26강 오류

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안녕하세요! 강의 너무 잘 듣고 있습니다. 26강을 따라하던 중, 다음과 같은 에러가 났는데 혼자서 해결이 되지 않아 질문 드립니다. 어떤 코드를 복붙해야할지 모르겠어서 일단 에러메시지만 복사하였습니다! 감사합니다..!! <추가 07.18. 오후 12시> User.java 에 @Entity 어노테이션이 빠져 있어서 추가를 하니 문제가 해결되었습니다. 문제는 해결되었으나, 에러 메시지 해석이 너무 어려워서 이점만 도움을 주시면 감사하겠습니다!! 2023-07-18 01:41:59.121 ERROR 8616 --- [ main] o.s.boot.SpringApplication : Application run failed org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userController' defined in file [C:\Users\1876007\Desktop\study\library-app\build\classes\java\main\com\group\libraryapp\controller\user\UserController.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userServiceV2' defined in file [C:\Users\1876007\Desktop\study\library-app\build\classes\java\main\com\group\libraryapp\service\UserServiceV2.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRepository' defined in com.group .libraryapp.domain.user.UserRepository defined in @EnableJpaRepositories declared on JpaRepositoriesRegistrar.EnableJpaRepositoriesConfiguration: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: class com.group .libraryapp.domain.user.User at org.springframework.beans.factory.support .ConstructorResolver.createArgumentArray( ConstructorResolver.java:800 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .ConstructorResolver.autowireConstructor( ConstructorResolver.java:229 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .AbstractAutowireCapableBeanFactory.autowireConstructor( AbstractAutowireCapableBeanFactory.java:1372 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .AbstractAutowireCapableBeanFactory.createBeanInstance( AbstractAutowireCapableBeanFactory.java:1222 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .AbstractAutowireCapableBeanFactory.doCreateBean( AbstractAutowireCapableBeanFactory.java:582 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .AbstractAutowireCapableBeanFactory.createBean( AbstractAutowireCapableBeanFactory.java:542 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .AbstractBeanFactory.lambda$doGetBean$0( AbstractBeanFactory.java:335 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .DefaultSingletonBeanRegistry.getSingleton( DefaultSingletonBeanRegistry.java:234 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .AbstractBeanFactory.doGetBean( AbstractBeanFactory.java:333 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .AbstractBeanFactory.getBean( AbstractBeanFactory.java:208 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .DefaultListableBeanFactory.preInstantiateSingletons( DefaultListableBeanFactory.java:955 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.context.support .AbstractApplicationContext.finishBeanFactoryInitialization( AbstractApplicationContext.java:918 ) ~[spring-context-5.3.24.jar:5.3.24] at org.springframework.context.support .AbstractApplicationContext.refresh( AbstractApplicationContext.java:583 ) ~[spring-context-5.3.24.jar:5.3.24] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh( ServletWebServerApplicationContext.java:147 ) ~[spring-boot-2.7.6.jar:2.7.6] at org.springframework.boot.SpringApplication.refresh( SpringApplication.java:731 ) ~[spring-boot-2.7.6.jar:2.7.6] at org.springframework.boot.SpringApplication.refreshContext( SpringApplication.java:408 ) ~[spring-boot-2.7.6.jar:2.7.6] at org.springframework.boot.SpringApplication.run ( SpringApplication.java:307 ) ~[spring-boot-2.7.6.jar:2.7.6] at org.springframework.boot.SpringApplication.run ( SpringApplication.java:1303 ) ~[spring-boot-2.7.6.jar:2.7.6] at org.springframework.boot.SpringApplication.run ( SpringApplication.java:1292 ) ~[spring-boot-2.7.6.jar:2.7.6] at com.group .libraryapp.LibraryAppApplication.main( LibraryAppApplication.java:10 ) ~[main/:na] Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userServiceV2' defined in file [C:\Users\1876007\Desktop\study\library-app\build\classes\java\main\com\group\libraryapp\service\UserServiceV2.