인프런 커뮤니티 질문&답변

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[질문 템플릿]
1. 강의 내용과 관련된 질문인가요? (예/아니오)
2. 인프런의 질문 게시판과 자주 하는 질문에 없는 내용인가요? (예/아니오)
3. 질문 잘하기 메뉴얼을 읽어보셨나요? (예/아니오)

[질문 내용]
여기에 질문 내용을 남겨주세요.

 

<dependencies>
    <!-- H2 데이터베이스-->
    <dependency>
        <groupId>com.h2database</groupId>
        <artifactId>h2</artifactId>
        <version>2.0.202</version>
    </dependency>
    <!-- JPA 하이버네이트-->
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-entitymanager</artifactId>
        <version>5.6.1.Final</version>
    </dependency>
</dependencies>

@Entity
public class Member {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
...
}

public class EntityMapping {
    public static void main(String[] args) {
        EntityManagerFactory emf = Persistence.createEntityManagerFactory("hello");
        EntityManager em = emf.createEntityManager();
        EntityTransaction tx = em.getTransaction();

        tx.begin();
        try{
            Member member = new Member();;
            member.setUsername("AAA");
            em.persist(member);
            
            tx.commit();

        }catch(Exception e){
            tx.rollback();
            e.printStackTrace();
        }finally {
            em.close();
        }
        emf.close();
    }
}

실행하면 콘솔에서

Hibernate: drop table if exists Member CASCADE Hibernate: create table Member ( id bigint generated by default as identity, name varchar(255) not null, primary key (id) )

와 같이 테이블이 생성되고

Hibernate: 

    /* insert hellojpa.Member

        */ insert 

        into

            Member

            (id, name) 

        values

 

          (null, ?)

insert 쿼리는 위와 같이 데이터베이스로 호출하는것이 보입니다.

 

[오류로그]

12월 23, 2021 10:44:53 오후 org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions

ERROR: NULL not allowed for column "ID"; SQL statement:

/* insert hellojpa.Member */ insert into Member (id, name) values (null, ?) [23502-202]

javax.persistence.PersistenceException: org.hibernate.exception.ConstraintViolationException: could not execute statement

at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:154)

at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:181)

at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:188)

at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:780)

at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:760)

at hellojpa.EntityMapping.main(EntityMapping.java:18)

Caused by: org.hibernate.exception.ConstraintViolationException: could not execute statement

at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:59)

at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:37)

at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:113)

at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:99)

at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:200)

at org.hibernate.dialect.identity.GetGeneratedKeysDelegate.executeAndExtract(GetGeneratedKeysDelegate.java:57)

at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:43)

at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3279)

at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3885)

at org.hibernate.action.internal.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:84)

at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:645)

at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:282)

at org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:263)

at org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:317)

at org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction(AbstractSaveEventListener.java:330)

at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:287)

at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:193)

at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:123)

at org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:185)

at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:128)

at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:55)

at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:107)

at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:774)

... 2 more

Caused by: org.h2.jdbc.JdbcSQLIntegrityConstraintViolationException: NULL not allowed for column "ID"; SQL statement:

 

/* insert hellojpa.Member */ insert into Member (id, name) values (null, ?) [23502-202]

null이 들어 갈수 없다고 나오는데 강의중에는 어떻게 오류가 안나고 되는지 궁금합니다.