelResponseDto createPrivateChannel(UUID userId) {
+        User foundUser = userService.findOneByIdOrThrow(userId);
+        Channel createChannel = Channel.ofPrivateChannel(foundUser, ChannelType.TEXT);
+        Channel savedChannel = channelRepository.save(createChannel);
+        ReadStatus readStatus = new ReadStatus(foundUser, savedChannel);
+        readStatusRepository.save(readStatus);
+        return ChannelResponseDto.from(savedChannel);
+    }
+
+    @Override
+    public void joinPublicChannel(UUID invitedUserId, InviteChannelRequestDto requestDto) {
+        User foundUser = userService.findOneByIdOrThrow(invitedUserId);
+        Channel foundChannel = findOneByIdOrThrow(requestDto.channelId());
+        foundChannel.join(foundUser);
+        channelRepository.save(foundChannel);
+    }
+
+    @Override
+    public void joinPrivateChannel(UUID invitedUserId, InviteChannelRequestDto requestDto) {
+        User foundUser = userService.findOneByIdOrThrow(invitedUserId);
+        Channel foundChannel = findOneByIdOrThrow(requestDto.channelId());
+        foundChannel.join(foundUser);
+        ReadStatus readStatus = new ReadStatus(foundUser, foundChannel);
+        readStatusRepository.save(readStatus);
+        channelRepository.save(foundChannel);
+    }
+
     @Override
     public Channel findOneByIdOrThrow(UUID id) {
         return channelRepository.findOneById(id)
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/ChannelService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/ChannelService.java
index 3d94a2a1a..14dd7d728 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/ChannelService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/ChannelService.java
@@ -5,12 +5,19 @@
 import com.sprint.mission.discodeit.application.dto.channel.ChannelResponseDto;
 import com.sprint.mission.discodeit.application.dto.channel.CreateChannelRequestDto;
 import com.sprint.mission.discodeit.application.dto.channel.DeleteChannelRequestDto;
+import com.sprint.mission.discodeit.application.dto.channel.InviteChannelRequestDto;
 import com.sprint.mission.discodeit.domain.channel.Channel;
 import java.util.UUID;
 
 public interface ChannelService {
 
-    ChannelResponseDto create(UUID userId, CreateChannelRequestDto requestDto);
+    ChannelResponseDto createPublicChannel(UUID userId, CreateChannelRequestDto requestDto);
+
+    ChannelResponseDto createPrivateChannel(UUID userId);
+
+    void joinPublicChannel(UUID invitedUserId, InviteChannelRequestDto requestDto);
+
+    void joinPrivateChannel(UUID invitedUserId, InviteChannelRequestDto requestDto);
 
     Channel findOneByIdOrThrow(UUID uuid);
 
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/UserService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/UserService.java
index ca3654f36..836c2bdb0 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/UserService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/UserService.java
@@ -5,6 +5,7 @@
 import com.sprint.mission.discodeit.application.dto.user.UserResponseDto;
 import com.sprint.mission.discodeit.application.dto.user.joinUserRequestDto;
 import com.sprint.mission.discodeit.domain.user.User;
+import java.util.List;
 import java.util.UUID;
 
 public interface UserService {
@@ -15,6 +16,9 @@ public interface UserService {
 
     User findOneByIdOrThrow(UUID userId);
 
+    List<UserResponseDto> findAll();
+
     void changePassword(UUID userId, ChangePasswordRequestDto requestDto);
 
+    void quitUser(UUID userId);
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/JCFUserService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/JCFUserService.java
index 73ddc6646..c809e7a0e 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/JCFUserService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/JCFUserService.java
@@ -7,6 +7,7 @@
 import com.sprint.mission.discodeit.application.dto.user.joinUserRequestDto;
 import com.sprint.mission.discodeit.application.service.interfaces.UserService;
 import com.sprint.mission.discodeit.application.service.user.converter.UserConverter;
+import com.sprint.mission.discodeit.application.service.userstatus.UserStatusService;
 import com.sprint.mission.discodeit.domain.user.BirthDate;
 import com.sprint.mission.discodeit.domain.user.Email;
 import com.sprint.mission.discodeit.domain.user.Nickname;
@@ -18,8 +19,10 @@
 import com.sprint.mission.discodeit.domain.user.exception.InvalidLoginException;
 import com.sprint.mission.discodeit.domain.user.exception.UserNotFoundException;
 import com.sprint.mission.discodeit.domain.user.validation.PasswordValidator;
+import com.sprint.mission.discodeit.domain.userstatus.UserStatus;
 import com.sprint.mission.discodeit.global.error.ErrorCode;
 import com.sprint.mission.discodeit.repository.user.interfaces.UserRepository;
+import java.util.List;
 import java.util.UUID;
 import org.springframework.stereotype.Service;
 
@@ -29,15 +32,18 @@ public class JCFUserService implements UserService {
     private final UserRepository userRepository;
     private final UserConverter userConverter;
     private final PasswordEncoder passwordEncoder;
+    private final UserStatusService userStatusService;
 
     public JCFUserService(
             UserRepository userRepository,
             UserConverter userConverter,
-            PasswordEncoder passwordEncoder
+            PasswordEncoder passwordEncoder,
+            UserStatusService userStatusService
     ) {
         this.userRepository = userRepository;
         this.userConverter = userConverter;
         this.passwordEncoder = passwordEncoder;
+        this.userStatusService = userStatusService;
     }
 
     @Override
@@ -46,7 +52,8 @@ public UserResponseDto join(joinUserRequestDto requestDto) {
         throwUsernameAlreadyUsed(requestDto.username());
         PasswordValidator.validateOrThrow(requestDto.password());
         User savedUser = userRepository.save(toUserWithPasswordEncode(requestDto));
-        return userConverter.toDto(savedUser);
+        UserStatus savedUserStatus = userStatusService.createAtFirstJoin(savedUser);
+        return userConverter.toDto(savedUser, savedUserStatus);
     }
 
     @Override
@@ -64,6 +71,17 @@ public User findOneByIdOrThrow(UUID uuid) {
                 .orElseThrow(() -> new UserNotFoundException(ErrorCode.NOT_FOUND));
     }
 
+    @Override
+    public List<UserResponseDto> findAll() {
+        List<User> users = userRepository.findAll();
+        return users.stream()
+                .map(user -> {
+                    UserStatus userStatus = userStatusService.findOneByUser(user);
+                    return userConverter.toDto(user, userStatus);
+                })
+                .toList();
+    }
+
     @Override
     public void changePassword(UUID userId, ChangePasswordRequestDto requestDto) {
         PasswordValidator.validateOrThrow(requestDto.password());
@@ -72,6 +90,13 @@ public void changePassword(UUID userId, ChangePasswordRequestDto requestDto) {
         userRepository.save(foundUser);
     }
 
+    @Override
+    public void quitUser(UUID userId) {
+        User foundUser = findOneByIdOrThrow(userId);
+        userStatusService.delete(foundUser);
+        userRepository.deleteByUser(foundUser);
+    }
+
     private void throwEmailAlreadyUsed(String email) {
         if (userRepository.isExistByEmail(new Email(email))) {
             throw new AlreadyUserExistsException(ErrorCode.DUPLICATE_EMAIL, email);
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/converter/UserConverter.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/converter/UserConverter.java
index 79c3affb8..cd9e6aa38 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/converter/UserConverter.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/converter/UserConverter.java
@@ -1,31 +1,15 @@
 package com.sprint.mission.discodeit.application.service.user.converter;
 
-import com.sprint.mission.discodeit.application.dto.user.joinUserRequestDto;
 import com.sprint.mission.discodeit.application.dto.user.UserResponseDto;
-import com.sprint.mission.discodeit.domain.user.BirthDate;
-import com.sprint.mission.discodeit.domain.user.Email;
-import com.sprint.mission.discodeit.domain.user.Nickname;
-import com.sprint.mission.discodeit.domain.user.Password;
 import com.sprint.mission.discodeit.domain.user.User;
-import com.sprint.mission.discodeit.domain.user.Username;
-import com.sprint.mission.discodeit.domain.user.enums.EmailSubscriptionStatus;
+import com.sprint.mission.discodeit.domain.userstatus.UserStatus;
 import org.springframework.stereotype.Component;
 
 @Component
 public class UserConverter {
 
-    public User toUser(joinUserRequestDto requestDto) {
-        return User.builder()
-            .username(new Username(requestDto.username()))
-            .nickname(new Nickname(requestDto.nickname()))
-            .email(new Email(requestDto.email()))
-            .password(new Password(requestDto.password()))
-            .birthDate(new BirthDate(requestDto.birthDate()))
-            .emailSubscriptionStatus(EmailSubscriptionStatus.UNSUBSCRIBED)
-            .build();
-    }
-
-    public UserResponseDto toDto(User user) {
-        return new UserResponseDto(user.getNicknameValue(),user.getUsernameValue(),user.getEmailValue());
+    public UserResponseDto toDto(User user, UserStatus userStatus) {
+        return new UserResponseDto(user.getNicknameValue(), user.getUsernameValue(), user.getEmailValue(),
+                userStatus.getOnlineStatus());
     }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/userstatus/UserStatusService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/userstatus/UserStatusService.java
index c53f109e7..9ae4e28a9 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/userstatus/UserStatusService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/userstatus/UserStatusService.java
@@ -6,7 +6,9 @@
 import com.sprint.mission.discodeit.domain.userstatus.enums.OnlineStatus;
 import com.sprint.mission.discodeit.repository.userstatus.interfaces.UserStatusRepository;
 import java.util.UUID;
+import org.springframework.stereotype.Service;
 
+@Service
 public class UserStatusService {
 
     private final UserStatusRepository userStatusRepository;
@@ -20,6 +22,10 @@ public UserStatusService(
         this.userService = userService;
     }
 
+    public UserStatus createAtFirstJoin(User user) {
+        return userStatusRepository.save(new UserStatus(user));
+    }
+
     public UserStatus findOneByUser(User user) {
         return userStatusRepository.findByUser(user).orElse(new UserStatus(user));
     }
@@ -31,9 +37,13 @@ public void updateLastAccessTime(UUID userId) {
         userStatusRepository.save(foundUserStatus);
     }
 
-    public OnlineStatus getUserStatus(UUID userId) {
+    public OnlineStatus getUserOlineStatus(UUID userId) {
         User foundUser = userService.findOneByIdOrThrow(userId);
         UserStatus foundUserStatus = findOneByUser(foundUser);
         return foundUserStatus.getOnlineStatus();
     }
+
+    public void delete(User targetUser) {
+        userStatusRepository.deleteByUser(targetUser);
+    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java
index 90595fa62..600fe922b 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java
@@ -1,6 +1,7 @@
 package com.sprint.mission.discodeit.domain.channel;
 
 import com.sprint.mission.discodeit.domain.channel.enums.ChannelType;
+import com.sprint.mission.discodeit.domain.channel.enums.ChannelVisibility;
 import com.sprint.mission.discodeit.domain.channel.exception.ChannelNameInvalidException;
 import com.sprint.mission.discodeit.domain.channel.exception.ChannelSubjectOverLengthException;
 import com.sprint.mission.discodeit.domain.user.User;
@@ -25,20 +26,34 @@ public class Channel implements Serializable {
     private final Instant createdAt;
     private Instant updatedAt;
     private final User manager;
+    private final ChannelVisibility visibility;
+    private final ParticipatedUser participatedUser;
+
 
     public Channel(
             String name,
             ChannelType type,
-            User manager
+            User manager,
+            ChannelVisibility visibility
     ) {
         validate(name);
         this.id = UUID.randomUUID();
         this.name = name;
         this.subject = "";
         this.type = type;
+        this.visibility = visibility;
         createdAt = Instant.now();
         updatedAt = Instant.now();
         this.manager = manager;
+        participatedUser = new ParticipatedUser();
+    }
+
+    public static Channel ofPrivateChannel(User manager, ChannelType type) {
+        return new Channel("", type, manager, ChannelVisibility.PRIVATE);
+    }
+
+    public void join(User user) {
+        participatedUser.addUser(user);
     }
 
     public void updateSubject(String subject) {
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/ParticipatedUser.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/ParticipatedUser.java
new file mode 100644
index 000000000..70a62ff11
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/ParticipatedUser.java
@@ -0,0 +1,15 @@
+package com.sprint.mission.discodeit.domain.channel;
+
+import com.sprint.mission.discodeit.domain.user.User;
+import java.util.ArrayList;
+import java.util.List;
+
+public class ParticipatedUser {
+
+    private final List<User> users = new ArrayList<>();
+
+    public void addUser(User user) {
+        users.add(user);
+    }
+
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/enums/ChannelVisibility.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/enums/ChannelVisibility.java
new file mode 100644
index 000000000..ba1034095
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/enums/ChannelVisibility.java
@@ -0,0 +1,6 @@
+package com.sprint.mission.discodeit.domain.channel.enums;
+
+public enum ChannelVisibility {
+    PUBLIC,
+    PRIVATE,
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorResponse.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorResponse.java
new file mode 100644
index 000000000..4b52875a9
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorResponse.java
@@ -0,0 +1,44 @@
+package com.sprint.mission.discodeit.global.error;
+
+import com.sprint.mission.discodeit.global.error.exception.BusinessException;
+import java.util.ArrayList;
+import java.util.List;
+
+public class ErrorResponse {
+
+    private String description;
+    private int status;
+    private List<FieldError> fieldErrors;
+
+    protected ErrorResponse() {
+    }
+
+    public ErrorResponse(String description, int status) {
+        this.description = description;
+        this.status = status;
+        fieldErrors = new ArrayList<>();
+    }
+
+    public ErrorResponse(BusinessException businessException) {
+        this.description = businessException.getErrorCode().getDescription();
+        this.status = businessException.getErrorCode().getStatus();
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public int getStatus() {
+        return status;
+    }
+
+    public List<FieldError> getFieldErrors() {
+        return fieldErrors;
+    }
+
+    public static class FieldError {
+        private String field;
+        private String value;
+        private String reason;
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/GlobalException.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/GlobalException.java
new file mode 100644
index 000000000..ad7c110aa
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/GlobalException.java
@@ -0,0 +1,39 @@
+package com.sprint.mission.discodeit.global.error;
+
+import com.sprint.mission.discodeit.global.error.exception.EntityNotFoundException;
+import com.sprint.mission.discodeit.global.error.exception.InvalidException;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.MethodArgumentNotValidException;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+@RestControllerAdvice
+public class GlobalException {
+
+    @ExceptionHandler(MethodArgumentNotValidException.class)
+    protected ResponseEntity<ErrorResponse> handleMethodArgumentNotValidException(
+            MethodArgumentNotValidException exception) {
+        ErrorResponse errorResponse = new ErrorResponse();
+        return ResponseEntity.badRequest().body(errorResponse);
+    }
+
+    @ExceptionHandler(InvalidException.class)
+    protected ResponseEntity<ErrorResponse> handleInvalidException(InvalidException exception) {
+        ErrorResponse errorResponse = new ErrorResponse(exception.getErrorCode().getDescription(),
+                exception.getErrorCode().getStatus());
+        return ResponseEntity.badRequest().body(errorResponse);
+    }
+
+    @ExceptionHandler(EntityNotFoundException.class)
+    protected ResponseEntity<ErrorResponse> handleEntityNotFoundException(EntityNotFoundException exception) {
+        ErrorResponse errorResponse = new ErrorResponse(exception.getErrorCode().getDescription(),
+                exception.getErrorCode().getStatus());
+        return ResponseEntity.status(404).body(errorResponse);
+    }
+
+    @ExceptionHandler(Exception.class)
+    protected ResponseEntity<ErrorResponse> handleException(Exception exception) {
+        ErrorResponse errorResponse = new ErrorResponse();
+        return ResponseEntity.internalServerError().body(errorResponse);
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/exception/BusinessException.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/exception/BusinessException.java
index cfe26b86e..917cf9764 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/exception/BusinessException.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/exception/BusinessException.java
@@ -17,4 +17,8 @@ public BusinessException(ErrorCode errorCode, String message) {
         super(errorCode.getDescription().concat(" 입력값 = ").concat(message));
         this.errorCode = errorCode;
     }
+
+    public ErrorCode getErrorCode() {
+        return errorCode;
+    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/FileUserRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/FileUserRepository.java
index 8ef29fb52..afb705e9c 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/FileUserRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/FileUserRepository.java
@@ -4,6 +4,7 @@
 import com.sprint.mission.discodeit.domain.user.User;
 import com.sprint.mission.discodeit.domain.user.Username;
 import com.sprint.mission.discodeit.repository.user.interfaces.UserRepository;
+import java.util.List;
 import java.util.Optional;
 import java.util.UUID;
 
@@ -24,6 +25,11 @@ public Optional<User> findOneByEmail(Email email) {
         return Optional.empty();
     }
 
+    @Override
+    public List<User> findAll() {
+        return List.of();
+    }
+
     @Override
     public boolean isExistByEmail(Email email) {
         return false;
@@ -33,4 +39,9 @@ public boolean isExistByEmail(Email email) {
     public boolean isExistByUsername(Username username) {
         return false;
     }
+
+    @Override
+    public void deleteByUser(User user) {
+
+    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/InMemoryUserRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/InMemoryUserRepository.java
index 07d426bef..5c8068029 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/InMemoryUserRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/InMemoryUserRepository.java
@@ -5,6 +5,7 @@
 import com.sprint.mission.discodeit.domain.user.Username;
 import com.sprint.mission.discodeit.repository.user.interfaces.UserRepository;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 import java.util.Optional;
 import java.util.UUID;
@@ -35,6 +36,11 @@ public Optional<User> findOneByEmail(Email email) {
         return Optional.ofNullable(emailUsers.get(email));
     }
 
