nonthreadsafe exception in a case where I have only the main thread ------------------------------------------------------------------- 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 -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://opensource.atlassian.com/projects/hibernate/secure/Administrators.... - For more information on JIRA, see: http://www.atlassian.com/software/jira