refactor: 환경 설정 개선 및 예외 처리 리팩토링

- application.yml | active : DB 환경변수 지정, info : 환경 변수로 DB 표시
- application-dev.yml | H2 MODE=PostgreSQL 설정 추가
- GlobalExceptionHandler 보완(전체 예외 처리 관련) 및 ErrorCode 추가(입력값 유효성 검증 관련)
- mockito 의존성 제거

Author: k01zero

build.gradle

@@ -62,9 +62,6 @@ dependencies {
     // Spring Boot Test 의존성
     testImplementation 'org.springframework.boot:spring-boot-starter-test'
 
-    // Mockito 의존성
-    implementation "org.mockito:mockito-core:4.6.1"
-
     // JUnit 플랫폼 런처 (JUnit 테스트 실행)
     testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
 

src/main/java/com/sprint/mission/discodeit/exception/ErrorCode.java

@@ -5,6 +5,10 @@
 
 @Getter
 public enum ErrorCode {
+
+  // Validation 에러 추가
+  VALIDATION_FAILED(HttpStatus.NOT_FOUND, "입력값 검증에 실패했습니다."),
+
   // 유저
   USER_NOT_FOUND(HttpStatus.NOT_FOUND, "유저를 찾을 수 없습니다."), // 404
   USERNAME_ALREADY_EXISTS(HttpStatus.CONFLICT, "이미 존재하는 사용자 이름입니다."), // 409

src/main/java/com/sprint/mission/discodeit/exception/GlobalExceptionHandler.java

@@ -4,6 +4,7 @@
 import java.time.Instant;
 import java.util.HashMap;
 import java.util.Map;
+import org.springframework.expression.spel.ast.NullLiteral;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.MethodArgumentNotValidException;
@@ -12,10 +13,17 @@
 import java.time.LocalDateTime;
 import java.util.NoSuchElementException;
 import org.springframework.web.bind.annotation.RestControllerAdvice;
+import org.springframework.web.servlet.View;
 
 @RestControllerAdvice
 public class GlobalExceptionHandler {
 
+  private final View error;
+
+  public GlobalExceptionHandler(View error) {
+    this.error = error;
+  }
+
   // DiscodeitException 을 처리하는 핸들러
   @ExceptionHandler(DiscodeitException.class)
   public ResponseEntity<ErrorResponse> handleDiscodeitException(DiscodeitException ex) {
@@ -44,7 +52,7 @@ public ResponseEntity<ErrorResponse> handleDiscodeitException(DiscodeitException
       "status": 400
     }
    */
-  // MethodArgumentNotValidException 을 처리하는 핸들러
+  // MethodArgumentNotValidException (Spring 입력 값 검증 예외) 을 처리하는 핸들러
   @ExceptionHandler(MethodArgumentNotValidException.class)
   public ResponseEntity<ErrorResponse> handleValidationExceptions(
       MethodArgumentNotValidException ex) {
@@ -57,13 +65,58 @@ public ResponseEntity<ErrorResponse> handleValidationExceptions(
 
     ErrorResponse errorResponse = new ErrorResponse(
         Instant.now(),
-        "VALIDATION_FAILED", // ErrorCoud Enum 의 코드명과 동일하게
-        "입력값이 유효하지 않습니다.",
+        ErrorCode.VALIDATION_FAILED.name(),
+        ErrorCode.VALIDATION_FAILED.getMessage(),
         errors,
         ex.getClass().getSimpleName(), // 예외 클래스 이름
         HttpStatus.BAD_REQUEST.value()
     );
     return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(errorResponse);
   }
 
