[hibernate-issues] [Hibernate-JIRA] Created: (HHH-2765) nonthreadsafe exception in a case where I have only the main thread

[Zied Hamdi (JIRA)]

nonthreadsafe exception in a case where I have only the main thread
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                 Key: HHH-2765
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2765
             Project: Hibernate3
          Issue Type: Bug
    Affects Versions: 3.2.3
         Environment: JPA
Hibernate 3.2.3.GA
Derby 10.2.2.0
            Reporter: Zied Hamdi
            Priority: Blocker
         Attachments: 20070802-161806 IntoJPA bug report.zip

I think it's because I do a EntityManager.clear() inside a @PreUpdate listener. But it doesn't really seam forbidden to me since em.merge can be executed on unattached objects.

I zipped all the source code, JPAMain.main() is my test case. Even though more classes are implied, I've attempted to make the code as small as possible (for what I'm trying to do).

I'll help you evolve in this bug as I can, it is really blocking to me :-/

There's an explanation of what I'm trying to do at http://forum.hibernate.org/viewtopic.php?p=2361052#2361052

here's the stack trace
Hibernate: update Person set startDate=?, endDate=?, note=?, lastOccurence=? where id=? and revision=?
2007-08-02 15:20:03,171 [main] ERROR org.hibernate.AssertionFailure.<init>(22) - an assertion failure occured (this may indicate a bug in Hibernate, but is more likely due to unsafe use of the session)
org.hibernate.AssertionFailure: possible nonthreadsafe access to session
	at org.hibernate.action.EntityUpdateAction.execute(EntityUpdateAction.java:107)
	at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:250)
	at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:234)
	at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:142)
	at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:298)
	at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
	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:54)
	at main.JPAMain.save(JPAMain.java:46)
	at main.JPAMain.main(JPAMain.java:19)
javax.persistence.RollbackException: Error while commiting the transaction
	at org.hibernate.ejb.TransactionImpl.commit(TransactionImpl.java:71)
	at main.JPAMain.save(JPAMain.java:46)
	at main.JPAMain.main(JPAMain.java:19)
Caused by: org.hibernate.AssertionFailure: possible nonthreadsafe access to session
	at org.hibernate.action.EntityUpdateAction.execute(EntityUpdateAction.java:107)
	at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:250)
	at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:234)
	at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:142)
	at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:298)
	at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
	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:54)
	... 2 more
2007-08-02 15:20:03,203 [main] INFO  org.hibernate.impl.SessionFactoryImpl.close(769) - closing
2007-08-02 15:20:03,203 [main] INFO  org.hibernate.connection.DriverManagerConnectionProvider.close(147) - cleaning up connection pool: jdbc:derby://localhost:1527/sample

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