[hibernate-issues] [Hibernate-JIRA] Created: (HHH-2097) LAZY property results in org.hibernate.TransientObjectException after merge

[Reto Urfer (JIRA)]

LAZY property results in org.hibernate.TransientObjectException after merge
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         Key: HHH-2097
         URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2097
     Project: Hibernate3
        Type: Bug

  Components: core  
    Versions: 3.2.0.cr4    
 Environment: Hibernate3.2 cr4 with Annotations cr2 and EntityManager cr2, Oracle10g R2, WindowsXP
    Reporter: Reto Urfer
    Priority: Critical
 Attachments: BugLazyPropertyMerge.zip

Entity1 has a property e2 which references Entity2. This property is defined as follows.
     @ManyToOne(fetch = FetchType.LAZY, optional = false)
     private Entity2 e2;

If you have an instance e1 of Entity1 which has not initialized property e2 and you merge e1 to the EntityManager within a transaction, then you get the following exception during commit:

Exception in thread "main" javax.persistence.RollbackException: Error while commiting the transaction
	at org.hibernate.ejb.TransactionImpl.commit(TransactionImpl.java:63)
	at com.test.Test.main(Test.java:42)
Caused by: org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: com.test.Entity1.e2 -> com.test.Entity2
	at org.hibernate.engine.CascadingAction$9.noCascade(CascadingAction.java:350)
	at org.hibernate.engine.Cascade.cascade(Cascade.java:139)
	at org.hibernate.event.def.AbstractFlushingEventListener.cascadeOnFlush(AbstractFlushingEventListener.java:130)
	at org.hibernate.event.def.AbstractFlushingEventListener.prepareEntityFlushes(AbstractFlushingEventListener.java:121)
	at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:65)
	at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:26)
	at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000)
	at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:338)
	at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106)
	at org.hibernate.ejb.TransactionImpl.commit(TransactionImpl.java:53)
	... 1 more


I added a small Testproject to reproduce this bug.

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