+
+  // NullPointerException 를 처리하는 핸들러
+  @ExceptionHandler(NullPointerException.class)
+  public ResponseEntity<ErrorResponse> handleNullPointerException(NullPointerException ex) {
+    ErrorResponse errorResponse = new ErrorResponse(
+        Instant.now(),
+        "NULL_POINTER_EXCEPTION",
+        "예상치 못한 null이 발생했습니다.",
+        null,
+        ex.getClass().getSimpleName(),
+        HttpStatus.INTERNAL_SERVER_ERROR.value()
+    );
+    return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(errorResponse);
+  }
+
+  // IllegalArgumentException 를 처리하는 핸들러
+  @ExceptionHandler(IllegalArgumentException.class)
+  public ResponseEntity<ErrorResponse> handleIllegalArgumentException(IllegalArgumentException ex) {
+    ErrorResponse errorResponse = new ErrorResponse(
+        Instant.now(),
+        "ILLEGAL_ARGUMENT_EXCEPTION",
+        "허용되지 않은 값입니다.",
+        null,
+        ex.getClass().getSimpleName(),
+        HttpStatus.BAD_REQUEST.value()
+    );
+    return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(errorResponse);
+  }
+
+  // 모든 예외를 처리하는 핸들러
+  @ExceptionHandler({Exception.class, RuntimeException.class})
+  public ResponseEntity<ErrorResponse> handleGeneralExceptions(Exception ex) {
+
+    ErrorResponse errorResponse = new ErrorResponse(
+        Instant.now(),
+        "UNKNOWN_ERROR",
+        "알 수 없는 오류가 발생했습니다.",
+        null,
+        ex.getClass().getSimpleName(),
+        HttpStatus.INTERNAL_SERVER_ERROR.value()
+    );
+
+    return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(errorResponse);
+  }
+
 }

src/main/resources/application-dev.yaml

@@ -1,6 +1,6 @@
 spring:
   datasource:
-    url: jdbc:h2:mem:devDB
+    url: jdbc:h2:mem:devDB;MODE=PostgreSQL # PostgreSQL 호환 모드 추가
     username: devUser
     password: devPass
     driver-class-name: org.h2.Driver  # 명시적으로 드라이버 클래스 지정

src/main/resources/application.yaml

@@ -8,13 +8,12 @@ spring:
   jpa:
     show-sql: true
 
-
   servlet:
     multipart:
       max-file-size: 10MB # 파일 하나의 최대 크기
-      max-request-size: 20MB # 한 벙네 최대 업로드 가능 용량
+      max-request-size: 20MB # 한 번에 최대 업로드 가능 용량
   profiles:
-    active: test
+    active: ${SPRING_PROFILES_ACTIVE:test}
 
 discodeit:
   storage:
@@ -56,12 +55,9 @@ info:
     java-version: 17
     spring-boot-version: 3.4.0
 
-  jpa:
-    ddl-auto: validate
-
-  multipart:
-    max-file-size: 10MB
-    max-request-size: 20MB
+  datasource:
+    url: ${spring.datasource.url}
+    driver-class-name: ${spring.datasource.driver-class-name}
 
 
 springdoc:

src/test/java/com/sprint/mission/discodeit/repository/MessageRepositoryTest.java

@@ -12,19 +12,18 @@
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
-import org.junit.jupiter.api.extension.ExtendWith;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.jdbc.AutoConfigureTestDatabase;
 import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
 import org.springframework.context.annotation.Import;
 import org.springframework.data.domain.Sort;
-import org.springframework.test.context.junit.jupiter.SpringExtension;
 
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.PageRequest;
 import org.springframework.data.domain.Pageable;
 
 @Import(JpaConfig.class)
-@ExtendWith(SpringExtension.class) // Junit5 + Spring
+@AutoConfigureTestDatabase
 @DataJpaTest
 public class MessageRepositoryTest {
 

src/test/java/com/sprint/mission/discodeit/repository/UserRepositoryTest.java

@@ -6,14 +6,13 @@
 import com.sprint.mission.discodeit.entity.User;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
-import org.junit.jupiter.api.extension.ExtendWith;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.jdbc.AutoConfigureTestDatabase;
 import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
 import org.springframework.context.annotation.Import;
-import org.springframework.test.context.junit.jupiter.SpringExtension;
 
 @Import(JpaConfig.class)
-@ExtendWith(SpringExtension.class) // Junit5 + Spring
+@AutoConfigureTestDatabase
 @DataJpaTest // JPA 와 연관된 Bean 만 로딩
 public class UserRepositoryTest {