+    @Override
+    public List<User> findAll() {
+        return uuidUsers.values().stream().toList();
+    }
+
     @Override
     public boolean isExistByEmail(Email email) {
         return emailUsers.containsKey(email);
@@ -44,4 +50,11 @@ public boolean isExistByEmail(Email email) {
     public boolean isExistByUsername(Username username) {
         return usernameUsers.containsKey(username);
     }
+
+    @Override
+    public void deleteByUser(User user) {
+        uuidUsers.remove(user.getId());
+        emailUsers.remove(user.getEmail());
+        usernameUsers.remove(user.getUsername());
+    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/interfaces/UserRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/interfaces/UserRepository.java
index 3b32b09d1..d7cc2dcc4 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/interfaces/UserRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/interfaces/UserRepository.java
@@ -3,6 +3,7 @@
 import com.sprint.mission.discodeit.domain.user.Email;
 import com.sprint.mission.discodeit.domain.user.User;
 import com.sprint.mission.discodeit.domain.user.Username;
+import java.util.List;
 import java.util.Optional;
 import java.util.UUID;
 
@@ -14,7 +15,11 @@ public interface UserRepository {
 
     Optional<User> findOneByEmail(Email email);
 
+    List<User> findAll();
+
     boolean isExistByEmail(Email email);
 
     boolean isExistByUsername(Username username);
+
+    void deleteByUser(User user);
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/userstatus/UserStatusInMemoryRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/userstatus/UserStatusInMemoryRepository.java
index 4f9e72b9e..3baf86c5a 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/userstatus/UserStatusInMemoryRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/userstatus/UserStatusInMemoryRepository.java
@@ -6,7 +6,9 @@
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Optional;
+import org.springframework.stereotype.Repository;
 
+@Repository
 public class UserStatusInMemoryRepository implements UserStatusRepository {
 
     private final Map<User, UserStatus> userStatuses = new HashMap<>();
@@ -22,4 +24,9 @@ public UserStatus save(UserStatus userStatus) {
     public Optional<UserStatus> findByUser(User user) {
         return Optional.ofNullable(userStatuses.get(user));
     }
+
+    @Override
+    public void deleteByUser(User user) {
+        userStatuses.remove(user);
+    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/userstatus/interfaces/UserStatusRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/userstatus/interfaces/UserStatusRepository.java
index d66ef1b09..faf046735 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/userstatus/interfaces/UserStatusRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/userstatus/interfaces/UserStatusRepository.java
@@ -9,4 +9,6 @@ public interface UserStatusRepository {
     UserStatus save(UserStatus userStatus);
 
     Optional<UserStatus> findByUser(User user);
+
+    void deleteByUser(User user);
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/repository/FakeUserRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/repository/FakeUserRepository.java
index c0e18306f..5f385f02c 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/repository/FakeUserRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/repository/FakeUserRepository.java
@@ -5,6 +5,7 @@
 import com.sprint.mission.discodeit.domain.user.Username;
 import com.sprint.mission.discodeit.repository.user.interfaces.UserRepository;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 import java.util.Optional;
 import java.util.UUID;
@@ -33,6 +34,11 @@ public Optional<User> findOneByEmail(Email email) {
         return Optional.ofNullable(emailUsers.get(email));
     }
 
+    @Override
+    public List<User> findAll() {
+        return uuidUsers.values().stream().toList();
+    }
+
     @Override
     public boolean isExistByEmail(Email email) {
         return emailUsers.containsKey(email);
@@ -42,4 +48,11 @@ public boolean isExistByEmail(Email email) {
     public boolean isExistByUsername(Username username) {
         return usernameUsers.containsKey(username);
     }
+
+    @Override
+    public void deleteByUser(User user) {
+        uuidUsers.remove(user.getId());
+        emailUsers.remove(user.getEmail());
+        usernameUsers.remove(user.getUsername());
+    }
 }

From f27e819ae17232110c114c29535a1759fd0404a1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?=
 <157946706+jaewoo9797@users.noreply.github.com>
Date: Tue, 11 Feb 2025 11:55:04 +0900
Subject: [PATCH 27/38] =?UTF-8?q?feat:=20channel=20=EC=A1=B0=ED=9A=8C=20?=
 =?UTF-8?q?=EA=B8=B0=EB=8A=A5=20=EA=B5=AC=ED=98=84?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../mission/discodeit/JavaApplication.java    | 11 +------
 ...Dto.java => ChannelCreateResponseDto.java} |  6 ++--
 .../dto/channel/FoundChannelResponseDto.java  | 22 +++++++++++++
 .../service/channel/JCFChannelService.java    | 31 ++++++++++++++-----
 .../service/interfaces/ChannelService.java    |  9 ++++--
 .../service/interfaces/MessageService.java    |  3 ++
 .../service/message/JCFMessageService.java    |  6 ++++
 .../service/userstatus/UserStatusService.java | 17 +++-------
 .../discodeit/config/ChannelFactory.java      | 10 ++++--
 .../mission/discodeit/config/UserFactory.java | 14 +++++++--
 .../discodeit/domain/channel/Channel.java     | 12 +++++--
 .../domain/channel/ParticipatedUser.java      | 14 ++++++---
 12 files changed, 109 insertions(+), 46 deletions(-)
 rename codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/{ChannelResponseDto.java => ChannelCreateResponseDto.java} (72%)
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/FoundChannelResponseDto.java

diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/JavaApplication.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/JavaApplication.java
index 31ed5e30b..a18709bd9 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/JavaApplication.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/JavaApplication.java
@@ -1,17 +1,8 @@
 package com.sprint.mission.discodeit;
 
-import com.sprint.mission.discodeit.application.service.interfaces.ChannelService;
-import com.sprint.mission.discodeit.application.service.interfaces.MessageService;
-import com.sprint.mission.discodeit.application.service.interfaces.UserService;
-import com.sprint.mission.discodeit.config.ChannelFactory;
-import com.sprint.mission.discodeit.config.MessageFactory;
-import com.sprint.mission.discodeit.config.UserFactory;
-
 public class JavaApplication {
 
     public static void main(String[] args) {
-        UserService userService = UserFactory.getUserService();
-        ChannelService channelService = ChannelFactory.getChannelService();
-        MessageService messageService = MessageFactory.getMessageService();
+
     }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/ChannelResponseDto.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/ChannelCreateResponseDto.java
similarity index 72%
rename from codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/ChannelResponseDto.java
rename to codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/ChannelCreateResponseDto.java
index 2aafb3304..5737d0c49 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/ChannelResponseDto.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/ChannelCreateResponseDto.java
@@ -3,15 +3,15 @@
 import com.sprint.mission.discodeit.domain.channel.Channel;
 import java.util.UUID;
 
-public record ChannelResponseDto(
+public record ChannelCreateResponseDto(
         UUID channelId,
         String name,
         String subject,
         String channelType
 ) {
 
-    public static ChannelResponseDto from(Channel channel) {
-        return new ChannelResponseDto(
+    public static ChannelCreateResponseDto from(Channel channel) {
+        return new ChannelCreateResponseDto(
                 channel.getId(),
                 channel.getName(),
                 channel.getSubject(),
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/FoundChannelResponseDto.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/FoundChannelResponseDto.java
new file mode 100644
index 000000000..ef8eea9ac
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/FoundChannelResponseDto.java
@@ -0,0 +1,22 @@
+package com.sprint.mission.discodeit.application.dto.channel;
+
+import com.sprint.mission.discodeit.domain.channel.Channel;
+import java.time.LocalDateTime;
+import java.util.Set;
+import java.util.UUID;
+
+public record FoundChannelResponseDto(
+        UUID channelId,
+        String channelName,
+        LocalDateTime lastMessageTime,
+        Set<UUID> participatedUserId
+) {
+    public static FoundChannelResponseDto ofPublicChannel(Channel channel, LocalDateTime lastMessageTime) {
+        return new FoundChannelResponseDto(channel.getId(), channel.getName(), lastMessageTime, Set.of());
+    }
+
+    public static FoundChannelResponseDto ofPrivateChannel(Channel channel, LocalDateTime lastMessageTime) {
+        return new FoundChannelResponseDto(channel.getId(), channel.getName(), lastMessageTime,
+                channel.getParticipantUserId());
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java
index b07e6e983..f5ba9eaea 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java
@@ -2,11 +2,13 @@
 
 import com.sprint.mission.discodeit.application.dto.channel.ChangeChannelNameRequestDto;
 import com.sprint.mission.discodeit.application.dto.channel.ChangeChannelSubjectRequestDto;
-import com.sprint.mission.discodeit.application.dto.channel.ChannelResponseDto;
+import com.sprint.mission.discodeit.application.dto.channel.ChannelCreateResponseDto;
 import com.sprint.mission.discodeit.application.dto.channel.CreateChannelRequestDto;
 import com.sprint.mission.discodeit.application.dto.channel.DeleteChannelRequestDto;
 import com.sprint.mission.discodeit.application.dto.channel.InviteChannelRequestDto;
+import com.sprint.mission.discodeit.application.dto.channel.FoundChannelResponseDto;
 import com.sprint.mission.discodeit.application.service.interfaces.ChannelService;
+import com.sprint.mission.discodeit.application.service.interfaces.MessageService;
 import com.sprint.mission.discodeit.application.service.interfaces.UserService;
 import com.sprint.mission.discodeit.domain.channel.Channel;
 import com.sprint.mission.discodeit.domain.channel.enums.ChannelType;
@@ -17,6 +19,7 @@
 import com.sprint.mission.discodeit.global.error.ErrorCode;
 import com.sprint.mission.discodeit.repository.channel.interfaces.ChannelRepository;
 import com.sprint.mission.discodeit.repository.readstatus.interfaces.ReadStatusRepository;
+import java.time.LocalDateTime;
 import java.util.UUID;
 
 public class JCFChannelService implements ChannelService {
@@ -24,35 +27,37 @@ public class JCFChannelService implements ChannelService {
     private final ChannelRepository channelRepository;
     private final UserService userService;
     private final ReadStatusRepository readStatusRepository;
+    private final MessageService messageService;
 
     public JCFChannelService(
             ChannelRepository channelRepository,
             UserService userService,
-            ReadStatusRepository readStatusService
+            ReadStatusRepository readStatusService,
+            MessageService messageService
     ) {
         this.channelRepository = channelRepository;
         this.userService = userService;
         this.readStatusRepository = readStatusService;
+        this.messageService = messageService;
     }
 
     @Override
-    public ChannelResponseDto createPublicChannel(UUID userId, CreateChannelRequestDto requestDto) {
+    public ChannelCreateResponseDto createPublicChannel(UUID userId, CreateChannelRequestDto requestDto) {
         User foundUser = userService.findOneByIdOrThrow(userId);
-        // TODO 예외 발생할 수 있음 -> Request에 이넘타입에 존재하지 않을 경우
         ChannelType channelType = requestDto.channelType();
         Channel createChannel = new Channel(requestDto.name(), channelType, foundUser, ChannelVisibility.PUBLIC);
         Channel savedChannel = channelRepository.save(createChannel);
-        return ChannelResponseDto.from(savedChannel);
+        return ChannelCreateResponseDto.from(savedChannel);
     }
 
     @Override
-    public ChannelResponseDto createPrivateChannel(UUID userId) {
+    public ChannelCreateResponseDto createPrivateChannel(UUID userId) {
         User foundUser = userService.findOneByIdOrThrow(userId);
         Channel createChannel = Channel.ofPrivateChannel(foundUser, ChannelType.TEXT);
         Channel savedChannel = channelRepository.save(createChannel);
         ReadStatus readStatus = new ReadStatus(foundUser, savedChannel);
         readStatusRepository.save(readStatus);
-        return ChannelResponseDto.from(savedChannel);
+        return ChannelCreateResponseDto.from(savedChannel);
     }
 
     @Override
@@ -73,6 +78,18 @@ public void joinPrivateChannel(UUID invitedUserId, InviteChannelRequestDto reque
         channelRepository.save(foundChannel);
     }
 
+    @Override
+    public FoundChannelResponseDto findOneByChannelId(UUID channelId) {
+        Channel foundChannel = findOneByIdOrThrow(channelId);
+        LocalDateTime lastMessageTime = messageService.getLastMessageTime(foundChannel.getId());
+        if (foundChannel.isPublic()) {
+            return FoundChannelResponseDto.ofPublicChannel(foundChannel, lastMessageTime);
+        }
+        else {
+            return FoundChannelResponseDto.ofPrivateChannel(foundChannel, lastMessageTime);
+        }
+    }
+
     @Override
     public Channel findOneByIdOrThrow(UUID id) {
         return channelRepository.findOneById(id)
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/ChannelService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/ChannelService.java
index 14dd7d728..a67d53b28 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/ChannelService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/ChannelService.java
@@ -2,23 +2,26 @@
 
 import com.sprint.mission.discodeit.application.dto.channel.ChangeChannelNameRequestDto;
 import com.sprint.mission.discodeit.application.dto.channel.ChangeChannelSubjectRequestDto;
-import com.sprint.mission.discodeit.application.dto.channel.ChannelResponseDto;
+import com.sprint.mission.discodeit.application.dto.channel.ChannelCreateResponseDto;
 import com.sprint.mission.discodeit.application.dto.channel.CreateChannelRequestDto;
 import com.sprint.mission.discodeit.application.dto.channel.DeleteChannelRequestDto;
+import com.sprint.mission.discodeit.application.dto.channel.FoundChannelResponseDto;
 import com.sprint.mission.discodeit.application.dto.channel.InviteChannelRequestDto;
 import com.sprint.mission.discodeit.domain.channel.Channel;
 import java.util.UUID;
 
 public interface ChannelService {
 
-    ChannelResponseDto createPublicChannel(UUID userId, CreateChannelRequestDto requestDto);
+    ChannelCreateResponseDto createPublicChannel(UUID userId, CreateChannelRequestDto requestDto);
 
-    ChannelResponseDto createPrivateChannel(UUID userId);
+    ChannelCreateResponseDto createPrivateChannel(UUID userId);
 
     void joinPublicChannel(UUID invitedUserId, InviteChannelRequestDto requestDto);
 
     void joinPrivateChannel(UUID invitedUserId, InviteChannelRequestDto requestDto);
 
+    FoundChannelResponseDto findOneByChannelId(UUID channelId);
+
     Channel findOneByIdOrThrow(UUID uuid);
 
     void changeSubject(UUID userId, ChangeChannelSubjectRequestDto requestDto);
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/MessageService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/MessageService.java
index 49574fa84..ce4e9bf46 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/MessageService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/MessageService.java
@@ -5,6 +5,7 @@
 import com.sprint.mission.discodeit.application.dto.message.MessageResponseDto;
 import com.sprint.mission.discodeit.application.dto.message.UpdateMessageContentRequestDto;
 import com.sprint.mission.discodeit.domain.message.Message;
+import java.time.LocalDateTime;
 import java.util.UUID;
 
 public interface MessageService {
@@ -16,4 +17,6 @@ public interface MessageService {
     void deleteMessage(UUID userId, DeleteMessageRequestDto requestDto);
 
     Message findOneByIdOrThrow(UUID uuid);
+
+    LocalDateTime getLastMessageTime(UUID channelId);
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/JCFMessageService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/JCFMessageService.java
index 0bd4514b9..69431df74 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/JCFMessageService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/JCFMessageService.java
@@ -13,6 +13,7 @@
 import com.sprint.mission.discodeit.domain.user.User;
 import com.sprint.mission.discodeit.global.error.ErrorCode;
 import com.sprint.mission.discodeit.repository.message.interfaces.MessageRepository;
+import java.time.LocalDateTime;
 import java.util.UUID;
 
 public class JCFMessageService implements MessageService {
@@ -62,6 +63,11 @@ public Message findOneByIdOrThrow(UUID messageId) {
                 .orElseThrow(() -> new MessageNotFoundException(ErrorCode.NOT_FOUND));
     }
 
+    @Override
+    public LocalDateTime getLastMessageTime(UUID channelId) {
+        return null;
+    }
+
     private void throwIsNotSender(User foundUser, Message foundMessage) {
         if (!foundMessage.isSender(foundUser)) {
             throw new IllegalArgumentException();
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/userstatus/UserStatusService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/userstatus/UserStatusService.java
index 9ae4e28a9..fd027d44f 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/userstatus/UserStatusService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/userstatus/UserStatusService.java
@@ -1,25 +1,20 @@
 package com.sprint.mission.discodeit.application.service.userstatus;
 
-import com.sprint.mission.discodeit.application.service.interfaces.UserService;
 import com.sprint.mission.discodeit.domain.user.User;
 import com.sprint.mission.discodeit.domain.userstatus.UserStatus;
 import com.sprint.mission.discodeit.domain.userstatus.enums.OnlineStatus;
 import com.sprint.mission.discodeit.repository.userstatus.interfaces.UserStatusRepository;
-import java.util.UUID;
 import org.springframework.stereotype.Service;
 
 @Service
 public class UserStatusService {
 
     private final UserStatusRepository userStatusRepository;
-    private final UserService userService;
 
     public UserStatusService(
-            UserStatusRepository userStatusRepository,
-            UserService userService
+            UserStatusRepository userStatusRepository
     ) {
         this.userStatusRepository = userStatusRepository;
-        this.userService = userService;
     }
 
     public UserStatus createAtFirstJoin(User user) {
@@ -30,16 +25,14 @@ public UserStatus findOneByUser(User user) {
         return userStatusRepository.findByUser(user).orElse(new UserStatus(user));
     }
 
-    public void updateLastAccessTime(UUID userId) {
-        User foundUser = userService.findOneByIdOrThrow(userId);
-        UserStatus foundUserStatus = findOneByUser(foundUser);
+    public void updateLastAccessTime(User user) {
+        UserStatus foundUserStatus = findOneByUser(user);
         foundUserStatus.updateLastAccessedAt();
         userStatusRepository.save(foundUserStatus);
     }
 
-    public OnlineStatus getUserOlineStatus(UUID userId) {
-        User foundUser = userService.findOneByIdOrThrow(userId);
-        UserStatus foundUserStatus = findOneByUser(foundUser);
+    public OnlineStatus getUserOlineStatus(User user) {
+        UserStatus foundUserStatus = findOneByUser(user);
         return foundUserStatus.getOnlineStatus();
     }
 
