스프린트 미션 #2 제출 PR

[usnack522]

질문 1

DiscodeitLayeredJavaApplication 테스트가 잘 실행되지 않아요. 무엇이 문제인지 잘 모르겠습니다.
로그를 보면 유저 등록과 카테고리 등록까지는 성공한 것 같은데 그 다음에 왜 에러가 발생하는지 잘 모르겠어요.

에러로그

Created User1: User{id=c11d305d-fea8-4839-9e37-04551ec6de82, username='woody', email='[email protected]', password='woody1234', avatarUrl='https://lumiere-a.akamaihd.net/v1/images/open-uri20150422-20810-10n7ovy_9b42e613.jpeg', createdAt=2024-11-18T15:37:00.636242}
Created User2: User{id=3608444a-9bb8-498b-abfa-c1e88eeb42cf, username='buzz', email='[email protected]', password='buzz1234', avatarUrl='https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRSr8RwnYAsvEYAvc199pUF6AIYE6CIRBNVGg&s', createdAt=2024-11-18T15:37:00.652885}
Created Category: Category{id=fdf375e0-2ba2-40f0-ae7a-772555d684bd, name='favorite', createdAt=2024-11-18T15:37:00.654341}
3 actionable tasks: 2 executed, 1 up-to-date
java.io.NotSerializableException: com.sprint.mission.discodeit.model.User
	at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1200)
	at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:358)
	at java.base/java.util.HashMap.internalWriteEntries(HashMap.java:1952)
	at java.base/java.util.HashMap.writeObject(HashMap.java:1505)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at java.base/java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1072)
	at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1529)
	at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1451)
	at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1194)
	at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:358)
	at com.sprint.mission.discodeit.repository.file.FileUserRepository.save(FileUserRepository.java:66)
	at com.sprint.mission.discodeit.repository.file.FileUserRepository.save(FileUserRepository.java:40)
	at com.sprint.mission.discodeit.service.basic.BasicUserService.createUser(BasicUserService.java:22)
	at com.sprint.mission.discodeit.DiscodeitLayeredJavaApplication.setUpUsers(DiscodeitLayeredJavaApplication.java:14)
	at com.sprint.mission.discodeit.DiscodeitLayeredJavaApplication.main(DiscodeitLayeredJavaApplication.java:54)
java.io.NotSerializableException: com.sprint.mission.discodeit.model.User
	at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1200)
	at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:358)
	at java.base/java.util.HashMap.internalWriteEntries(HashMap.java:1952)
	at java.base/java.util.HashMap.writeObject(HashMap.java:1505)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at java.base/java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1072)
	at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1529)
	at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1451)
	at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1194)
	at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:358)
	at com.sprint.mission.discodeit.repository.file.FileUserRepository.save(FileUserRepository.java:66)
	at com.sprint.mission.discodeit.repository.file.FileUserRepository.save(FileUserRepository.java:40)
	at com.sprint.mission.discodeit.service.basic.BasicUserService.createUser(BasicUserService.java:22)
	at com.sprint.mission.discodeit.DiscodeitLayeredJavaApplication.setUpUsers(DiscodeitLayeredJavaApplication.java:16)
	at com.sprint.mission.discodeit.DiscodeitLayeredJavaApplication.main(DiscodeitLayeredJavaApplication.java:54)
java.io.NotSerializableException: com.sprint.mission.discodeit.model.Category
	at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1200)
	at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:358)
	at java.base/java.util.HashMap.internalWriteEntries(HashMap.java:1952)
	at java.base/java.util.HashMap.writeObject(HashMap.java:1505)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at java.base/java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1072)
	at java.base/java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1529)
	at java.base/java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1451)
	at java.base/java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1194)
	at java.base/java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:358)
	at com.sprint.mission.discodeit.repository.file.FileCategoryRepository.save(FileCategoryRepository.java:65)
	at com.sprint.mission.discodeit.repository.file.FileCategoryRepository.save(FileCategoryRepository.java:39)
	at com.sprint.mission.discodeit.service.basic.BasicCategoryService.createCategory(BasicCategoryService.java:22)
	at com.sprint.mission.discodeit.DiscodeitLayeredJavaApplication.setUpCategory(DiscodeitLayeredJavaApplication.java:24)
	at com.sprint.mission.discodeit.DiscodeitLayeredJavaApplication.main(DiscodeitLayeredJavaApplication.java:55)
Exception in thread "main" java.util.NoSuchElementException: Category with id fdf375e0-2ba2-40f0-ae7a-772555d684bd not found
	at com.sprint.mission.discodeit.service.basic.BasicChannelService.createChannel(BasicChannelService.java:28)
	at com.sprint.mission.discodeit.DiscodeitLayeredJavaApplication.channelTest(DiscodeitLayeredJavaApplication.java:30)
	at com.sprint.mission.discodeit.DiscodeitLayeredJavaApplication.main(DiscodeitLayeredJavaApplication.java:58)

질문 2

BasicService와 FileService의 차이점이 무엇인가요?