Hibernate Annotatoin - 如何加入具有多对多关系的三个表

• 我有3个实体USER，APPLICATION和ROLE .

• 我希望在名为USER_APP_ROLE（user_ID，application_ID，role_ID）的表中加入ID，它们之间有多对多的关系 .

• 原因我想要这个结构 - 我要求允许用户处理具有多个角色的多个应用程序 .

• 我做了以下代码：

User.java @ManyToMany（targetEntity = Role.class）@JoinTable（name =“USER_APPLICATION_ROLE”，joinColumns = @ JoinColumn（name =“USER_ID”），inverseJoinColumns = @ JoinColumn（name =“ROLE_ID”））私人收藏角色;

@ManyToMany (targetEntity=Application.class)
  @JoinTable(name="USER_APPLICATION_ROLE",
  joinColumns=@JoinColumn(name="USER_ID"),
  inverseJoinColumns=@JoinColumn(name="APPLICATION_ID"))
  private Collection<Application> applications;

  Role.java
  @ManyToMany(mappedBy="roles", targetEntity=User.class)
  private Collection<User> users = new ArrayList<User>();

  Application.java
  @ManyToMany(mappedBy="applications", targetEntity=User.class)
  private Collection<User> users = new ArrayList<User>();

• 当我尝试运行以下测试时：

. user.getRoles（）添加（基于role1）; . user.getRoles（）添加（基于role2）;

. role1.getUsers（）添加（用户）; . role1.getUsers（）添加（用户）;

. role2.getUsers（）添加（用户）; . role2.getUsers（）添加（用户）;

. user.getApplications（）添加（APP1）; . user.getApplications（）添加（APP2）;

. app1.getUsers（）添加（用户）; . app2.getUsers（）添加（用户）;

......

session.beginTransaction（）; session.save（用户）; session.save（基于role1）; session.save（role2所）; session.save（APP1）; session.save（APP2）;

I get the following error:



      Hibernate: select seq_cm_user.nextval from dual
       Hibernate: select seq_role.nextval from dual
Hibernate: select seq_role.nextval from dual
Hibernate: select seq_application.nextval from dual
Hibernate: select seq_application.nextval from dual
Hibernate: insert into CM_USER (EMAIL, FIRST_NAME, LAST_NAME, MIDDLE_NAME, USERNAME, ID) values (?, ?, ?, ?, ?, ?)
Hibernate: insert into CM_ROLE (DESCRIPTION, ID) values (?, ?)
Hibernate: insert into CM_ROLE (DESCRIPTION, ID) values (?, ?)
Hibernate: insert into CM_APPLICATION (CODE, DESCRIPTION, ID) values (?, ?, ?)
Hibernate: insert into CM_APPLICATION (CODE, DESCRIPTION, ID) values (?, ?, ?)
Hibernate: insert into USER_APPLICATION_ROLE (USER_ID, APPLICATION_ID) values (?, ?)
Hibernate: insert into USER_APPLICATION_ROLE (USER_ID, APPLICATION_ID) values (?, ?)
Exception in thread "main" org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update
    at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:96)
    at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
    at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:275)
    at org.hibernate.jdbc.AbstractBatcher.prepareStatement(AbstractBatcher.java:114)
    at org.hibernate.jdbc.AbstractBatcher.prepareStatement(AbstractBatcher.java:109)
    at org.hibernate.jdbc.AbstractBatcher.prepareBatchStatement(AbstractBatcher.java:244)
    at org.hibernate.persister.collection.AbstractCollectionPersister.recreate(AbstractCollectionPersister.java:1179)
    at org.hibernate.action.CollectionRecreateAction.execute(CollectionRecreateAction.java:58)
    at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:273)
    at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:265)
    at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:188)
    at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)
    at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:51)
    at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1216)
    at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:383)
    at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:133)
    at com.hp.gdas.capman.HibernateTest.main(HibernateTest.java:73)
Caused by: java.sql.BatchUpdateException: ORA-01400: cannot insert NULL into ("SYSTEM"."USER_APPLICATION_ROLE"."ROLE_ID")

    at oracle.jdbc.driver.DatabaseError.throwBatchUpdateException(DatabaseError.java:343)
    at oracle.jdbc.driver.OraclePreparedStatement.executeBatch(OraclePreparedStatement.java:10657)
    at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:70)
    at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:268)
    ... 14 more

6.我可能在错误的方向上这样做 . 如果我完全以错误的方式做，请帮助并建议我任何替代方案 . 感谢任何帮助 .

谢谢 .