Furhter debugging resulted in this observation: in other than lockmode=write, the transaction gets committed. in the lockmode=write, this is what is happening: java.lang.NullPointerException 2006-08-01 13:34:58,765 ERROR [STDERR] at org.hibernate.persister.entity.AbstractEntityPersister.lock(AbstractEntityPersister.java:1282) 2006-08-01 13:34:58,765 ERROR [STDERR] at org.hibernate.event.def.AbstractLockUpgradeEventListener.upgradeLock(AbstractLockUpgradeEventListener.java:88) 2006-08-01 13:34:58,765 ERROR [STDERR] at org.hibernate.event.def.DefaultLockEventListener.onLock(DefaultLockEventListener.java:64) 2006-08-01 13:34:58,765 ERROR [STDERR] at org.hibernate.impl.SessionImpl.fireLock(SessionImpl.java:586) 2006-08-01 13:34:58,765 ERROR [STDERR] at org.hibernate.impl.SessionImpl.lock(SessionImpl.java:578) 2006-08-01 13:34:58,765 ERROR [STDERR] at org.hibernate.ejb.AbstractEntityManagerImpl.lock(AbstractEntityManagerImpl.java:337) 2006-08-01 13:34:58,765 ERROR [STDERR] at org.jboss.ejb3.entity.TransactionScopedEntityManager.lock(TransactionScopedEntityManager.java:101) any known workarounds ? fixes ? patches or is it a wrong usage ? Thank You View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3962086#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...