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/ChannelFactory.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/ChannelFactory.java
index b7df9f9ab..b187db029 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/ChannelFactory.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/ChannelFactory.java
@@ -4,7 +4,7 @@
 import com.sprint.mission.discodeit.application.service.interfaces.ChannelService;
 import com.sprint.mission.discodeit.repository.channel.InMemoryChannelRepository;
 import com.sprint.mission.discodeit.repository.channel.interfaces.ChannelRepository;
-import java.io.FileInputStream;
+import com.sprint.mission.discodeit.repository.readstatus.ReadStatusInMemoryRepository;
 import java.io.IOException;
 import java.io.InputStream;
 import java.util.Properties;
@@ -12,7 +12,13 @@
 public class ChannelFactory {
 
     private static final ChannelRepository CHANNEL_REPOSITORY = createChannelRepository();
-    private static final ChannelService CHANNEL_SERVICE = new JCFChannelService(CHANNEL_REPOSITORY, UserFactory.getUserService());
+    private static final ChannelService CHANNEL_SERVICE =
+            new JCFChannelService(
+                    CHANNEL_REPOSITORY,
+                    UserFactory.getUserService(),
+                    new ReadStatusInMemoryRepository(),
+                    MessageFactory.getMessageService()
+            );
 
     public static ChannelService getChannelService() {
         return CHANNEL_SERVICE;
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/UserFactory.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/UserFactory.java
index 88458468e..cbbe58db9 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/UserFactory.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/UserFactory.java
@@ -4,9 +4,11 @@
 import com.sprint.mission.discodeit.application.service.interfaces.UserService;
 import com.sprint.mission.discodeit.application.service.user.JCFUserService;
 import com.sprint.mission.discodeit.application.service.user.converter.UserConverter;
+import com.sprint.mission.discodeit.application.service.userstatus.UserStatusService;
 import com.sprint.mission.discodeit.repository.user.InMemoryUserRepository;
 import com.sprint.mission.discodeit.repository.user.interfaces.UserRepository;
-import java.io.FileInputStream;
+import com.sprint.mission.discodeit.repository.userstatus.UserStatusInMemoryRepository;
+import com.sprint.mission.discodeit.repository.userstatus.interfaces.UserStatusRepository;
 import java.io.IOException;
 import java.io.InputStream;
 import java.util.Properties;
@@ -14,7 +16,13 @@
 public class UserFactory {
 
     private static final UserRepository USER_REPOSITORY = createUserRepository();
-    private static final UserService USER_SERVICE = new JCFUserService(USER_REPOSITORY, new UserConverter(), new PasswordEncoder());
+    private static final UserService USER_SERVICE =
+            new JCFUserService(
+                    USER_REPOSITORY,
+                    new UserConverter(),
+                    new PasswordEncoder(),
+                    new UserStatusService(new UserStatusInMemoryRepository())
+            );
 
     public static UserService getUserService() {
         return USER_SERVICE;
@@ -29,7 +37,7 @@ public static UserRepository createUserRepository() {
         }
         String repositoryType = properties.getProperty("repository.type", "memory");
 
-        return switch(repositoryType) {
+        return switch (repositoryType) {
             default -> new InMemoryUserRepository();
         };
     }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java
index 600fe922b..c4fdd4630 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java
@@ -9,8 +9,8 @@
 import java.io.Serial;
 import java.io.Serializable;
 import java.time.Instant;
-import java.time.LocalDateTime;
 import java.util.Objects;
+import java.util.Set;
 import java.util.UUID;
 
 public class Channel implements Serializable {
@@ -29,7 +29,6 @@ public class Channel implements Serializable {
     private final ChannelVisibility visibility;
     private final ParticipatedUser participatedUser;
 
-
     public Channel(
             String name,
             ChannelType type,
@@ -78,6 +77,14 @@ public boolean isManager(User user) {
         return this.manager.equals(user);
     }
 
+    public boolean isPublic() {
+        return this.visibility == ChannelVisibility.PUBLIC;
+    }
+
+    public Set<UUID> getParticipantUserId() {
+        return this.participatedUser.getParticipatedUserId();
+    }
+
     public UUID getId() {
         return id;
     }
@@ -94,6 +101,7 @@ public String getType() {
         return type.toString();
     }
 
+
     @Override
     public boolean equals(Object o) {
         if (this == o) {
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/ParticipatedUser.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/ParticipatedUser.java
index 70a62ff11..1c7a7bd99 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/ParticipatedUser.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/ParticipatedUser.java
@@ -1,15 +1,21 @@
 package com.sprint.mission.discodeit.domain.channel;
 
 import com.sprint.mission.discodeit.domain.user.User;
-import java.util.ArrayList;
-import java.util.List;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Set;
+import java.util.UUID;
 
 public class ParticipatedUser {
 
-    private final List<User> users = new ArrayList<>();
+    private final Map<UUID, User> users = new HashMap<>();
 
     public void addUser(User user) {
-        users.add(user);
+        users.put(user.getId(), user);
     }
 
+    public Set<UUID> getParticipatedUserId() {
+        return Collections.unmodifiableSet(users.keySet());
+    }
 }

From f809a2470e03b3346e9d5c6f9b6970651a9bdca3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?=
 <157946706+jaewoo9797@users.noreply.github.com>
Date: Tue, 11 Feb 2025 13:46:52 +0900
Subject: [PATCH 28/38] =?UTF-8?q?feat:=20channel=20=EA=B8=B0=EB=8A=A5=20?=
 =?UTF-8?q?=EA=B3=A0=EB=8F=84=ED=99=94=20=EA=B5=AC=ED=98=84?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../service/channel/JCFChannelService.java    | 36 ++++++++++++-------
 .../service/interfaces/MessageService.java    |  2 --
 .../service/message/JCFMessageService.java    |  5 ---
 .../discodeit/config/ChannelFactory.java      |  3 +-
 .../channel/FileChannelRepository.java        |  6 ++++
 .../channel/InMemoryChannelRepository.java    |  6 ++++
 .../channel/interfaces/ChannelRepository.java |  3 ++
 .../message/FileMessageRepository.java        | 12 +++++++
 .../message/InMemoryMessageRepository.java    | 12 +++++++
 .../message/interfaces/MessageRepository.java |  6 ++++
 .../ReadStatusInMemoryRepository.java         | 21 ++++++++---
 .../interfaces/ReadStatusRepository.java      |  2 ++
 .../mission/discodeit/fake/FakeFactory.java   |  9 ++++-
 13 files changed, 97 insertions(+), 26 deletions(-)

diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java
index f5ba9eaea..8b02bd7c9 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java
@@ -5,10 +5,9 @@
 import com.sprint.mission.discodeit.application.dto.channel.ChannelCreateResponseDto;
 import com.sprint.mission.discodeit.application.dto.channel.CreateChannelRequestDto;
 import com.sprint.mission.discodeit.application.dto.channel.DeleteChannelRequestDto;
-import com.sprint.mission.discodeit.application.dto.channel.InviteChannelRequestDto;
 import com.sprint.mission.discodeit.application.dto.channel.FoundChannelResponseDto;
+import com.sprint.mission.discodeit.application.dto.channel.InviteChannelRequestDto;
 import com.sprint.mission.discodeit.application.service.interfaces.ChannelService;
-import com.sprint.mission.discodeit.application.service.interfaces.MessageService;
 import com.sprint.mission.discodeit.application.service.interfaces.UserService;
 import com.sprint.mission.discodeit.domain.channel.Channel;
 import com.sprint.mission.discodeit.domain.channel.enums.ChannelType;
@@ -18,8 +17,10 @@
 import com.sprint.mission.discodeit.domain.user.User;
 import com.sprint.mission.discodeit.global.error.ErrorCode;
 import com.sprint.mission.discodeit.repository.channel.interfaces.ChannelRepository;
+import com.sprint.mission.discodeit.repository.message.interfaces.MessageRepository;
 import com.sprint.mission.discodeit.repository.readstatus.interfaces.ReadStatusRepository;
 import java.time.LocalDateTime;
+import java.util.List;
 import java.util.UUID;
 
 public class JCFChannelService implements ChannelService {
@@ -27,18 +28,18 @@ public class JCFChannelService implements ChannelService {
     private final ChannelRepository channelRepository;
     private final UserService userService;
     private final ReadStatusRepository readStatusRepository;
-    private final MessageService messageService;
+    private final MessageRepository messageRepository;
 
     public JCFChannelService(
             ChannelRepository channelRepository,
             UserService userService,
             ReadStatusRepository readStatusService,
-            MessageService messageService
+            MessageRepository messageRepository
     ) {
         this.channelRepository = channelRepository;
         this.userService = userService;
         this.readStatusRepository = readStatusService;
-        this.messageService = messageService;
+        this.messageRepository = messageRepository;
     }
 
     @Override
@@ -81,13 +82,13 @@ public void joinPrivateChannel(UUID invitedUserId, InviteChannelRequestDto reque
     @Override
     public FoundChannelResponseDto findOneByChannelId(UUID channelId) {
         Channel foundChannel = findOneByIdOrThrow(channelId);
-        LocalDateTime lastMessageTime = messageService.getLastMessageTime(foundChannel.getId());
-        if (foundChannel.isPublic()) {
-            return FoundChannelResponseDto.ofPublicChannel(foundChannel, lastMessageTime);
-        }
-        else {
-            return FoundChannelResponseDto.ofPrivateChannel(foundChannel, lastMessageTime);
-        }
+        return toFoundChannelResponseDto(foundChannel);
+    }
+
+    public List<FoundChannelResponseDto> findAllByChannelId(UUID userId) {
+        List<Channel> channels = channelRepository.findAllByUserId(userId);
+        // 채널 한 개당 메세지를 조회해오는 N + 1
+        return channels.stream().map(this::toFoundChannelResponseDto).toList();
     }
 
     @Override
@@ -119,6 +120,8 @@ public void deleteChannel(UUID userId, DeleteChannelRequestDto requestDto) {
         User foundUser = userService.findOneByIdOrThrow(userId);
         Channel foundChannel = findOneByIdOrThrow(requestDto.channelId());
         throwIsNotManager(foundUser, foundChannel);
+        readStatusRepository.deleteByChannel(foundChannel);
+        messageRepository.deleteByChannel(foundChannel);
         channelRepository.deleteById(foundChannel.getId());
     }
 
@@ -127,4 +130,13 @@ private void throwIsNotManager(User foundUser, Channel foundChannel) {
             throw new IllegalArgumentException();
         }
     }
+
+    private FoundChannelResponseDto toFoundChannelResponseDto(Channel foundChannel) {
+        LocalDateTime lastMessageTime = messageRepository.getLastMessageTimeByChannelId(foundChannel.getId());
+        if (foundChannel.isPublic()) {
+            return FoundChannelResponseDto.ofPublicChannel(foundChannel, lastMessageTime);
+        } else {
+            return FoundChannelResponseDto.ofPrivateChannel(foundChannel, lastMessageTime);
+        }
+    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/MessageService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/MessageService.java
index ce4e9bf46..d1a8b44ec 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/MessageService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/MessageService.java
@@ -5,7 +5,6 @@
 import com.sprint.mission.discodeit.application.dto.message.MessageResponseDto;
 import com.sprint.mission.discodeit.application.dto.message.UpdateMessageContentRequestDto;
 import com.sprint.mission.discodeit.domain.message.Message;
-import java.time.LocalDateTime;
 import java.util.UUID;
 
 public interface MessageService {
@@ -18,5 +17,4 @@ public interface MessageService {
 
     Message findOneByIdOrThrow(UUID uuid);
 
-    LocalDateTime getLastMessageTime(UUID channelId);
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/JCFMessageService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/JCFMessageService.java
index 69431df74..88d2b0c7d 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/JCFMessageService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/JCFMessageService.java
@@ -63,11 +63,6 @@ public Message findOneByIdOrThrow(UUID messageId) {
                 .orElseThrow(() -> new MessageNotFoundException(ErrorCode.NOT_FOUND));
     }
 
-    @Override
-    public LocalDateTime getLastMessageTime(UUID channelId) {
-        return null;
-    }
-
     private void throwIsNotSender(User foundUser, Message foundMessage) {
         if (!foundMessage.isSender(foundUser)) {
             throw new IllegalArgumentException();
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/ChannelFactory.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/ChannelFactory.java
index b187db029..8f7928df0 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/ChannelFactory.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/ChannelFactory.java
@@ -4,6 +4,7 @@
 import com.sprint.mission.discodeit.application.service.interfaces.ChannelService;
 import com.sprint.mission.discodeit.repository.channel.InMemoryChannelRepository;
 import com.sprint.mission.discodeit.repository.channel.interfaces.ChannelRepository;
+import com.sprint.mission.discodeit.repository.message.InMemoryMessageRepository;
 import com.sprint.mission.discodeit.repository.readstatus.ReadStatusInMemoryRepository;
 import java.io.IOException;
 import java.io.InputStream;
@@ -17,7 +18,7 @@ public class ChannelFactory {
                     CHANNEL_REPOSITORY,
                     UserFactory.getUserService(),
                     new ReadStatusInMemoryRepository(),
-                    MessageFactory.getMessageService()
+                    new InMemoryMessageRepository()
             );
 
     public static ChannelService getChannelService() {
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/FileChannelRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/FileChannelRepository.java
index ee79d46f7..c4cc0cd8d 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/FileChannelRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/FileChannelRepository.java
@@ -2,6 +2,7 @@
 
 import com.sprint.mission.discodeit.domain.channel.Channel;
 import com.sprint.mission.discodeit.repository.channel.interfaces.ChannelRepository;
+import java.util.List;
 import java.util.Optional;
 import java.util.UUID;
 
@@ -16,6 +17,11 @@ public Optional<Channel> findOneById(UUID uuid) {
         return Optional.empty();
     }
 
+    @Override
+    public List<Channel> findAllByUserId(UUID userId) {
+        return List.of();
+    }
+
     @Override
     public void deleteById(UUID uuid) {
 
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/InMemoryChannelRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/InMemoryChannelRepository.java
index b133fb177..3bbc44033 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/InMemoryChannelRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/InMemoryChannelRepository.java
@@ -3,6 +3,7 @@
 import com.sprint.mission.discodeit.domain.channel.Channel;
 import com.sprint.mission.discodeit.repository.channel.interfaces.ChannelRepository;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 import java.util.Optional;
 import java.util.UUID;
@@ -22,6 +23,11 @@ public Optional<Channel> findOneById(UUID uuid) {
         return Optional.ofNullable(uuidChannels.get(uuid));
     }
 
+    @Override
+    public List<Channel> findAllByUserId(UUID userId) {
+        return List.of();
+    }
+
     @Override
     public void deleteById(UUID uuid) {
         uuidChannels.remove(uuid);
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/interfaces/ChannelRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/interfaces/ChannelRepository.java
index 767a7f1ee..c27171617 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/interfaces/ChannelRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/interfaces/ChannelRepository.java
@@ -1,6 +1,7 @@
 package com.sprint.mission.discodeit.repository.channel.interfaces;
 
 import com.sprint.mission.discodeit.domain.channel.Channel;
+import java.util.List;
 import java.util.Optional;
 import java.util.UUID;
 
@@ -10,5 +11,7 @@ public interface ChannelRepository {
 
     Optional<Channel> findOneById(UUID uuid);
 
+    List<Channel> findAllByUserId(UUID userId);
+
     void deleteById(UUID uuid);
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/FileMessageRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/FileMessageRepository.java
index 83a328d74..c954da63b 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/FileMessageRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/FileMessageRepository.java
@@ -1,7 +1,9 @@
 package com.sprint.mission.discodeit.repository.message;
 
+import com.sprint.mission.discodeit.domain.channel.Channel;
 import com.sprint.mission.discodeit.domain.message.Message;
 import com.sprint.mission.discodeit.repository.message.interfaces.MessageRepository;
+import java.time.LocalDateTime;
 import java.util.Optional;
 import java.util.UUID;
 
@@ -20,4 +22,14 @@ public Optional<Message> findById(UUID uuid) {
     public void deleteById(UUID uuid) {
 
     }
+
+    @Override
+    public void deleteByChannel(Channel channel) {
+
+    }
+
+    @Override
+    public LocalDateTime getLastMessageTimeByChannelId(UUID channelId) {
+        return null;
+    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/InMemoryMessageRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/InMemoryMessageRepository.java
index 20324e84a..1bf305b08 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/InMemoryMessageRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/InMemoryMessageRepository.java
@@ -1,7 +1,9 @@
 package com.sprint.mission.discodeit.repository.message;
 
+import com.sprint.mission.discodeit.domain.channel.Channel;
 import com.sprint.mission.discodeit.domain.message.Message;
 import com.sprint.mission.discodeit.repository.message.interfaces.MessageRepository;
+import java.time.LocalDateTime;
 import java.util.Optional;
 import java.util.UUID;
 
@@ -20,4 +22,14 @@ public Optional<Message> findById(UUID uuid) {
     public void deleteById(UUID uuid) {
 
     }
+
+    @Override
+    public void deleteByChannel(Channel channel) {
+
+    }
+
+    @Override
+    public LocalDateTime getLastMessageTimeByChannelId(UUID channelId) {
+        return null;
+    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/interfaces/MessageRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/interfaces/MessageRepository.java
index 252d39325..1560b2db9 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/interfaces/MessageRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/interfaces/MessageRepository.java
@@ -1,6 +1,8 @@
 package com.sprint.mission.discodeit.repository.message.interfaces;
 
+import com.sprint.mission.discodeit.domain.channel.Channel;
 import com.sprint.mission.discodeit.domain.message.Message;
+import java.time.LocalDateTime;
 import java.util.Optional;
 import java.util.UUID;
 
@@ -11,4 +13,8 @@ public interface MessageRepository {
     Optional<Message> findById(UUID uuid);
 
     void deleteById(UUID uuid);
+
+    void deleteByChannel(Channel channel);
+
+    LocalDateTime getLastMessageTimeByChannelId(UUID channelId);
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/readstatus/ReadStatusInMemoryRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/readstatus/ReadStatusInMemoryRepository.java
index 41a252029..05622e660 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/readstatus/ReadStatusInMemoryRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/readstatus/ReadStatusInMemoryRepository.java
@@ -16,24 +16,35 @@ public class ReadStatusInMemoryRepository implements ReadStatusRepository {
 