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRepository' defined in com.group .libraryapp.domain.user.UserRepository defined in @EnableJpaRepositories declared on JpaRepositoriesRegistrar.EnableJpaRepositoriesConfiguration: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: class com.group .libraryapp.domain.user.User at org.springframework.beans.factory.support .ConstructorResolver.createArgumentArray( ConstructorResolver.java:800 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .ConstructorResolver.autowireConstructor( ConstructorResolver.java:229 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .AbstractAutowireCapableBeanFactory.autowireConstructor( AbstractAutowireCapableBeanFactory.java:1372 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .AbstractAutowireCapableBeanFactory.createBeanInstance( AbstractAutowireCapableBeanFactory.java:1222 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .AbstractAutowireCapableBeanFactory.doCreateBean( AbstractAutowireCapableBeanFactory.java:582 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .AbstractAutowireCapableBeanFactory.createBean( AbstractAutowireCapableBeanFactory.java:542 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .AbstractBeanFactory.lambda$doGetBean$0( AbstractBeanFactory.java:335 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .DefaultSingletonBeanRegistry.getSingleton( DefaultSingletonBeanRegistry.java:234 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .AbstractBeanFactory.doGetBean( AbstractBeanFactory.java:333 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .AbstractBeanFactory.getBean( AbstractBeanFactory.java:208 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate( DependencyDescriptor.java:276 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .DefaultListableBeanFactory.doResolveDependency( DefaultListableBeanFactory.java:1391 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .DefaultListableBeanFactory.resolveDependency( DefaultListableBeanFactory.java:1311 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .ConstructorResolver.resolveAutowiredArgument( ConstructorResolver.java:887 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .ConstructorResolver.createArgumentArray( ConstructorResolver.java:791 ) ~[spring-beans-5.3.24.jar:5.3.24] ... 19 common frames omitted Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRepository' defined in com.group .libraryapp.domain.user.UserRepository defined in @EnableJpaRepositories declared on JpaRepositoriesRegistrar.EnableJpaRepositoriesConfiguration: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: class com.group .libraryapp.domain.user.User at org.springframework.beans.factory.support .AbstractAutowireCapableBeanFactory.initializeBean( AbstractAutowireCapableBeanFactory.java:1804 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .AbstractAutowireCapableBeanFactory.doCreateBean( AbstractAutowireCapableBeanFactory.java:620 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .AbstractAutowireCapableBeanFactory.createBean( AbstractAutowireCapableBeanFactory.java:542 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .AbstractBeanFactory.lambda$doGetBean$0( AbstractBeanFactory.java:335 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .DefaultSingletonBeanRegistry.getSingleton( DefaultSingletonBeanRegistry.java:234 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .AbstractBeanFactory.doGetBean( AbstractBeanFactory.java:333 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .AbstractBeanFactory.getBean( AbstractBeanFactory.java:208 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate( DependencyDescriptor.java:276 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .DefaultListableBeanFactory.doResolveDependency( DefaultListableBeanFactory.java:1391 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .DefaultListableBeanFactory.resolveDependency( DefaultListableBeanFactory.java:1311 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .ConstructorResolver.resolveAutowiredArgument( ConstructorResolver.java:887 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .ConstructorResolver.createArgumentArray( ConstructorResolver.java:791 ) ~[spring-beans-5.3.24.jar:5.3.24] ... 33 common frames omitted Caused by: java.lang.IllegalArgumentException: Not a managed type: class com.group .libraryapp.domain.user.User at org.hibernate.metamodel.internal.MetamodelImpl.managedType( MetamodelImpl.java:583 ) ~[ hibernate-core-5.6.14.Final .jar: 5.6.14.Final ] at org.hibernate.metamodel.internal.MetamodelImpl.managedType( MetamodelImpl.java:85 ) ~[ hibernate-core-5.6.14.Final .jar: 5.6.14.Final ] at org.springframework.data.jpa.repository.support .JpaMetamodelEntityInformation.