Exception in thread "main" org.hibernate.id.IdentifierGenerationException:

最新推荐文章于 2024-04-05 15:56:54 发布

MarioFei

最新推荐文章于 2024-04-05 15:56:54 发布

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本文探讨了在使用Hibernate进行Java持久化时遇到的OneToOne属性赋值异常问题，具体为尝试从null中生成id导致的IdentifierGenerationException，并提供了解决方案。

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Exception in thread "main" org.hibernate.id.IdentifierGenerationException: attempted to assign id from null one-to-one property: person
at org.hibernate.id.ForeignGenerator.generate(ForeignGenerator.java:68)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:122)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210)
at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:56)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195)
at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:50)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93)
at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:562)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:550)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:546)
at com.zhang.test.OneToOneTest.add(OneToOneTest.java:37)
at com.zhang.test.OneToOneTest.main(OneToOneTest.java:17)

<id name="id">
   <generator class="foreign" >
    <param name="property">person</param>
   </generator>
  </id>的话侧必须要有主类因为Idcard是依赖person的主键的所以要有idcard.setPerson(person);