     @Override
     public ReadStatus save(ReadStatus readStatus) {
-        ReadStatusKey readStatusKey = new ReadStatusKey(readStatus.getUser(), readStatus.getChannel());
+        ReadStatusKey readStatusKey = ReadStatusKey.of(readStatus.getUser(), readStatus.getChannel());
         readStatusMap.put(readStatusKey, readStatus);
         return readStatus;
     }
 
     @Override
     public Optional<ReadStatus> findOneByUserIdAndChannelId(User user, Channel channel) {
-        ReadStatusKey readStatusKey = new ReadStatusKey(user, channel);
+        ReadStatusKey readStatusKey = ReadStatusKey.of(user, channel);
         return Optional.ofNullable(readStatusMap.get(readStatusKey));
     }
 
+    @Override
+    public void deleteByChannel(Channel channel) {
+        channel.getParticipantUserId().stream()
+                .map(userId -> new ReadStatusKey(userId, channel.getId()))
+                .forEach(readStatusMap::remove);
+    }
+
     private static class ReadStatusKey {
         private final UUID userId;
         private final UUID channelId;
 
-        public ReadStatusKey(User user, Channel channel) {
-            this.userId = user.getId();
-            this.channelId = channel.getId();
+        public ReadStatusKey(UUID userId, UUID channelId) {
+            this.userId = userId;
+            this.channelId = channelId;
+        }
+
+        public static ReadStatusKey of(User user, Channel channel) {
+            return new ReadStatusKey(user.getId(), channel.getId());
         }
 
         @Override
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/readstatus/interfaces/ReadStatusRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/readstatus/interfaces/ReadStatusRepository.java
index ff07a73ae..909fcb098 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/readstatus/interfaces/ReadStatusRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/readstatus/interfaces/ReadStatusRepository.java
@@ -10,4 +10,6 @@ public interface ReadStatusRepository {
     ReadStatus save(ReadStatus readStatus);
 
     Optional<ReadStatus> findOneByUserIdAndChannelId(User user, Channel channel);
+
+    void deleteByChannel(Channel channel);
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/FakeFactory.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/FakeFactory.java
index d3da490c5..18e324880 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/FakeFactory.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/FakeFactory.java
@@ -3,8 +3,11 @@
 import com.sprint.mission.discodeit.application.auth.PasswordEncoder;
 import com.sprint.mission.discodeit.application.service.user.JCFUserService;
 import com.sprint.mission.discodeit.application.service.user.converter.UserConverter;
+import com.sprint.mission.discodeit.application.service.userstatus.UserStatusService;
 import com.sprint.mission.discodeit.fake.repository.FakeUserRepository;
 import com.sprint.mission.discodeit.repository.user.interfaces.UserRepository;
+import com.sprint.mission.discodeit.repository.userstatus.UserStatusInMemoryRepository;
+import com.sprint.mission.discodeit.repository.userstatus.interfaces.UserStatusRepository;
 
 public class FakeFactory {
     private FakeFactory() {
@@ -15,6 +18,10 @@ public static UserRepository getUserRepository() {
     }
 
     public static JCFUserService getUserService() {
-        return new JCFUserService(getUserRepository(), new UserConverter(), new PasswordEncoder());
+        return new JCFUserService(
+                getUserRepository(),
+                new UserConverter(),
+                new PasswordEncoder(),
+                new UserStatusService(new UserStatusInMemoryRepository()));
     }
 }

From 6a468397bb77f107591038899510cfd7d30ef697 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?=
 <157946706+jaewoo9797@users.noreply.github.com>
Date: Tue, 11 Feb 2025 14:33:34 +0900
Subject: [PATCH 29/38] =?UTF-8?q?feat:=20=EC=B6=94=EA=B0=80=20=EC=9A=94?=
 =?UTF-8?q?=EA=B5=AC=EC=82=AC=ED=95=AD=20=EA=B8=B0=EB=8A=A5=20=EA=B5=AC?=
 =?UTF-8?q?=ED=98=84?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../service/channel/JCFChannelService.java       |  8 ++++++++
 .../service/userstatus/UserStatusService.java    |  3 +++
 .../exception/AlreadyJoinUserException.java      | 11 +++++++++++
 .../discodeit/global/error/ErrorCode.java        |  2 +-
 .../channel/FileChannelRepository.java           |  6 ++++++
 .../channel/InMemoryChannelRepository.java       | 16 ++++++++++++----
 .../channel/interfaces/ChannelRepository.java    |  3 +++
 .../readstatus/ReadStatusInMemoryRepository.java |  8 ++++----
 .../repository/user/InMemoryUserRepository.java  |  2 +-
 .../userstatus/UserStatusInMemoryRepository.java | 11 +++++++++++
 .../interfaces/UserStatusRepository.java         |  5 +++++
 11 files changed, 65 insertions(+), 10 deletions(-)
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/exception/AlreadyJoinUserException.java

diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java
index 8b02bd7c9..5855789ed 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java
@@ -12,6 +12,7 @@
 import com.sprint.mission.discodeit.domain.channel.Channel;
 import com.sprint.mission.discodeit.domain.channel.enums.ChannelType;
 import com.sprint.mission.discodeit.domain.channel.enums.ChannelVisibility;
+import com.sprint.mission.discodeit.domain.channel.exception.AlreadyJoinUserException;
 import com.sprint.mission.discodeit.domain.channel.exception.ChannelNotFoundException;
 import com.sprint.mission.discodeit.domain.readStatus.ReadStatus;
 import com.sprint.mission.discodeit.domain.user.User;
@@ -73,6 +74,7 @@ public void joinPublicChannel(UUID invitedUserId, InviteChannelRequestDto reques
     public void joinPrivateChannel(UUID invitedUserId, InviteChannelRequestDto requestDto) {
         User foundUser = userService.findOneByIdOrThrow(invitedUserId);
         Channel foundChannel = findOneByIdOrThrow(requestDto.channelId());
+        throwIsAlreadyJoinUser(foundUser, foundChannel);
         foundChannel.join(foundUser);
         ReadStatus readStatus = new ReadStatus(foundUser, foundChannel);
         readStatusRepository.save(readStatus);
@@ -139,4 +141,10 @@ private FoundChannelResponseDto toFoundChannelResponseDto(Channel foundChannel)
             return FoundChannelResponseDto.ofPrivateChannel(foundChannel, lastMessageTime);
         }
     }
+
+    private void throwIsAlreadyJoinUser(User targetUser, Channel targetChannel) {
+        if (channelRepository.isExistUser(targetUser, targetChannel)) {
+            throw new AlreadyJoinUserException(ErrorCode.ALREADY_CHANNEL_JOIN_USER, targetUser.getNicknameValue());
+        }
+    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/userstatus/UserStatusService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/userstatus/UserStatusService.java
index fd027d44f..70e0ef0ab 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/userstatus/UserStatusService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/userstatus/UserStatusService.java
@@ -18,6 +18,9 @@ public UserStatusService(
     }
 
     public UserStatus createAtFirstJoin(User user) {
+        if (userStatusRepository.isExistUser(user)) {
+            throw new IllegalArgumentException("userStatus already exist");
+        }
         return userStatusRepository.save(new UserStatus(user));
     }
 
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/exception/AlreadyJoinUserException.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/exception/AlreadyJoinUserException.java
new file mode 100644
index 000000000..91835522d
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/exception/AlreadyJoinUserException.java
@@ -0,0 +1,11 @@
+package com.sprint.mission.discodeit.domain.channel.exception;
+
+import com.sprint.mission.discodeit.global.error.ErrorCode;
+import com.sprint.mission.discodeit.global.error.exception.InvalidException;
+
+public class AlreadyJoinUserException extends InvalidException {
+
+    public AlreadyJoinUserException(ErrorCode errorCode, String message) {
+        super(errorCode, message);
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorCode.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorCode.java
index 9b88e3409..26003aa78 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorCode.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorCode.java
@@ -29,7 +29,7 @@ public enum ErrorCode {
 
     // Channel
     INVALID_CHANNEL_NAME_NOT_NULL(400, "채널 이름은 필수 입력값 입니다."),
-
+    ALREADY_CHANNEL_JOIN_USER(400, "이미 참여한 채널입니다."),
     // Message
     INVALID_MESSAGE_CONTENT_NOT_NULL(400, "메시지 내용은 필수 입력값 입니다."),
     ;
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/FileChannelRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/FileChannelRepository.java
index c4cc0cd8d..8242c22ca 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/FileChannelRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/FileChannelRepository.java
@@ -1,6 +1,7 @@
 package com.sprint.mission.discodeit.repository.channel;
 
 import com.sprint.mission.discodeit.domain.channel.Channel;
+import com.sprint.mission.discodeit.domain.user.User;
 import com.sprint.mission.discodeit.repository.channel.interfaces.ChannelRepository;
 import java.util.List;
 import java.util.Optional;
@@ -26,4 +27,9 @@ public List<Channel> findAllByUserId(UUID userId) {
     public void deleteById(UUID uuid) {
 
     }
+
+    @Override
+    public boolean isExistUser(User user, Channel channel) {
+        return false;
+    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/InMemoryChannelRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/InMemoryChannelRepository.java
index 3bbc44033..8aa30d5fe 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/InMemoryChannelRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/InMemoryChannelRepository.java
@@ -1,26 +1,28 @@
 package com.sprint.mission.discodeit.repository.channel;
 
 import com.sprint.mission.discodeit.domain.channel.Channel;
+import com.sprint.mission.discodeit.domain.user.User;
 import com.sprint.mission.discodeit.repository.channel.interfaces.ChannelRepository;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Optional;
+import java.util.Set;
 import java.util.UUID;
 
 public class InMemoryChannelRepository implements ChannelRepository {
 
-    private final Map<UUID, Channel> uuidChannels = new HashMap<>();
+    private final Map<UUID, Channel> channelUUIDStore = new HashMap<>();
 
     @Override
     public Channel save(Channel channel) {
-        Channel savedChannel = uuidChannels.put(channel.getId(), channel);
+        Channel savedChannel = channelUUIDStore.put(channel.getId(), channel);
         return channel;
     }
 
     @Override
     public Optional<Channel> findOneById(UUID uuid) {
-        return Optional.ofNullable(uuidChannels.get(uuid));
+        return Optional.ofNullable(channelUUIDStore.get(uuid));
     }
 
     @Override
@@ -30,6 +32,12 @@ public List<Channel> findAllByUserId(UUID userId) {
 
     @Override
     public void deleteById(UUID uuid) {
-        uuidChannels.remove(uuid);
+        channelUUIDStore.remove(uuid);
+    }
+
+    @Override
+    public boolean isExistUser(User user, Channel channel) {
+        Set<UUID> participantUserId = channelUUIDStore.get(channel.getId()).getParticipantUserId();
+        return participantUserId.contains(user.getId());
     }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/interfaces/ChannelRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/interfaces/ChannelRepository.java
index c27171617..16df8f06e 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/interfaces/ChannelRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/interfaces/ChannelRepository.java
@@ -1,6 +1,7 @@
 package com.sprint.mission.discodeit.repository.channel.interfaces;
 
 import com.sprint.mission.discodeit.domain.channel.Channel;
+import com.sprint.mission.discodeit.domain.user.User;
 import java.util.List;
 import java.util.Optional;
 import java.util.UUID;
@@ -14,4 +15,6 @@ public interface ChannelRepository {
     List<Channel> findAllByUserId(UUID userId);
 
     void deleteById(UUID uuid);
+
+    boolean isExistUser(User user, Channel channel);
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/readstatus/ReadStatusInMemoryRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/readstatus/ReadStatusInMemoryRepository.java
index 05622e660..2eff1677b 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/readstatus/ReadStatusInMemoryRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/readstatus/ReadStatusInMemoryRepository.java
@@ -12,26 +12,26 @@
 
 public class ReadStatusInMemoryRepository implements ReadStatusRepository {
 
-    private final Map<ReadStatusKey, ReadStatus> readStatusMap = new HashMap<>();
+    private final Map<ReadStatusKey, ReadStatus> readStatusStore = new HashMap<>();
 
     @Override
     public ReadStatus save(ReadStatus readStatus) {
         ReadStatusKey readStatusKey = ReadStatusKey.of(readStatus.getUser(), readStatus.getChannel());
-        readStatusMap.put(readStatusKey, readStatus);
+        readStatusStore.put(readStatusKey, readStatus);
         return readStatus;
     }
 
     @Override
     public Optional<ReadStatus> findOneByUserIdAndChannelId(User user, Channel channel) {
         ReadStatusKey readStatusKey = ReadStatusKey.of(user, channel);
-        return Optional.ofNullable(readStatusMap.get(readStatusKey));
+        return Optional.ofNullable(readStatusStore.get(readStatusKey));
     }
 
     @Override
     public void deleteByChannel(Channel channel) {
         channel.getParticipantUserId().stream()
                 .map(userId -> new ReadStatusKey(userId, channel.getId()))
-                .forEach(readStatusMap::remove);
+                .forEach(readStatusStore::remove);
     }
 
     private static class ReadStatusKey {
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/InMemoryUserRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/InMemoryUserRepository.java
index 5c8068029..54e981a4a 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/InMemoryUserRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/InMemoryUserRepository.java
@@ -38,7 +38,7 @@ public Optional<User> findOneByEmail(Email email) {
 
     @Override
     public List<User> findAll() {
-        return uuidUsers.values().stream().toList();
+        return List.copyOf(uuidUsers.values());
     }
 
     @Override
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/userstatus/UserStatusInMemoryRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/userstatus/UserStatusInMemoryRepository.java
index 3baf86c5a..c2cbf8ba7 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/userstatus/UserStatusInMemoryRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/userstatus/UserStatusInMemoryRepository.java
@@ -4,6 +4,7 @@
 import com.sprint.mission.discodeit.domain.userstatus.UserStatus;
 import com.sprint.mission.discodeit.repository.userstatus.interfaces.UserStatusRepository;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 import java.util.Optional;
 import org.springframework.stereotype.Repository;
@@ -25,8 +26,18 @@ public Optional<UserStatus> findByUser(User user) {
         return Optional.ofNullable(userStatuses.get(user));
     }
 
+    @Override
+    public List<UserStatus> findAll() {
+        return List.copyOf(userStatuses.values());
+    }
+
     @Override
     public void deleteByUser(User user) {
         userStatuses.remove(user);
     }
+
+    @Override
+    public boolean isExistUser(User user) {
+        return userStatuses.containsKey(user);
+    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/userstatus/interfaces/UserStatusRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/userstatus/interfaces/UserStatusRepository.java
index faf046735..168e69d1f 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/userstatus/interfaces/UserStatusRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/userstatus/interfaces/UserStatusRepository.java
@@ -2,6 +2,7 @@
 
 import com.sprint.mission.discodeit.domain.user.User;
 import com.sprint.mission.discodeit.domain.userstatus.UserStatus;
+import java.util.List;
 import java.util.Optional;
 
 public interface UserStatusRepository {
@@ -10,5 +11,9 @@ public interface UserStatusRepository {
 
     Optional<UserStatus> findByUser(User user);
 
+    List<UserStatus> findAll();
+
     void deleteByUser(User user);
+
+    boolean isExistUser(User user);
 }

