Caused by: org.hibernate.TransientObjectException: object references an unsaved transient instance -

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本文解决了一个关于Hibernate框架中关联对象未保存导致的TransientObjectException异常问题。通过检查多对一关联关系，并确保在保存或更新前正确设置关联对象值，避免了此异常的发生。

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Caused by: org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: com.cat.po.proReport.Enterprise
at org.hibernate.engine.ForeignKeys.getEntityIdentifierIfNotUnsaved(ForeignKeys.java:242)
at org.hibernate.type.EntityType.getIdentifier(EntityType.java:430)
at org.hibernate.type.ManyToOneType.isDirty(ManyToOneType.java:265)
at org.hibernate.type.TypeFactory.findDirty(TypeFactory.java:619)
at org.hibernate.persister.entity.AbstractEntityPersister.findDirty(AbstractEntityPersister.java:3151)
at org.hibernate.event.def.DefaultFlushEntityEventListener.dirtyCheck(DefaultFlushEntityEventListener.java:501)
at org.hibernate.event.def.DefaultFlushEntityEventListener.isUpdateNecessary(DefaultFlushEntityEventListener.java:227)
at org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:150)
at org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:219)
at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:99)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:49)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1027)
at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:365)
at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:137)
at org.springframework.orm.hibernate3.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:655)
... 76 more

原因是：代码中关联的对象没有set值进去。
查看代码，发现是enterPriseStrength和enterprise为多对一关联，
代码直接enterPriseStrengthDao.saveOrUpdate(enterPriseStrength);//保存或更新
保存或更新前必须将enterprise的值set进去：enterPriseStrength.setEnterprise(enterprise)
如果是空值，则也必须set：enterPriseStrength.setEnterprise(null);

set值之后保存成功~~记住，保存一个对象的时候，所有关联的对象都必须set值，否则报错。