( JpaMetamodelEntityInformation.java:75 ) ~[spring-data-jpa-2.7.6.jar:2.7.6] at org.springframework.data.jpa.repository.support .JpaEntityInformationSupport.getEntityInformation( JpaEntityInformationSupport.java:66 ) ~[spring-data-jpa-2.7.6.jar:2.7.6] at org.springframework.data.jpa.repository.support .JpaRepositoryFactory.getEntityInformation( JpaRepositoryFactory.java:233 ) ~[spring-data-jpa-2.7.6.jar:2.7.6] at org.springframework.data.jpa.repository.support .JpaRepositoryFactory.getTargetRepository( JpaRepositoryFactory.java:182 ) ~[spring-data-jpa-2.7.6.jar:2.7.6] at org.springframework.data.jpa.repository.support .JpaRepositoryFactory.getTargetRepository( JpaRepositoryFactory.java:165 ) ~[spring-data-jpa-2.7.6.jar:2.7.6] at org.springframework.data.jpa.repository.support .JpaRepositoryFactory.getTargetRepository( JpaRepositoryFactory.java:76 ) ~[spring-data-jpa-2.7.6.jar:2.7.6] at org.springframework.data.repository.core.support .RepositoryFactorySupport.getRepository( RepositoryFactorySupport.java:325 ) ~[spring-data-commons-2.7.6.jar:2.7.6] at org.springframework.data.repository.core.support .RepositoryFactoryBeanSupport.lambda$afterPropertiesSet$5( RepositoryFactoryBeanSupport.java:323 ) ~[spring-data-commons-2.7.6.jar:2.7.6] at org.springframework.data .util.Lazy.getNullable( Lazy.java:231 ) ~[spring-data-commons-2.7.6.jar:2.7.6] at org.springframework.data .util.Lazy.get( Lazy.java:115 ) ~[spring-data-commons-2.7.6.jar:2.7.6] at org.springframework.data.repository.core.support .RepositoryFactoryBeanSupport.afterPropertiesSet( RepositoryFactoryBeanSupport.java:329 ) ~[spring-data-commons-2.7.6.jar:2.7.6] at org.springframework.data.jpa.repository.support .JpaRepositoryFactoryBean.afterPropertiesSet( JpaRepositoryFactoryBean.java:144 ) ~[spring-data-jpa-2.7.6.jar:2.7.6] at org.springframework.beans.factory.support .AbstractAutowireCapableBeanFactory.invokeInitMethods( AbstractAutowireCapableBeanFactory.java:1863 ) ~[spring-beans-5.3.24.jar:5.3.24] at org.springframework.beans.factory.support .AbstractAutowireCapableBeanFactory.initializeBean( AbstractAutowireCapableBeanFactory.java:1800 ) ~[spring-beans-5.3.24.jar:5.3.24] ... 44 common frames omitted Process finished with exit code 1

최태현 · Answer

안녕하세요, tls021121님! 질문 올려주셔서 감사드립니다! 😊 크으~~ 잘 해결하셨군요!! 👍👍 말씀해 주신 것처럼 에러 (stack trace)를 조금 더 잘 보는 법만 공유드려 보도록 하겠습니다. 서버에서 에러가 발생하면, 굉장히 길고~ 긴 에러 로그가 남게 됩니다. 이 에러로그는 한 줄 한 줄이 코드가 실행되었던 함수 라고 생각하시면 되어요! 예를 들어, public void a() { b(); } public void b() { c(); } public void c() { // 에러 발생 } 위 코드와 같이 a -> b -> c 호출이 이뤄진다면 에러에서는 다음과 같이 보이게 됩니다. 에러 발생 + 에러 메시지 at 패키지.클래스.c(c 함수 위치) at 패키지.클래스.b(b함수 위치) at 패캐지.클래스.a(a함수 위치)   자 그리고~ 언젠가는 이 한 줄 한 줄을 살펴봐야 할 때도 있겠지만, 대부분의 경우는 우리가 작성한 코드를 위주로 확인하면 됩니다. 예를 들어, 저희 코드는 com.group 패키지 안에 있는데요! 이 길고 긴 에러에서 com.group 으로 검색을 해보는거에요! 그럼 아래 코드 정도만 남습니다. (내용이 중복이라 가장 긴 코드는 제외 했어요!!) Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userServiceV2' defined in file [C:\Users\1876007\Desktop\study\library-app\build\classes\java\main\com\group\libraryapp\service\UserServiceV2.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRepository' defined in com.group .libraryapp.domain.user.UserRepository defined in @EnableJpaRepositories declared on JpaRepositoriesRegistrar.EnableJpaRepositoriesConfiguration: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: class com.group .libraryapp.domain.user.User Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRepository' defined in com.group .libraryapp.domain.user.UserRepository defined in @EnableJpaRepositories declared on JpaRepositoriesRegistrar.EnableJpaRepositoriesConfiguration: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: class com.group .libraryapp.domain.user.User Caused by: java.lang.IllegalArgumentException: Not a managed type: class com.group .libraryapp.domain.user.User 이렇게 com.group 으로 검색을 하고~ 가장 먼저 제일 아래에 있는 에러를 확인해보시면 됩니다. 보통 아래에 있을 수록 근본 원인이기 때문에요 예를 들어, 현재 위 내용을 해석해보면 User가 managed type이 아니기 때문에 UserRepository에서 문제가 생겼고 UserRepository에서 문제가 생겨서, UserSerivceV2에서 문제가 생겼다 라고 할 수 있습니다.   따라서, 근본 원인은 가장 아래 있는 Not a managed type: class com.group.libraryapp.domain.user.User 인 거죠!! 구글에 검색 하실 때도 Not a managed type JPA 에러 라고 검색하시면 제일 빨리 찾으실 수 있을 겁니다. 잘 해결하셨듯이 not a managed type JPA는 해당 객체가 @Entity 가 붙어 있지 않아 JPA가 관리하고 있지 않다라는 뜻이에요 ㅎㅎㅎ   이 과정이 익숙해지면 에러 나오면 -> 주요 메시지만 바로~ 필터링 해서 -> 원인 바로~ 보고 -> 아 managed type 문제 -> @Entity가 빠졌네 혹은 (처음 보는 에러면 검색) 라고 금방 생각하시게 될겁니다.   답변이 도움이 되었으면 좋겠습니다. 감사합니다! 🙏🙏🙏