From 4cf1ba5b938c73de1b9749042423602e797168f4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?=
 <157946706+jaewoo9797@users.noreply.github.com>
Date: Tue, 11 Feb 2025 14:36:29 +0900
Subject: [PATCH 30/38] =?UTF-8?q?refactor:=20application=20=ED=8C=8C?=
 =?UTF-8?q?=EC=9D=BC=20=ED=99=95=EC=9E=A5=EC=9E=90=20=EB=B3=80=EA=B2=BD?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../discodeit/config/ChannelFactory.java      | 41 -----------------
 .../discodeit/config/MessageFactory.java      | 34 --------------
 .../mission/discodeit/config/UserFactory.java | 44 -------------------
 .../src/main/resources/application.properties |  1 -
 .../src/main/resources/application.yaml       |  0
 5 files changed, 120 deletions(-)
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/ChannelFactory.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/MessageFactory.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/UserFactory.java
 delete mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/resources/application.properties
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/resources/application.yaml

diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/ChannelFactory.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/ChannelFactory.java
deleted file mode 100644
index 8f7928df0..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/ChannelFactory.java
+++ /dev/null
@@ -1,41 +0,0 @@
-package com.sprint.mission.discodeit.config;
-
-import com.sprint.mission.discodeit.application.service.channel.JCFChannelService;
-import com.sprint.mission.discodeit.application.service.interfaces.ChannelService;
-import com.sprint.mission.discodeit.repository.channel.InMemoryChannelRepository;
-import com.sprint.mission.discodeit.repository.channel.interfaces.ChannelRepository;
-import com.sprint.mission.discodeit.repository.message.InMemoryMessageRepository;
-import com.sprint.mission.discodeit.repository.readstatus.ReadStatusInMemoryRepository;
-import java.io.IOException;
-import java.io.InputStream;
-import java.util.Properties;
-
-public class ChannelFactory {
-
-    private static final ChannelRepository CHANNEL_REPOSITORY = createChannelRepository();
-    private static final ChannelService CHANNEL_SERVICE =
-            new JCFChannelService(
-                    CHANNEL_REPOSITORY,
-                    UserFactory.getUserService(),
-                    new ReadStatusInMemoryRepository(),
-                    new InMemoryMessageRepository()
-            );
-
-    public static ChannelService getChannelService() {
-        return CHANNEL_SERVICE;
-    }
-
-    public static ChannelRepository createChannelRepository() {
-        Properties properties = new Properties();
-        try (InputStream is = ChannelFactory.class.getClassLoader().getResourceAsStream("application.properties")) {
-            properties.load(is);
-        } catch (IOException exception) {
-            System.out.println("설정 파일 로드 실패, 기본값(memory) 사용");
-        }
-        String repositoryType = properties.getProperty("repository.type", "memory");
-
-        return switch (repositoryType) {
-            default -> new InMemoryChannelRepository();
-        };
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/MessageFactory.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/MessageFactory.java
deleted file mode 100644
index 6c895346e..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/MessageFactory.java
+++ /dev/null
@@ -1,34 +0,0 @@
-package com.sprint.mission.discodeit.config;
-
-import com.sprint.mission.discodeit.application.service.interfaces.MessageService;
-import com.sprint.mission.discodeit.application.service.message.JCFMessageService;
-import com.sprint.mission.discodeit.repository.message.interfaces.MessageRepository;
-import java.io.FileInputStream;
-import java.io.IOException;
-import java.io.InputStream;
-import java.util.Properties;
-
-public class MessageFactory {
-
-    private static final MessageRepository MESSAGE_REPOSITORY = createMessageRepository();
-    private static final MessageService MESSAGE_SERVICE =
-            new JCFMessageService(MESSAGE_REPOSITORY, ChannelFactory.getChannelService(), UserFactory.getUserService());
-
-    public static MessageService getMessageService() {
-        return MESSAGE_SERVICE;
-    }
-
-    public static MessageRepository createMessageRepository() {
-        Properties properties = new Properties();
-        try (InputStream is = ChannelFactory.class.getClassLoader().getResourceAsStream("application.properties")) {
-            properties.load(is);
-        } catch (IOException e) {
-            System.out.println("설정 파일 로드 실패, 기본값(memory) 사용");
-        }
-        String repositoryType = properties.getProperty("repository.type", "memory");
-
-        return switch (repositoryType) {
-            default -> MESSAGE_REPOSITORY;
-        };
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/UserFactory.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/UserFactory.java
deleted file mode 100644
index cbbe58db9..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/config/UserFactory.java
+++ /dev/null
@@ -1,44 +0,0 @@
-package com.sprint.mission.discodeit.config;
-
-import com.sprint.mission.discodeit.application.auth.PasswordEncoder;
-import com.sprint.mission.discodeit.application.service.interfaces.UserService;
-import com.sprint.mission.discodeit.application.service.user.JCFUserService;
-import com.sprint.mission.discodeit.application.service.user.converter.UserConverter;
-import com.sprint.mission.discodeit.application.service.userstatus.UserStatusService;
-import com.sprint.mission.discodeit.repository.user.InMemoryUserRepository;
-import com.sprint.mission.discodeit.repository.user.interfaces.UserRepository;
-import com.sprint.mission.discodeit.repository.userstatus.UserStatusInMemoryRepository;
-import com.sprint.mission.discodeit.repository.userstatus.interfaces.UserStatusRepository;
-import java.io.IOException;
-import java.io.InputStream;
-import java.util.Properties;
-
-public class UserFactory {
-
-    private static final UserRepository USER_REPOSITORY = createUserRepository();
-    private static final UserService USER_SERVICE =
-            new JCFUserService(
-                    USER_REPOSITORY,
-                    new UserConverter(),
-                    new PasswordEncoder(),
-                    new UserStatusService(new UserStatusInMemoryRepository())
-            );
-
-    public static UserService getUserService() {
-        return USER_SERVICE;
-    }
-
-    public static UserRepository createUserRepository() {
-        Properties properties = new Properties();
-        try (InputStream is = ChannelFactory.class.getClassLoader().getResourceAsStream("application.properties")) {
-            properties.load(is);
-        } catch (IOException exception) {
-            System.out.println("설정 파일 로드 실패, 기본값(memory) 사용");
-        }
-        String repositoryType = properties.getProperty("repository.type", "memory");
-
-        return switch (repositoryType) {
-            default -> new InMemoryUserRepository();
-        };
-    }
-}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/resources/application.properties b/codeit-bootcamp-spring/1-sprint-mission/src/main/resources/application.properties
deleted file mode 100644
index 449ef48d0..000000000
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/resources/application.properties
+++ /dev/null
@@ -1 +0,0 @@
-repository.type = "memory"
\ No newline at end of file
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/resources/application.yaml b/codeit-bootcamp-spring/1-sprint-mission/src/main/resources/application.yaml
new file mode 100644
index 000000000..e69de29bb

From 7cbfa3dcfd6d5cf318475fca41a8f490321e62c6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?=
 <157946706+jaewoo9797@users.noreply.github.com>
Date: Tue, 11 Feb 2025 15:26:23 +0900
Subject: [PATCH 31/38] =?UTF-8?q?refactor:=20=EC=9D=BC=EA=B4=80=EB=90=9C?=
 =?UTF-8?q?=20=EC=BD=94=EB=94=A9=20=EC=8A=A4=ED=83=80=EC=9D=BC=20=EC=88=98?=
 =?UTF-8?q?=EC=A0=95?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../mission/discodeit/JavaApplication.java    |  2 +-
 .../service/channel/JCFChannelService.java    |  4 +-
 .../service/user/JCFUserService.java          | 10 +++-
 .../discodeit/domain/channel/Channel.java     | 12 +++--
 .../domain/channel/ParticipatedUser.java      |  4 ++
 .../mission/discodeit/domain/user/Email.java  | 34 ++++++++++---
 .../discodeit/domain/user/Nickname.java       | 34 ++++++++++---
 .../discodeit/domain/user/Password.java       | 10 ++--
 .../discodeit/domain/user/Username.java       | 49 ++++++++++++++++---
 .../user/validation/PasswordValidator.java    |  1 +
 .../global/error/GlobalException.java         |  3 +-
 ...ry.java => ChannelInMemoryRepository.java} |  8 +--
 .../channel/FileChannelRepository.java        |  3 +-
 .../channel/interfaces/ChannelRepository.java |  2 +-
 .../message/FileMessageRepository.java        |  1 +
 ...ry.java => MessageInMemoryRepository.java} |  5 +-
 .../ReadStatusInMemoryRepository.java         |  2 +
 ...ry.java => ChannelInMemoryRepository.java} |  2 +-
 18 files changed, 149 insertions(+), 37 deletions(-)
 rename codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/{InMemoryChannelRepository.java => ChannelInMemoryRepository.java} (81%)
 rename codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/{InMemoryMessageRepository.java => MessageInMemoryRepository.java} (86%)
 rename codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/{InMemoryUserRepository.java => ChannelInMemoryRepository.java} (96%)

diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/JavaApplication.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/JavaApplication.java
index a18709bd9..c25af5bc1 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/JavaApplication.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/JavaApplication.java
@@ -3,6 +3,6 @@
 public class JavaApplication {
 
     public static void main(String[] args) {
-
     }
+
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java
index 5855789ed..f0d136571 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java
@@ -23,7 +23,9 @@
 import java.time.LocalDateTime;
 import java.util.List;
 import java.util.UUID;
+import org.springframework.stereotype.Service;
 
+@Service
 public class JCFChannelService implements ChannelService {
 
     private final ChannelRepository channelRepository;
@@ -87,7 +89,7 @@ public FoundChannelResponseDto findOneByChannelId(UUID channelId) {
         return toFoundChannelResponseDto(foundChannel);
     }
 
-    public List<FoundChannelResponseDto> findAllByChannelId(UUID userId) {
+    public List<FoundChannelResponseDto> findAllByUserId(UUID userId) {
         List<Channel> channels = channelRepository.findAllByUserId(userId);
         // 채널 한 개당 메세지를 조회해오는 N + 1
         return channels.stream().map(this::toFoundChannelResponseDto).toList();
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/JCFUserService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/JCFUserService.java
index c809e7a0e..9f7f53f1b 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/JCFUserService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/JCFUserService.java
@@ -5,9 +5,11 @@
 import com.sprint.mission.discodeit.application.dto.user.LoginRequestDto;
 import com.sprint.mission.discodeit.application.dto.user.UserResponseDto;
 import com.sprint.mission.discodeit.application.dto.user.joinUserRequestDto;
+import com.sprint.mission.discodeit.application.service.interfaces.ChannelService;
 import com.sprint.mission.discodeit.application.service.interfaces.UserService;
 import com.sprint.mission.discodeit.application.service.user.converter.UserConverter;
 import com.sprint.mission.discodeit.application.service.userstatus.UserStatusService;
+import com.sprint.mission.discodeit.domain.channel.Channel;
 import com.sprint.mission.discodeit.domain.user.BirthDate;
 import com.sprint.mission.discodeit.domain.user.Email;
 import com.sprint.mission.discodeit.domain.user.Nickname;
@@ -21,6 +23,7 @@
 import com.sprint.mission.discodeit.domain.user.validation.PasswordValidator;
 import com.sprint.mission.discodeit.domain.userstatus.UserStatus;
 import com.sprint.mission.discodeit.global.error.ErrorCode;
+import com.sprint.mission.discodeit.repository.channel.interfaces.ChannelRepository;
 import com.sprint.mission.discodeit.repository.user.interfaces.UserRepository;
 import java.util.List;
 import java.util.UUID;
@@ -33,17 +36,20 @@ public class JCFUserService implements UserService {
     private final UserConverter userConverter;
     private final PasswordEncoder passwordEncoder;
     private final UserStatusService userStatusService;
+    private final ChannelRepository channelRepository;
 
     public JCFUserService(
             UserRepository userRepository,
             UserConverter userConverter,
             PasswordEncoder passwordEncoder,
-            UserStatusService userStatusService
+            UserStatusService userStatusService,
+            ChannelRepository channelRepository
     ) {
         this.userRepository = userRepository;
         this.userConverter = userConverter;
         this.passwordEncoder = passwordEncoder;
         this.userStatusService = userStatusService;
+        this.channelRepository = channelRepository;
     }
 
     @Override
@@ -93,6 +99,8 @@ public void changePassword(UUID userId, ChangePasswordRequestDto requestDto) {
     @Override
     public void quitUser(UUID userId) {
         User foundUser = findOneByIdOrThrow(userId);
+        List<Channel> channels = channelRepository.findAllByUserId(userId);
+        channels.forEach(channel -> channel.quitChannel(foundUser));
         userStatusService.delete(foundUser);
         userRepository.deleteByUser(foundUser);
     }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java
index c4fdd4630..cff1c5d7d 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java
@@ -67,10 +67,8 @@ public void updateName(String name) {
         this.name = name.trim();
     }
 
-    private void validate(String name) {
-        if (Objects.isNull(name) || name.isBlank()) {
-            throw new ChannelNameInvalidException(ErrorCode.INVALID_CHANNEL_NAME_NOT_NULL, name);
-        }
+    public void quitChannel(User user) {
+        participatedUser.removeUser(user);
     }
 
     public boolean isManager(User user) {
@@ -85,6 +83,12 @@ public Set<UUID> getParticipantUserId() {
         return this.participatedUser.getParticipatedUserId();
     }
 
+    private void validate(String name) {
+        if (Objects.isNull(name) || name.isBlank()) {
+            throw new ChannelNameInvalidException(ErrorCode.INVALID_CHANNEL_NAME_NOT_NULL, name);
+        }
+    }
+
     public UUID getId() {
         return id;
     }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/ParticipatedUser.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/ParticipatedUser.java
index 1c7a7bd99..721ce8761 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/ParticipatedUser.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/ParticipatedUser.java
@@ -15,6 +15,10 @@ public void addUser(User user) {
         users.put(user.getId(), user);
     }
 
+    public void removeUser(User user) {
+        users.remove(user.getId());
+    }
+
     public Set<UUID> getParticipatedUserId() {
         return Collections.unmodifiableSet(users.keySet());
     }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Email.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Email.java
index 9a6e65384..54d2f0e5f 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Email.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Email.java
@@ -4,13 +4,7 @@
 import com.sprint.mission.discodeit.global.error.ErrorCode;
 import java.util.Objects;
 import java.util.regex.Pattern;
-import lombok.EqualsAndHashCode;
-import lombok.Getter;
-import lombok.ToString;
 
-@Getter
-@EqualsAndHashCode(of = {"value"})
-@ToString(of = {"value"})
 public class Email {
 
     private final static String EMAIL_REGEX = "^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9-]+(?:\\.[a-zA-Z]{2,7})+$";
@@ -31,4 +25,32 @@ public void valid(String email) {
             throw new EmailInvalidException(ErrorCode.INVALID_EMAIL_FORMAT, email);
         }
     }
+
+    public String getValue() {
+        return value;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        Email email = (Email) o;
+        return Objects.equals(value, email.value);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(value);
+    }
+
+    @Override
+    public String toString() {
+        return "Email{" +
+                "value='" + value + '\'' +
+                '}';
+    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Nickname.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Nickname.java
index a03a5cf6a..acd5cc951 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Nickname.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Nickname.java
@@ -5,13 +5,7 @@
 import java.util.Objects;
 import java.util.Set;
 import java.util.regex.Pattern;
-import lombok.EqualsAndHashCode;
-import lombok.Getter;
-import lombok.ToString;
 
-@Getter
-@EqualsAndHashCode(of = {"value"})
-@ToString(of = {"value"})
 public class Nickname {
 
     private static final int MAX_LENGTH = 32;
@@ -63,4 +57,32 @@ private void throwContainForbiddenWord(String value) {
             }
         }
     }
+
+    public String getValue() {
+        return value;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        Nickname nickname = (Nickname) o;
+        return Objects.equals(value, nickname.value);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(value);
+    }
+
+    @Override
+    public String toString() {
+        return "Nickname{" +
+                "value='" + value + '\'' +
+                '}';
+    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Password.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Password.java
index e9362775d..29edea2d5 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Password.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Password.java
@@ -1,8 +1,5 @@
 package com.sprint.mission.discodeit.domain.user;
 
-import lombok.ToString;
-
-@ToString(of = "value")
 public class Password {
 
     private String value;
@@ -22,4 +19,11 @@ private void setValue(String value) {
     public String getValue() {
         return value;
     }
+
+    @Override
+    public String toString() {
+        return "Password{" +
+                "value='" + value + '\'' +
+                '}';
+    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Username.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Username.java
index 8bebe8eef..c85b017d8 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Username.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/Username.java
@@ -5,13 +5,7 @@
 import java.util.Objects;
 import java.util.Set;
 import java.util.regex.Pattern;
-import lombok.EqualsAndHashCode;
-import lombok.Getter;
-import lombok.ToString;
 
-@Getter
-@EqualsAndHashCode(of = "value")
-@ToString(of = "value")
 public class Username {
 
     private static final int MIN_LENGTH = 2;
@@ -31,19 +25,60 @@ public Username(String value) {
         this.value = value.toLowerCase();
     }
 
-    public void validate(final String username) {
+    public void validate(String username) {
+        throwIsNull(username);
+        throwInvalidLength(username);
+        throwInvalidPattern(username);
+        throwContainForbiddenWord(username);
+    }
+
+    public String getValue() {
+        return value;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        Username username = (Username) o;
+        return Objects.equals(value, username.value);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(value);
+    }
+
+    @Override
+    public String toString() {
+        return "Username{" +
+                "value='" + value + '\'' +
+                '}';
+    }
+
+    private void throwIsNull(String username) {
         if (Objects.isNull(username) || username.isBlank()) {
             throw new UserNameInvalidException(ErrorCode.USERNAME_REQUIRED, "");
         }
+    }
 
+    private void throwInvalidLength(String username) {
         if (username.length() > MAX_LENGTH || username.length() < MIN_LENGTH) {
             throw new UserNameInvalidException(ErrorCode.INVALID_USERNAME_LENGTH, username);
         }
+    }
 
+    private void throwInvalidPattern(String username) {
         if (!VALID_USER_NAME_PATTERN.matcher(username).matches()) {
             throw new UserNameInvalidException(ErrorCode.INVALID_USERNAME_FORMAT, username);
         }
+    }
 
+    private void throwContainForbiddenWord(String username) {
         String lowerUsername = username.toLowerCase();
         for (String word : FORBIDDEN_WORD) {
             if (lowerUsername.contains(word)) {
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/PasswordValidator.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/PasswordValidator.java
index 9b45f3949..46405f3f2 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/PasswordValidator.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/validation/PasswordValidator.java
@@ -22,4 +22,5 @@ public static void validateOrThrow(String password) {
             throw new PassWordInvalidException(ErrorCode.WEAK_PASSWORD, password);
         }
     }
+
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/GlobalException.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/GlobalException.java
index ad7c110aa..9b335939d 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/GlobalException.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/GlobalException.java
@@ -2,6 +2,7 @@
 
 import com.sprint.mission.discodeit.global.error.exception.EntityNotFoundException;
 import com.sprint.mission.discodeit.global.error.exception.InvalidException;
+import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.MethodArgumentNotValidException;
 import org.springframework.web.bind.annotation.ExceptionHandler;
@@ -28,7 +29,7 @@ protected ResponseEntity<ErrorResponse> handleInvalidException(InvalidException
     protected ResponseEntity<ErrorResponse> handleEntityNotFoundException(EntityNotFoundException exception) {
         ErrorResponse errorResponse = new ErrorResponse(exception.getErrorCode().getDescription(),
                 exception.getErrorCode().getStatus());
-        return ResponseEntity.status(404).body(errorResponse);
+        return ResponseEntity.status(HttpStatus.NOT_FOUND).body(errorResponse);
     }
 
     @ExceptionHandler(Exception.class)
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/InMemoryChannelRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/ChannelInMemoryRepository.java
similarity index 81%
rename from codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/InMemoryChannelRepository.java
rename to codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/ChannelInMemoryRepository.java
index 8aa30d5fe..a2c720baa 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/InMemoryChannelRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/ChannelInMemoryRepository.java
@@ -9,8 +9,10 @@
 import java.util.Optional;
 import java.util.Set;
 import java.util.UUID;
+import org.springframework.stereotype.Repository;
 
-public class InMemoryChannelRepository implements ChannelRepository {
+@Repository
+public class ChannelInMemoryRepository implements ChannelRepository {
 
     private final Map<UUID, Channel> channelUUIDStore = new HashMap<>();
 
@@ -21,8 +23,8 @@ public Channel save(Channel channel) {
     }
 
     @Override
-    public Optional<Channel> findOneById(UUID uuid) {
-        return Optional.ofNullable(channelUUIDStore.get(uuid));
+    public Optional<Channel> findOneById(UUID channelId) {
+        return Optional.ofNullable(channelUUIDStore.get(channelId));
     }
 
     @Override
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/FileChannelRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/FileChannelRepository.java
index 8242c22ca..1461392de 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/FileChannelRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/FileChannelRepository.java
@@ -8,13 +8,14 @@
 import java.util.UUID;
 
 public class FileChannelRepository implements ChannelRepository {
+
     @Override
     public Channel save(Channel channel) {
         return null;
     }
 
     @Override
-    public Optional<Channel> findOneById(UUID uuid) {
+    public Optional<Channel> findOneById(UUID channelId) {
         return Optional.empty();
     }
 
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/interfaces/ChannelRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/interfaces/ChannelRepository.java
index 16df8f06e..7414bcd56 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/interfaces/ChannelRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/channel/interfaces/ChannelRepository.java
@@ -10,7 +10,7 @@ public interface ChannelRepository {
 
     Channel save(Channel channel);
 
-    Optional<Channel> findOneById(UUID uuid);
+    Optional<Channel> findOneById(UUID channelId);
 
     List<Channel> findAllByUserId(UUID userId);
 
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/FileMessageRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/FileMessageRepository.java
index c954da63b..ed7dc84d0 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/FileMessageRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/FileMessageRepository.java
@@ -8,6 +8,7 @@
 import java.util.UUID;
 
 public class FileMessageRepository implements MessageRepository {
+
     @Override
     public Message save(Message message) {
         return null;
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/InMemoryMessageRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/MessageInMemoryRepository.java
similarity index 86%
rename from codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/InMemoryMessageRepository.java
rename to codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/MessageInMemoryRepository.java
index 1bf305b08..cbfd7c8ac 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/InMemoryMessageRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/message/MessageInMemoryRepository.java
@@ -6,8 +6,11 @@
 import java.time.LocalDateTime;
 import java.util.Optional;
 import java.util.UUID;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public class MessageInMemoryRepository implements MessageRepository {
 
-public class InMemoryMessageRepository implements MessageRepository {
     @Override
     public Message save(Message message) {
         return null;
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/readstatus/ReadStatusInMemoryRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/readstatus/ReadStatusInMemoryRepository.java
index 2eff1677b..a2ab748e8 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/readstatus/ReadStatusInMemoryRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/readstatus/ReadStatusInMemoryRepository.java
@@ -9,7 +9,9 @@
 import java.util.Objects;
 import java.util.Optional;
 import java.util.UUID;
+import org.springframework.stereotype.Repository;
 
+@Repository
 public class ReadStatusInMemoryRepository implements ReadStatusRepository {
 
     private final Map<ReadStatusKey, ReadStatus> readStatusStore = new HashMap<>();
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/InMemoryUserRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/ChannelInMemoryRepository.java
similarity index 96%
rename from codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/InMemoryUserRepository.java
rename to codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/ChannelInMemoryRepository.java
index 54e981a4a..2f9c79bef 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/InMemoryUserRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/ChannelInMemoryRepository.java
@@ -12,7 +12,7 @@
 import org.springframework.stereotype.Repository;
 
 @Repository
-public class InMemoryUserRepository implements UserRepository {
+public class ChannelInMemoryRepository implements UserRepository {
 
     Map<UUID, User> uuidUsers = new HashMap<>();
     Map<Email, User> emailUsers = new HashMap<>();

From cc1d5767ea9eec1bc0bfd192405407f73309f851 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?=
 <157946706+jaewoo9797@users.noreply.github.com>
Date: Tue, 11 Feb 2025 15:27:08 +0900
Subject: [PATCH 32/38] =?UTF-8?q?fix:=20=ED=85=8C=EC=8A=A4=ED=8A=B8=20?=
 =?UTF-8?q?=EC=8B=A4=ED=8C=A8=20=EC=98=A4=EB=A5=98=20=EC=88=98=EC=A0=95?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../java/com/sprint/mission/discodeit/fake/FakeFactory.java | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/FakeFactory.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/FakeFactory.java
index 18e324880..1ff5f6b61 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/FakeFactory.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/FakeFactory.java
@@ -5,9 +5,9 @@
 import com.sprint.mission.discodeit.application.service.user.converter.UserConverter;
 import com.sprint.mission.discodeit.application.service.userstatus.UserStatusService;
 import com.sprint.mission.discodeit.fake.repository.FakeUserRepository;
+import com.sprint.mission.discodeit.repository.channel.ChannelInMemoryRepository;
 import com.sprint.mission.discodeit.repository.user.interfaces.UserRepository;
 import com.sprint.mission.discodeit.repository.userstatus.UserStatusInMemoryRepository;
-import com.sprint.mission.discodeit.repository.userstatus.interfaces.UserStatusRepository;
 
 public class FakeFactory {
     private FakeFactory() {
@@ -22,6 +22,8 @@ public static JCFUserService getUserService() {
                 getUserRepository(),
                 new UserConverter(),
                 new PasswordEncoder(),
-                new UserStatusService(new UserStatusInMemoryRepository()));
+                new UserStatusService(new UserStatusInMemoryRepository()),
+                new ChannelInMemoryRepository()
+        );
     }
 }

From ad5b7673e5911779176779dfbd20e3d457eb22e4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?=
 <157946706+jaewoo9797@users.noreply.github.com>
Date: Tue, 11 Feb 2025 16:50:55 +0900
Subject: [PATCH 33/38] =?UTF-8?q?refactor:=20=EC=A4=91=EB=B3=B5=20?=
 =?UTF-8?q?=ED=95=A8=EC=88=98=20=EB=AC=B6=EA=B8=B0=20=3D=20createChannel?=
 =?UTF-8?q?=20=EA=B4=80=EB=A0=A8=20=EB=A9=94=EC=84=9C=EB=93=9C(public,=20p?=
 =?UTF-8?q?rivate)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../dto/channel/CreateChannelRequestDto.java  |  4 +-
 .../dto/channel/FoundChannelResponseDto.java  |  1 +
 .../service/channel/JCFChannelService.java    | 55 +++++++++----------
 .../service/interfaces/ChannelService.java    |  8 +--
 .../service/message/JCFMessageService.java    |  3 +-
 .../service/readstatus/ReadStatusService.java |  2 +-
 .../discodeit/domain/channel/Channel.java     |  8 ++-
 .../domain/userstatus/UserStatus.java         |  3 +-
 8 files changed, 44 insertions(+), 40 deletions(-)

diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/CreateChannelRequestDto.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/CreateChannelRequestDto.java
index eb690f48e..4a1cf6405 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/CreateChannelRequestDto.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/CreateChannelRequestDto.java
@@ -1,10 +1,12 @@
 package com.sprint.mission.discodeit.application.dto.channel;
 
 import com.sprint.mission.discodeit.domain.channel.enums.ChannelType;
+import com.sprint.mission.discodeit.domain.channel.enums.ChannelVisibility;
 import jakarta.validation.constraints.NotBlank;
 
 public record CreateChannelRequestDto(
         @NotBlank String name,
-        @NotBlank ChannelType channelType
+        @NotBlank ChannelType channelType,
+        @NotBlank ChannelVisibility visibility
 ) {
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/FoundChannelResponseDto.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/FoundChannelResponseDto.java
index ef8eea9ac..a04e9c7d6 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/FoundChannelResponseDto.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/dto/channel/FoundChannelResponseDto.java
@@ -11,6 +11,7 @@ public record FoundChannelResponseDto(
         LocalDateTime lastMessageTime,
         Set<UUID> participatedUserId
 ) {
+    
     public static FoundChannelResponseDto ofPublicChannel(Channel channel, LocalDateTime lastMessageTime) {
         return new FoundChannelResponseDto(channel.getId(), channel.getName(), lastMessageTime, Set.of());
     }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java
index f0d136571..e71c5fdc2 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java
@@ -10,7 +10,6 @@
 import com.sprint.mission.discodeit.application.service.interfaces.ChannelService;
 import com.sprint.mission.discodeit.application.service.interfaces.UserService;
 import com.sprint.mission.discodeit.domain.channel.Channel;
-import com.sprint.mission.discodeit.domain.channel.enums.ChannelType;
 import com.sprint.mission.discodeit.domain.channel.enums.ChannelVisibility;
 import com.sprint.mission.discodeit.domain.channel.exception.AlreadyJoinUserException;
 import com.sprint.mission.discodeit.domain.channel.exception.ChannelNotFoundException;
@@ -47,45 +46,30 @@ public JCFChannelService(
 
     @Override
     public ChannelCreateResponseDto createPublicChannel(UUID userId, CreateChannelRequestDto requestDto) {
-        User foundUser = userService.findOneByIdOrThrow(userId);
-        ChannelType channelType = requestDto.channelType();
-        Channel createChannel = new Channel(requestDto.name(), channelType, foundUser, ChannelVisibility.PUBLIC);
-        Channel savedChannel = channelRepository.save(createChannel);
+        Channel savedChannel = createChannelWithVisibility(userId, requestDto);
         return ChannelCreateResponseDto.from(savedChannel);
     }
 
+    // 같은 기능의 중복 메서드 => 요구사항에 두 개로 나누어 두라고 했지만, 로직이 매우 비슷.
     @Override
-    public ChannelCreateResponseDto createPrivateChannel(UUID userId) {
-        User foundUser = userService.findOneByIdOrThrow(userId);
-        Channel createChannel = Channel.ofPrivateChannel(foundUser, ChannelType.TEXT);
-        Channel savedChannel = channelRepository.save(createChannel);
-        ReadStatus readStatus = new ReadStatus(foundUser, savedChannel);
-        readStatusRepository.save(readStatus);
+    public ChannelCreateResponseDto createPrivateChannel(UUID userId, CreateChannelRequestDto requestDto) {
+        Channel savedChannel = createChannelWithVisibility(userId, requestDto);
         return ChannelCreateResponseDto.from(savedChannel);
     }
 
     @Override
-    public void joinPublicChannel(UUID invitedUserId, InviteChannelRequestDto requestDto) {
+    public void joinChannel(UUID invitedUserId, InviteChannelRequestDto requestDto) {
         User foundUser = userService.findOneByIdOrThrow(invitedUserId);
-        Channel foundChannel = findOneByIdOrThrow(requestDto.channelId());
-        foundChannel.join(foundUser);
-        channelRepository.save(foundChannel);
-    }
-
-    @Override
-    public void joinPrivateChannel(UUID invitedUserId, InviteChannelRequestDto requestDto) {
-        User foundUser = userService.findOneByIdOrThrow(invitedUserId);
-        Channel foundChannel = findOneByIdOrThrow(requestDto.channelId());
+        Channel foundChannel = findOneByChannelIdOrThrow(requestDto.channelId());
         throwIsAlreadyJoinUser(foundUser, foundChannel);
         foundChannel.join(foundUser);
-        ReadStatus readStatus = new ReadStatus(foundUser, foundChannel);
-        readStatusRepository.save(readStatus);
+        createAndSaveReadStatus(foundUser, foundChannel);
         channelRepository.save(foundChannel);
     }
 
     @Override
     public FoundChannelResponseDto findOneByChannelId(UUID channelId) {
-        Channel foundChannel = findOneByIdOrThrow(channelId);
+        Channel foundChannel = findOneByChannelIdOrThrow(channelId);
         return toFoundChannelResponseDto(foundChannel);
     }
 
@@ -96,7 +80,7 @@ public List<FoundChannelResponseDto> findAllByUserId(UUID userId) {
     }
 
     @Override
-    public Channel findOneByIdOrThrow(UUID id) {
+    public Channel findOneByChannelIdOrThrow(UUID id) {
         return channelRepository.findOneById(id)
                 .orElseThrow(() -> new ChannelNotFoundException(ErrorCode.NOT_FOUND));
     }
@@ -104,7 +88,7 @@ public Channel findOneByIdOrThrow(UUID id) {
     @Override
     public void changeSubject(UUID userId, ChangeChannelSubjectRequestDto requestDto) {
         User foundUser = userService.findOneByIdOrThrow(userId);
-        Channel foundChannel = findOneByIdOrThrow(requestDto.channelId());
+        Channel foundChannel = findOneByChannelIdOrThrow(requestDto.channelId());
         throwIsNotManager(foundUser, foundChannel);
         foundChannel.updateSubject(requestDto.subject());
         channelRepository.save(foundChannel);
@@ -113,7 +97,7 @@ public void changeSubject(UUID userId, ChangeChannelSubjectRequestDto requestDto
     @Override
     public void changeChannelName(UUID userId, ChangeChannelNameRequestDto requestDto) {
         User foundUser = userService.findOneByIdOrThrow(userId);
-        Channel foundChannel = findOneByIdOrThrow(requestDto.channelId());
+        Channel foundChannel = findOneByChannelIdOrThrow(requestDto.channelId());
         throwIsNotManager(foundUser, foundChannel);
         foundChannel.updateName(requestDto.channelName());
         channelRepository.save(foundChannel);
@@ -122,7 +106,7 @@ public void changeChannelName(UUID userId, ChangeChannelNameRequestDto requestDt
     @Override
     public void deleteChannel(UUID userId, DeleteChannelRequestDto requestDto) {
         User foundUser = userService.findOneByIdOrThrow(userId);
-        Channel foundChannel = findOneByIdOrThrow(requestDto.channelId());
+        Channel foundChannel = findOneByChannelIdOrThrow(requestDto.channelId());
         throwIsNotManager(foundUser, foundChannel);
         readStatusRepository.deleteByChannel(foundChannel);
         messageRepository.deleteByChannel(foundChannel);
@@ -149,4 +133,19 @@ private void throwIsAlreadyJoinUser(User targetUser, Channel targetChannel) {
             throw new AlreadyJoinUserException(ErrorCode.ALREADY_CHANNEL_JOIN_USER, targetUser.getNicknameValue());
         }
     }
+
+    private void createAndSaveReadStatus(User foundUser, Channel savedChannel) {
+        ReadStatus readStatus = new ReadStatus(foundUser, savedChannel);
+        readStatusRepository.save(readStatus);
+    }
+
+    private Channel createChannelWithVisibility(UUID userId, CreateChannelRequestDto requestDto) {
+        User foundUser = userService.findOneByIdOrThrow(userId);
+        Channel createChannel = requestDto.visibility() == ChannelVisibility.PUBLIC ?
+                Channel.ofPublicChannel(requestDto.name(), requestDto.channelType(), foundUser) :
+                Channel.ofPrivateChannel(foundUser, requestDto.channelType());
+        Channel savedChannel = channelRepository.save(createChannel);
+        createAndSaveReadStatus(foundUser, savedChannel);
+        return savedChannel;
+    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/ChannelService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/ChannelService.java
index a67d53b28..e9f32749c 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/ChannelService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/ChannelService.java
@@ -14,15 +14,13 @@ public interface ChannelService {
 
     ChannelCreateResponseDto createPublicChannel(UUID userId, CreateChannelRequestDto requestDto);
 
-    ChannelCreateResponseDto createPrivateChannel(UUID userId);
+    ChannelCreateResponseDto createPrivateChannel(UUID userId, CreateChannelRequestDto requestDto);
 
-    void joinPublicChannel(UUID invitedUserId, InviteChannelRequestDto requestDto);
-
-    void joinPrivateChannel(UUID invitedUserId, InviteChannelRequestDto requestDto);
+    void joinChannel(UUID invitedUserId, InviteChannelRequestDto requestDto);
 
     FoundChannelResponseDto findOneByChannelId(UUID channelId);
 
-    Channel findOneByIdOrThrow(UUID uuid);
+    Channel findOneByChannelIdOrThrow(UUID uuid);
 
     void changeSubject(UUID userId, ChangeChannelSubjectRequestDto requestDto);
 
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/JCFMessageService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/JCFMessageService.java
index 88d2b0c7d..0864643c3 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/JCFMessageService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/JCFMessageService.java
@@ -13,7 +13,6 @@
 import com.sprint.mission.discodeit.domain.user.User;
 import com.sprint.mission.discodeit.global.error.ErrorCode;
 import com.sprint.mission.discodeit.repository.message.interfaces.MessageRepository;
-import java.time.LocalDateTime;
 import java.util.UUID;
 
 public class JCFMessageService implements MessageService {
@@ -35,7 +34,7 @@ public JCFMessageService(
     @Override
     public MessageResponseDto createMessage(CreateMessageRequestDto requestDto) {
         User sender = userService.findOneByIdOrThrow(requestDto.userId());
-        Channel destinationChannel = channelService.findOneByIdOrThrow(requestDto.destinationChannelId());
+        Channel destinationChannel = channelService.findOneByChannelIdOrThrow(requestDto.destinationChannelId());
         Message createMessage = messageRepository.save(new Message(sender, destinationChannel, requestDto.content()));
         return MessageResponseDto.from(createMessage);
     }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/readstatus/ReadStatusService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/readstatus/ReadStatusService.java
index 33b390387..80937c91f 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/readstatus/ReadStatusService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/readstatus/ReadStatusService.java
@@ -29,7 +29,7 @@ public ReadStatusService(
 
     public void updateLastReadTime(UUID userId, ReadStatusUpdateRequestDto requestDto) {
         User foundUser = userService.findOneByIdOrThrow(userId);
-        Channel foundChannel = channelService.findOneByIdOrThrow(requestDto.channelId());
+        Channel foundChannel = channelService.findOneByChannelIdOrThrow(requestDto.channelId());
         ReadStatus readStatus = findOneByUserIdAndChannelId(foundUser, foundChannel).orElseGet(() -> new ReadStatus(foundUser, foundChannel));
         readStatus.updateLastReadAt(Instant.now());
         readStatusRepository.save(readStatus);
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java
index cff1c5d7d..ff5fa5dc3 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java
@@ -29,7 +29,7 @@ public class Channel implements Serializable {
     private final ChannelVisibility visibility;
     private final ParticipatedUser participatedUser;
 
-    public Channel(
+    private Channel(
             String name,
             ChannelType type,
             User manager,
@@ -47,6 +47,10 @@ public Channel(
         participatedUser = new ParticipatedUser();
     }
 
+    public static Channel ofPublicChannel(String name, ChannelType type, User user) {
+        return new Channel(name, type, user, ChannelVisibility.PUBLIC);
+    }
+
     public static Channel ofPrivateChannel(User manager, ChannelType type) {
         return new Channel("", type, manager, ChannelVisibility.PRIVATE);
     }
@@ -84,7 +88,7 @@ public Set<UUID> getParticipantUserId() {
     }
 
     private void validate(String name) {
-        if (Objects.isNull(name) || name.isBlank()) {
+        if (Objects.isNull(name)) {
             throw new ChannelNameInvalidException(ErrorCode.INVALID_CHANNEL_NAME_NOT_NULL, name);
         }
     }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/userstatus/UserStatus.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/userstatus/UserStatus.java
index be26baf53..f6c757a19 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/userstatus/UserStatus.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/userstatus/UserStatus.java
@@ -2,6 +2,7 @@
 
 import com.sprint.mission.discodeit.domain.user.User;
 import com.sprint.mission.discodeit.domain.userstatus.enums.OnlineStatus;
+import java.time.Duration;
 import java.time.Instant;
 import java.time.temporal.ChronoUnit;
 import java.util.Objects;
@@ -33,7 +34,7 @@ public void updateLastAccessedAt() {
     }
 
     public OnlineStatus getOnlineStatus() {
-        if (lastAccessedAt.isAfter(Instant.now().minus(5, ChronoUnit.MINUTES))) {
+        if (Duration.between(createdAt, Instant.now()).toMinutes() <= 5L) {
             return OnlineStatus.ONLINE;
         }
         return OnlineStatus.OFFLINE;

From 8fd15994ab809543b5f39b2f31d20866b323d6ba Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?=
 <157946706+jaewoo9797@users.noreply.github.com>
Date: Tue, 11 Feb 2025 17:07:14 +0900
Subject: [PATCH 34/38] =?UTF-8?q?refactor:=20=EB=B6=84=EA=B8=B0=20?=
 =?UTF-8?q?=EC=B2=98=EB=A6=AC=20=EC=82=BC=ED=95=AD=EC=97=B0=EC=82=B0?=
 =?UTF-8?q?=EC=9E=90,=20if=20=EB=AC=B8=20=EC=A7=88=EB=AC=B8?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../service/channel/JCFChannelService.java      | 17 +++++++++++++----
 .../exception/NotChannelManagerException.java   | 11 +++++++++++
 .../discodeit/global/error/ErrorCode.java       |  2 ++
 3 files changed, 26 insertions(+), 4 deletions(-)
 create mode 100644 codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/exception/NotChannelManagerException.java

diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java
index e71c5fdc2..9ad33bb94 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java
@@ -13,6 +13,7 @@
 import com.sprint.mission.discodeit.domain.channel.enums.ChannelVisibility;
 import com.sprint.mission.discodeit.domain.channel.exception.AlreadyJoinUserException;
 import com.sprint.mission.discodeit.domain.channel.exception.ChannelNotFoundException;
+import com.sprint.mission.discodeit.domain.channel.exception.NotChannelManagerException;
 import com.sprint.mission.discodeit.domain.readStatus.ReadStatus;
 import com.sprint.mission.discodeit.domain.user.User;
 import com.sprint.mission.discodeit.global.error.ErrorCode;
@@ -115,7 +116,7 @@ public void deleteChannel(UUID userId, DeleteChannelRequestDto requestDto) {
 
     private void throwIsNotManager(User foundUser, Channel foundChannel) {
         if (!foundChannel.isManager(foundUser)) {
-            throw new IllegalArgumentException();
+            throw new NotChannelManagerException(ErrorCode.CHANNEL_ADMIN_REQUIRED, foundUser.getUsernameValue());
         }
     }
 
@@ -141,9 +142,17 @@ private void createAndSaveReadStatus(User foundUser, Channel savedChannel) {
 
     private Channel createChannelWithVisibility(UUID userId, CreateChannelRequestDto requestDto) {
         User foundUser = userService.findOneByIdOrThrow(userId);
-        Channel createChannel = requestDto.visibility() == ChannelVisibility.PUBLIC ?
-                Channel.ofPublicChannel(requestDto.name(), requestDto.channelType(), foundUser) :
-                Channel.ofPrivateChannel(foundUser, requestDto.channelType());
+        Channel createChannel = null;
+        if (requestDto.visibility() == ChannelVisibility.PUBLIC) {
+            createChannel = Channel.ofPublicChannel(requestDto.name(), requestDto.channelType(), foundUser);
+        } else if (requestDto.visibility() == ChannelVisibility.PRIVATE) {
+            createChannel = Channel.ofPrivateChannel(foundUser, requestDto.channelType());
+        }
+//        ====> 삼항 연산자와 if 문 분기처리 중 어떤 것을 더 선호해야할까요? 제가 생각하기에는 삼항 연산자가 보기 더 편한것 같습니다.
+//        다음 미션에서는 둘 중 하나 지워두겠습니다.
+//        createChannel = requestDto.visibility() == ChannelVisibility.PUBLIC ?
+//                Channel.ofPublicChannel(requestDto.name(), requestDto.channelType(), foundUser) :
+//                Channel.ofPrivateChannel(foundUser, requestDto.channelType());
         Channel savedChannel = channelRepository.save(createChannel);
         createAndSaveReadStatus(foundUser, savedChannel);
         return savedChannel;
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/exception/NotChannelManagerException.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/exception/NotChannelManagerException.java
new file mode 100644
index 000000000..ebadc2999
--- /dev/null
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/exception/NotChannelManagerException.java
@@ -0,0 +1,11 @@
+package com.sprint.mission.discodeit.domain.channel.exception;
+
+import com.sprint.mission.discodeit.global.error.ErrorCode;
+import com.sprint.mission.discodeit.global.error.exception.InvalidException;
+
+public class NotChannelManagerException extends InvalidException {
+
+    public NotChannelManagerException(ErrorCode errorCode, String message) {
+        super(errorCode, message);
+    }
+}
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorCode.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorCode.java
index 26003aa78..baa572534 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorCode.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/ErrorCode.java
@@ -30,6 +30,8 @@ public enum ErrorCode {
     // Channel
     INVALID_CHANNEL_NAME_NOT_NULL(400, "채널 이름은 필수 입력값 입니다."),
     ALREADY_CHANNEL_JOIN_USER(400, "이미 참여한 채널입니다."),
+    CHANNEL_ADMIN_REQUIRED(400, "채널 삭제가 허용되지 않은 사용자입니다."),
+
     // Message
     INVALID_MESSAGE_CONTENT_NOT_NULL(400, "메시지 내용은 필수 입력값 입니다."),
     ;

From d0231209ac3fb544247490059fd3493460b97135 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?=
 <157946706+jaewoo9797@users.noreply.github.com>
Date: Tue, 11 Feb 2025 17:14:09 +0900
Subject: [PATCH 35/38] =?UTF-8?q?docs:=20=EC=9A=94=EA=B5=AC=EC=82=AC?=
 =?UTF-8?q?=ED=95=AD=20=EC=82=AD=EC=A0=9C=20(=EC=BD=94=EB=93=9C=EC=97=90?=
 =?UTF-8?q?=20=EC=A7=91=EC=A4=91=ED=95=A0=20=EC=88=98=20=EC=9E=87=EB=8F=84?=
 =?UTF-8?q?=EB=A1=9D)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../1-sprint-mission/README.md                | 102 ------------------
 1 file changed, 102 deletions(-)

diff --git a/codeit-bootcamp-spring/1-sprint-mission/README.md b/codeit-bootcamp-spring/1-sprint-mission/README.md
index 4e7efe866..e69de29bb 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/README.md
+++ b/codeit-bootcamp-spring/1-sprint-mission/README.md
@@ -1,102 +0,0 @@
-프로젝트 마일스톤
-
-- Java 프로젝트를 Spring 프로젝트로 마이그레이션
-- 의존성 관리를 IoC Container에 위임하도록 리팩토링
-- 비즈니스 로직 고도화
-  기본 요구사항
-  Spring 프로젝트 초기화
- - [x] Spring Initializr를 통해 zip 파일을 다운로드하세요.
-   - [x] 빌드 시스템은 Gradle - Groovy를 사용합니다.
-   - [x] 언어는 Java 17를 사용합니다.
-   - [x] Spring Boot의 버전은 3.4.0입니다.
-   - [x] GroupId는 com.sprint.mission입니다.
-   - [x] ArtifactId와 Name은 discodeit입니다.
-   - [x] packaging 형식은 Jar입니다
-   - [x] Dependency를 추가합니다.
-   - [x] Lombok
-   - [x] Spring Web
- - [x] zip 파일을 압축해제하고 원래 진행 중이던 프로젝트에 붙여넣기하세요. 일부 파일은 덮어쓰기할 수 있습니다.
-   - [x] application.properties 파일을 yaml 형식으로 변경하세요.
-   - [x] DiscodeitApplication의 main 메서드를 실행하고 로그를 확인해보세요.
-
-
----
-
-Bean 선언 및 테스트
-- [x] File*Repository 구현체를 Repository 인터페이스의 Bean으로 등록하세요.
-- [x] Basic*Service 구현체를 Service 인터페이스의 Bean으로 등록하세요.
-- [x] JavaApplication에서 테스트했던 코드를 DiscodeitApplication에서 테스트해보세요.
-  - [x]  JavaApplication 의 main 메소드를 제외한 모든 메소드를 DiscodeitApplication클래스로 복사하세요.
-  - [x]  JavaApplication의 main 메소드에서 Service를 초기화하는 코드를 Spring Context를 활용하여 대체하세요.
-
-```java
-// JavaApplication
-public static void main(String[] args) {
-    // 레포지토리 초기화
-    // ...
-    // 서비스 초기화
-      UserService userService = new BasicUserService(userRepository);
-    ChannelService channelService = new BasicChannelService(channelRepository);
-    MessageService messageService = new BasicMessageService(messageRepository, channelRepository, userRepository);
-
-    // ...
-}
-
-// DiscodeitApplication
-public static void main(String[] args) {
-        ConfigurableApplicationContext context = SpringApplication.run(DiscodeitApplication.class, args);
-    // 서비스 초기화
-        // TODO context에서 Bean을 조회하여 각 서비스 구현체 할당 코드 작성하세요.
-      UserService userService;
-    ChannelService channelService;
-    MessageService messageService;
-
-    // ...
-}
-```
-
-   - [x]  JavaApplication의 main 메소드의 셋업, 테스트 부분의 코드를 DiscodeitApplication클래스로 복사하세요.
-```java
-public static void main(String[] args) {
-    // ...
-    // 셋업
-    User user = setupUser(userService);
-    Channel channel = setupChannel(channelService);
-    // 테스트
-    messageCreateTest(messageService, channel, user);
-}
-```
-
-Spring 핵심 개념 이해하기
-- [ ] JavaApplication과 DiscodeitApplication에서 Service를 초기화하는 방식의 차이에 대해 다음의 키워드를 중심으로 정리해보세요.   
-IoC Container   
-Dependency Injection   
-Bean   
-
-
-Lombok 적용
-- [x] 도메인 모델의 getter 메소드를 @Getter로 대체해보세요.
-- [x] Basic*Service의 생성자를 @RequiredArgsConstructor로 대체해보세요.
-
-
-비즈니스 로직 고도화
-- [ ]  다음의 기능 요구 사항을 구현하세요.
-
-추가 기능 요구사항
-시간 타입 변경하기
-- [ ] 시간을 다루는 필드의 타입은 Instant로 통일합니다.
-  - 기존에 사용하던 Long보다 가독성이 뛰어나며, 시간대(Time Zone) 변환과 정밀한 시간 연산이 가능해 확장성이 높습니다.  
-
-**새로운 도메인 추가하기**
-- [ ] 공통: 앞서 정의한 도메인 모델과 동일하게 공통 필드(id, createdAt, updatedAt)를 포함합니다.
-- [ ] ReadStatus
-  - 사용자가 채널 별 마지막으로 메시지를 읽은 시간을 표현하는 도메인 모델입니다. 사용자별 각 채널에 읽지 않은 메시지를 확인하기 위해 활용합니다.
-- [ ] UserStatus
-  - 사용자 별 마지막으로 확인된 접속 시간을 표현하는 도메인 모델입니다. 사용자의 온라인 상태를 확인하기 위해 활용합니다.
-  - [ ] 마지막 접속 시간을 기준으로 현재 로그인한 유저로 판단할 수 있는 메소드를 정의하세요. 마지막 접속 시간이 현재 시간으로부터 5분 이내이면 현재 접속 중인 유저로 간주합니다.
-- [ ] BinaryContent
-  - 이미지, 파일 등 바이너리 데이터를 표현하는 도메인 모델입니다. 사용자의 프로필 이미지, 메시지에 첨부된 파일을 저장하기 위해 활용합니다.
-  - [ ] 수정 불가능한 도메인 모델로 간주합니다. 따라서 updatedAt 필드는 정의하지 않습니다.
-  - [ ] User, Message 도메인 모델과의 의존 관계 방향성을 잘 고려하여 id 참조 필드를 추가하세요.
-- [ ] 각 도메인 모델 별 레포지토리 인터페이스를 선언하세요.
-레포지토리 구현체(File, JCF)는 아직 구현하지 마세요. 이어지는 서비스 고도화 요구사항에 따라 레포지토리 인터페이스에 메소드가 추가될 수 있어요.
\ No newline at end of file

From fef505579953fe6539d9be6cf5f79c7f357daefd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?=
 <157946706+jaewoo9797@users.noreply.github.com>
Date: Tue, 11 Feb 2025 17:19:59 +0900
Subject: [PATCH 36/38] =?UTF-8?q?refactor:=20lombok=20=EC=96=B4=EB=85=B8?=
 =?UTF-8?q?=ED=85=8C=EC=9D=B4=EC=85=98=20=EC=82=AD=EC=A0=9C?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../1-sprint-mission/build.gradle                |  4 ++--
 .../application/service/user/JCFUserService.java | 16 ++++++++--------
 .../mission/discodeit/domain/user/BirthDate.java |  5 +++--
 .../mission/discodeit/domain/user/User.java      |  2 --
 .../error/exception/BusinessException.java       |  2 --
 .../discodeit/fake/domain/user/StubUser.java     | 16 ++++++++--------
 6 files changed, 21 insertions(+), 24 deletions(-)

diff --git a/codeit-bootcamp-spring/1-sprint-mission/build.gradle b/codeit-bootcamp-spring/1-sprint-mission/build.gradle
index 6feb1dcd3..602a354c3 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/build.gradle
+++ b/codeit-bootcamp-spring/1-sprint-mission/build.gradle
@@ -25,8 +25,8 @@ repositories {
 
 dependencies {
     implementation 'org.springframework.boot:spring-boot-starter-web'
-    compileOnly 'org.projectlombok:lombok'
-    annotationProcessor 'org.projectlombok:lombok'
+//    compileOnly 'org.projectlombok:lombok'
+//    annotationProcessor 'org.projectlombok:lombok'
     testImplementation 'org.springframework.boot:spring-boot-starter-test'
     testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
 
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/JCFUserService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/JCFUserService.java
index 9f7f53f1b..310051130 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/JCFUserService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/JCFUserService.java
@@ -122,13 +122,13 @@ private boolean matchUserPassword(String rawPassword, String encodedPassword) {
     }
 
     private User toUserWithPasswordEncode(joinUserRequestDto requestDto) {
-        return User.builder()
-                .username(new Username(requestDto.username()))
-                .nickname(new Nickname(requestDto.nickname()))
-                .email(new Email(requestDto.email()))
-                .password(new Password(passwordEncoder.encode(requestDto.password())))
-                .birthDate(new BirthDate(requestDto.birthDate()))
-                .emailSubscriptionStatus(EmailSubscriptionStatus.UNSUBSCRIBED)
-                .build();
+        return new User(
+                new Nickname(requestDto.nickname()),
+                new Username(requestDto.username()),
+                new Email(requestDto.email()),
+                new Password(passwordEncoder.encode(requestDto.password())),
+                new BirthDate(requestDto.birthDate()),
+                EmailSubscriptionStatus.UNSUBSCRIBED
+        );
     }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/BirthDate.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/BirthDate.java
index a2dc412ca..f992b0c9b 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/BirthDate.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/BirthDate.java
@@ -4,9 +4,7 @@
 import com.sprint.mission.discodeit.global.error.ErrorCode;
 import java.time.LocalDate;
 import java.util.Objects;
-import lombok.Getter;
 
-@Getter
 public class BirthDate {
     private static final int MIN_AGE_RESTRICT = 13;
 
@@ -31,4 +29,7 @@ public void validate(LocalDate birthDate) {
         }
     }
 
+    public LocalDate getValue() {
+        return value;
+    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/User.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/User.java
index 4825d73e9..a4e7d5150 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/User.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/User.java
@@ -6,7 +6,6 @@
 import java.time.Instant;
 import java.util.Objects;
 import java.util.UUID;
-import lombok.Builder;
 
 public class User implements Serializable {
 
@@ -23,7 +22,6 @@ public class User implements Serializable {
     private final Instant updatedAt;
     private final EmailSubscriptionStatus emailSubscriptionStatus;
 
-    @Builder
     public User(
             Nickname nickname,
             Username username,
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/exception/BusinessException.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/exception/BusinessException.java
index 917cf9764..6162e5457 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/exception/BusinessException.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/global/error/exception/BusinessException.java
@@ -1,9 +1,7 @@
 package com.sprint.mission.discodeit.global.error.exception;
 
 import com.sprint.mission.discodeit.global.error.ErrorCode;
-import lombok.Getter;
 
-@Getter
 public class BusinessException extends RuntimeException {
 
     protected final ErrorCode errorCode;
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/domain/user/StubUser.java b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/domain/user/StubUser.java
index 5e5614782..dd216d603 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/domain/user/StubUser.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/test/java/com/sprint/mission/discodeit/fake/domain/user/StubUser.java
@@ -19,14 +19,14 @@ public class StubUser {
     private static final LocalDate BIRTH_DATE = LocalDate.of(2000, 1, 1);
 
     public static User generateUser() {
-        return User.builder()
-            .username(new Username(USER_NAME))
-            .nickname(new Nickname(NICK_NAME))
-            .email(new Email(EMAIL))
-            .password(new Password(PASSWORD))
-            .birthDate(new BirthDate(BIRTH_DATE))
-            .emailSubscriptionStatus(EmailSubscriptionStatus.SUBSCRIBED)
-            .build();
+        return new User(
+                new Nickname(USER_NAME),
+                new Username(USER_NAME),
+                new Email(EMAIL),
+                new Password(PASSWORD),
+                new BirthDate(BIRTH_DATE),
+                EmailSubscriptionStatus.UNSUBSCRIBED
+        );
     }
 
     public static joinUserRequestDto generateJoinRequestDto() {

From dfd4968a0125281672ce1a708638e6925a135aaf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?=
 <157946706+jaewoo9797@users.noreply.github.com>
Date: Tue, 11 Feb 2025 17:36:48 +0900
Subject: [PATCH 37/38] =?UTF-8?q?refactor:=20=ED=95=84=EC=9A=94=EC=97=86?=
 =?UTF-8?q?=EB=8A=94=20=EB=8D=B0=EC=9D=B4=ED=84=B0=EB=B2=A0=EC=9D=B4?=
 =?UTF-8?q?=EC=8A=A4=20=EC=A0=91=EA=B7=BC=20=EB=A1=9C=EC=A7=81=20=EC=82=AD?=
 =?UTF-8?q?=EC=A0=9C=20(ReadStatus)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../service/channel/JCFChannelService.java    | 16 ++++++++--------
 .../service/interfaces/MessageService.java    |  2 +-
 .../service/interfaces/UserService.java       |  2 +-
 .../service/message/JCFMessageService.java    | 19 ++++++++++++-------
 .../service/readstatus/ReadStatusService.java | 16 +++++-----------
 .../service/user/JCFUserService.java          |  7 +++----
 .../discodeit/domain/message/Message.java     |  4 ++++
 7 files changed, 34 insertions(+), 32 deletions(-)

diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java
index 9ad33bb94..d62313baa 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/channel/JCFChannelService.java
@@ -60,7 +60,7 @@ public ChannelCreateResponseDto createPrivateChannel(UUID userId, CreateChannelR
 
     @Override
     public void joinChannel(UUID invitedUserId, InviteChannelRequestDto requestDto) {
-        User foundUser = userService.findOneByIdOrThrow(invitedUserId);
+        User foundUser = userService.findOneByUserIdOrThrow(invitedUserId);
         Channel foundChannel = findOneByChannelIdOrThrow(requestDto.channelId());
         throwIsAlreadyJoinUser(foundUser, foundChannel);
         foundChannel.join(foundUser);
@@ -88,7 +88,7 @@ public Channel findOneByChannelIdOrThrow(UUID id) {
 
     @Override
     public void changeSubject(UUID userId, ChangeChannelSubjectRequestDto requestDto) {
-        User foundUser = userService.findOneByIdOrThrow(userId);
+        User foundUser = userService.findOneByUserIdOrThrow(userId);
         Channel foundChannel = findOneByChannelIdOrThrow(requestDto.channelId());
         throwIsNotManager(foundUser, foundChannel);
         foundChannel.updateSubject(requestDto.subject());
@@ -97,7 +97,7 @@ public void changeSubject(UUID userId, ChangeChannelSubjectRequestDto requestDto
 
     @Override
     public void changeChannelName(UUID userId, ChangeChannelNameRequestDto requestDto) {
-        User foundUser = userService.findOneByIdOrThrow(userId);
+        User foundUser = userService.findOneByUserIdOrThrow(userId);
         Channel foundChannel = findOneByChannelIdOrThrow(requestDto.channelId());
         throwIsNotManager(foundUser, foundChannel);
         foundChannel.updateName(requestDto.channelName());
@@ -106,7 +106,7 @@ public void changeChannelName(UUID userId, ChangeChannelNameRequestDto requestDt
 
     @Override
     public void deleteChannel(UUID userId, DeleteChannelRequestDto requestDto) {
-        User foundUser = userService.findOneByIdOrThrow(userId);
+        User foundUser = userService.findOneByUserIdOrThrow(userId);
         Channel foundChannel = findOneByChannelIdOrThrow(requestDto.channelId());
         throwIsNotManager(foundUser, foundChannel);
         readStatusRepository.deleteByChannel(foundChannel);
@@ -141,7 +141,7 @@ private void createAndSaveReadStatus(User foundUser, Channel savedChannel) {
     }
 
     private Channel createChannelWithVisibility(UUID userId, CreateChannelRequestDto requestDto) {
-        User foundUser = userService.findOneByIdOrThrow(userId);
+        User foundUser = userService.findOneByUserIdOrThrow(userId);
         Channel createChannel = null;
         if (requestDto.visibility() == ChannelVisibility.PUBLIC) {
             createChannel = Channel.ofPublicChannel(requestDto.name(), requestDto.channelType(), foundUser);
@@ -150,9 +150,9 @@ private Channel createChannelWithVisibility(UUID userId, CreateChannelRequestDto
         }
 //        ====> 삼항 연산자와 if 문 분기처리 중 어떤 것을 더 선호해야할까요? 제가 생각하기에는 삼항 연산자가 보기 더 편한것 같습니다.
 //        다음 미션에서는 둘 중 하나 지워두겠습니다.
-//        createChannel = requestDto.visibility() == ChannelVisibility.PUBLIC ?
-//                Channel.ofPublicChannel(requestDto.name(), requestDto.channelType(), foundUser) :
-//                Channel.ofPrivateChannel(foundUser, requestDto.channelType());
+//        createChannel = requestDto.visibility() == ChannelVisibility.PUBLIC
+//                ? Channel.ofPublicChannel(requestDto.name(), requestDto.channelType(), foundUser)
+//                : Channel.ofPrivateChannel(foundUser, requestDto.channelType());
         Channel savedChannel = channelRepository.save(createChannel);
         createAndSaveReadStatus(foundUser, savedChannel);
         return savedChannel;
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/MessageService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/MessageService.java
index d1a8b44ec..6346ece32 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/MessageService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/MessageService.java
@@ -15,6 +15,6 @@ public interface MessageService {
 
     void deleteMessage(UUID userId, DeleteMessageRequestDto requestDto);
 
-    Message findOneByIdOrThrow(UUID uuid);
+    Message findOneByMessageIdOrThrow(UUID uuid);
 
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/UserService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/UserService.java
index 836c2bdb0..490da8df6 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/UserService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/interfaces/UserService.java
@@ -14,7 +14,7 @@ public interface UserService {
 
     void login(LoginRequestDto requestDto);
 
-    User findOneByIdOrThrow(UUID userId);
+    User findOneByUserIdOrThrow(UUID userId);
 
     List<UserResponseDto> findAll();
 
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/JCFMessageService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/JCFMessageService.java
index 0864643c3..d466224ad 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/JCFMessageService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/message/JCFMessageService.java
@@ -7,6 +7,7 @@
 import com.sprint.mission.discodeit.application.service.interfaces.ChannelService;
 import com.sprint.mission.discodeit.application.service.interfaces.MessageService;
 import com.sprint.mission.discodeit.application.service.interfaces.UserService;
+import com.sprint.mission.discodeit.application.service.readstatus.ReadStatusService;
 import com.sprint.mission.discodeit.domain.channel.Channel;
 import com.sprint.mission.discodeit.domain.message.Message;
 import com.sprint.mission.discodeit.domain.message.exception.MessageNotFoundException;
@@ -20,20 +21,23 @@ public class JCFMessageService implements MessageService {
     private final MessageRepository messageRepository;
     private final ChannelService channelService;
     private final UserService userService;
+    private final ReadStatusService readStatusService;
 
     public JCFMessageService(
             MessageRepository messageRepository,
             ChannelService channelService,
-            UserService userService
+            UserService userService,
+            ReadStatusService readStatusService
     ) {
         this.messageRepository = messageRepository;
         this.channelService = channelService;
         this.userService = userService;
+        this.readStatusService = readStatusService;
     }
 
     @Override
     public MessageResponseDto createMessage(CreateMessageRequestDto requestDto) {
-        User sender = userService.findOneByIdOrThrow(requestDto.userId());
+        User sender = userService.findOneByUserIdOrThrow(requestDto.userId());
         Channel destinationChannel = channelService.findOneByChannelIdOrThrow(requestDto.destinationChannelId());
         Message createMessage = messageRepository.save(new Message(sender, destinationChannel, requestDto.content()));
         return MessageResponseDto.from(createMessage);
@@ -41,23 +45,24 @@ public MessageResponseDto createMessage(CreateMessageRequestDto requestDto) {
 
     @Override
     public void updateMessage(UUID userId, UpdateMessageContentRequestDto requestDto) {
-        User foundUser = userService.findOneByIdOrThrow(userId);
-        Message foundMessage = findOneByIdOrThrow(requestDto.messageId());
+        User foundUser = userService.findOneByUserIdOrThrow(userId);
+        Message foundMessage = findOneByMessageIdOrThrow(requestDto.messageId());
         throwIsNotSender(foundUser, foundMessage);
         foundMessage.updateContent(requestDto.content());
+        readStatusService.updateLastReadTime(foundUser, foundMessage.getDestinationChannel());
         messageRepository.save(foundMessage);
     }
 
     @Override
     public void deleteMessage(UUID userId, DeleteMessageRequestDto requestDto) {
-        User foundUser = userService.findOneByIdOrThrow(userId);
-        Message foundMessage = findOneByIdOrThrow(requestDto.messageId());
+        User foundUser = userService.findOneByUserIdOrThrow(userId);
+        Message foundMessage = findOneByMessageIdOrThrow(requestDto.messageId());
         throwIsNotSender(foundUser, foundMessage);
         messageRepository.deleteById(foundMessage.getId());
     }
 
     @Override
-    public Message findOneByIdOrThrow(UUID messageId) {
+    public Message findOneByMessageIdOrThrow(UUID messageId) {
         return messageRepository.findById(messageId)
                 .orElseThrow(() -> new MessageNotFoundException(ErrorCode.NOT_FOUND));
     }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/readstatus/ReadStatusService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/readstatus/ReadStatusService.java
index 80937c91f..c53b86a26 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/readstatus/ReadStatusService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/readstatus/ReadStatusService.java
@@ -1,15 +1,14 @@
 package com.sprint.mission.discodeit.application.service.readstatus;
 
-import com.sprint.mission.discodeit.application.dto.readstatus.ReadStatusUpdateRequestDto;
 import com.sprint.mission.discodeit.application.service.interfaces.ChannelService;
 import com.sprint.mission.discodeit.application.service.interfaces.UserService;
 import com.sprint.mission.discodeit.domain.channel.Channel;
 import com.sprint.mission.discodeit.domain.readStatus.ReadStatus;
 import com.sprint.mission.discodeit.domain.user.User;
+import com.sprint.mission.discodeit.global.error.ErrorCode;
+import com.sprint.mission.discodeit.global.error.exception.EntityNotFoundException;
 import com.sprint.mission.discodeit.repository.readstatus.interfaces.ReadStatusRepository;
 import java.time.Instant;
-import java.util.Optional;
-import java.util.UUID;
 
 public class ReadStatusService {
 
@@ -27,15 +26,10 @@ public ReadStatusService(
         this.channelService = channelService;
     }
 
-    public void updateLastReadTime(UUID userId, ReadStatusUpdateRequestDto requestDto) {
-        User foundUser = userService.findOneByIdOrThrow(userId);
-        Channel foundChannel = channelService.findOneByChannelIdOrThrow(requestDto.channelId());
-        ReadStatus readStatus = findOneByUserIdAndChannelId(foundUser, foundChannel).orElseGet(() -> new ReadStatus(foundUser, foundChannel));
+    public void updateLastReadTime(User user, Channel channel) {
+        ReadStatus readStatus = readStatusRepository.findOneByUserIdAndChannelId(user, channel)
+                .orElseThrow(() -> new EntityNotFoundException(ErrorCode.NOT_FOUND));
         readStatus.updateLastReadAt(Instant.now());
         readStatusRepository.save(readStatus);
     }
-
-    public Optional<ReadStatus> findOneByUserIdAndChannelId(User foundUser, Channel foundChannel) {
-        return readStatusRepository.findOneByUserIdAndChannelId(foundUser, foundChannel);
-    }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/JCFUserService.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/JCFUserService.java
index 310051130..afa3820c3 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/JCFUserService.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/application/service/user/JCFUserService.java
@@ -5,7 +5,6 @@
 import com.sprint.mission.discodeit.application.dto.user.LoginRequestDto;
 import com.sprint.mission.discodeit.application.dto.user.UserResponseDto;
 import com.sprint.mission.discodeit.application.dto.user.joinUserRequestDto;
-import com.sprint.mission.discodeit.application.service.interfaces.ChannelService;
 import com.sprint.mission.discodeit.application.service.interfaces.UserService;
 import com.sprint.mission.discodeit.application.service.user.converter.UserConverter;
 import com.sprint.mission.discodeit.application.service.userstatus.UserStatusService;
@@ -72,7 +71,7 @@ public void login(LoginRequestDto requestDto) {
     }
 
     @Override
-    public User findOneByIdOrThrow(UUID uuid) {
+    public User findOneByUserIdOrThrow(UUID uuid) {
         return userRepository.findOneById(uuid)
                 .orElseThrow(() -> new UserNotFoundException(ErrorCode.NOT_FOUND));
     }
@@ -91,14 +90,14 @@ public List<UserResponseDto> findAll() {
     @Override
     public void changePassword(UUID userId, ChangePasswordRequestDto requestDto) {
         PasswordValidator.validateOrThrow(requestDto.password());
-        User foundUser = findOneByIdOrThrow(userId);
+        User foundUser = findOneByUserIdOrThrow(userId);
         foundUser.updatePassword(passwordEncoder.encode(requestDto.password()));
         userRepository.save(foundUser);
     }
 
     @Override
     public void quitUser(UUID userId) {
-        User foundUser = findOneByIdOrThrow(userId);
+        User foundUser = findOneByUserIdOrThrow(userId);
         List<Channel> channels = channelRepository.findAllByUserId(userId);
         channels.forEach(channel -> channel.quitChannel(foundUser));
         userStatusService.delete(foundUser);
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/message/Message.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/message/Message.java
index a479c0f46..7c8fcbedd 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/message/Message.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/message/Message.java
@@ -63,6 +63,10 @@ public UUID getDestinationChannelId() {
         return destinationChannel.getId();
     }
 
+    public Channel getDestinationChannel() {
+        return destinationChannel;
+    }
+
     @Override
     public boolean equals(Object o) {
         if (this == o) {

From bf4d325a24d3399be6fc512b70c51affd79ed08a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EB=B0=B1=EC=9E=AC=EC=9A=B0?=
 <157946706+jaewoo9797@users.noreply.github.com>
Date: Tue, 11 Feb 2025 18:08:09 +0900
Subject: [PATCH 38/38] =?UTF-8?q?refactor:=20=EC=A4=84=EB=B0=94=EA=BF=88,?=
 =?UTF-8?q?=20=EC=9E=98=EB=AA=BB=EB=90=9C=20=ED=81=B4=EB=9E=98=EC=8A=A4=20?=
 =?UTF-8?q?=EC=9D=B4=EB=A6=84=20=EC=88=98=EC=A0=95?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../com/sprint/mission/discodeit/domain/channel/Channel.java    | 1 +
 .../mission/discodeit/domain/channel/ParticipatedUser.java      | 2 +-
 .../com/sprint/mission/discodeit/domain/user/BirthDate.java     | 1 +
 ...annelInMemoryRepository.java => UserInMemoryRepository.java} | 2 +-
 4 files changed, 4 insertions(+), 2 deletions(-)
 rename codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/{ChannelInMemoryRepository.java => UserInMemoryRepository.java} (96%)

diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java
index ff5fa5dc3..5f962c8a7 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/Channel.java
@@ -67,6 +67,7 @@ public void updateSubject(String subject) {
         this.subject = subject;
     }
 
+
     public void updateName(String name) {
         this.name = name.trim();
     }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/ParticipatedUser.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/ParticipatedUser.java
index 721ce8761..f11180227 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/ParticipatedUser.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/channel/ParticipatedUser.java
@@ -20,6 +20,6 @@ public void removeUser(User user) {
     }
 
     public Set<UUID> getParticipatedUserId() {
-        return Collections.unmodifiableSet(users.keySet());
+        return Set.copyOf(users.keySet());
     }
 }
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/BirthDate.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/BirthDate.java
index f992b0c9b..d27ee4008 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/BirthDate.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/domain/user/BirthDate.java
@@ -6,6 +6,7 @@
 import java.util.Objects;
 
 public class BirthDate {
+
     private static final int MIN_AGE_RESTRICT = 13;
 
     private final LocalDate value;
diff --git a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/ChannelInMemoryRepository.java b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/UserInMemoryRepository.java
similarity index 96%
rename from codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/ChannelInMemoryRepository.java
rename to codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/UserInMemoryRepository.java
index 2f9c79bef..5d94547d8 100644
--- a/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/ChannelInMemoryRepository.java
+++ b/codeit-bootcamp-spring/1-sprint-mission/src/main/java/com/sprint/mission/discodeit/repository/user/UserInMemoryRepository.java
@@ -12,7 +12,7 @@
 import org.springframework.stereotype.Repository;
 
 @Repository
-public class ChannelInMemoryRepository implements UserRepository {
+public class UserInMemoryRepository implements UserRepository {
 
     Map<UUID, User> uuidUsers = new HashMap<>();
     Map<Email, User> emailUsers = new HashMap<>();