[jboss-user] [Beginners Corner] - why Session would close under stress test?

[gan.gary]

I have a JBoss under stresstest and under what condition the Session would close?

and the very first log is:
2008-09-10 09:01:40,695 WARN  [com.arjuna.ats.arjuna.logging.arjLoggerI18N] [com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator_2] TwoPhaseCoordinator.beforeCompletion - failed for null
  | org.hibernate.SessionException: Session is closed!
  | 	at org.hibernate.impl.AbstractSessionImpl.errorIfClosed(AbstractSessionImpl.java:49)
  | 	at org.hibernate.impl.SessionImpl.getActionQueue(SessionImpl.java:1817)
  | 	at org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:201)
  | 	at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:76)
  | 	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.CacheSynchronization.beforeCompletion(CacheSynchronization.java:59)
  | 	at com.arjuna.ats.internal.jta.resources.arjunacore.SynchronizationImple.beforeCompletion(SynchronizationImple.java:114)
  | 	at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.beforeCompletion(TwoPhaseCoordinator.java:247)
  | 	at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.end(TwoPhaseCoordinator.java:86)
  | 	at com.arjuna.ats.arjuna.AtomicAction.commit(AtomicAction.java:177)
  | 	at com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.commitAndDisassociate(TransactionImple.java:1389)
  | 	at com.arjuna.ats.internal.jta.transaction.arjunacore.BaseTransaction.commit(BaseTransaction.java:135)
  | 	at com.arjuna.ats.jbossatx.BaseTransactionManagerDelegate.commit(BaseTransactionManagerDelegate.java:87)
  | 	at org.jboss.resource.adapter.jms.inflow.JmsServerSession$XATransactionDemarcationStrategy.end(JmsServerSession.java:494)
  | 	at org.jboss.resource.adapter.jms.inflow.JmsServerSession.run(JmsServerSession.java:248)
  | 	at org.jboss.resource.work.WorkWrapper.execute(WorkWrapper.java:204)
  | 	at org.jboss.util.threadpool.BasicTaskWrapper.run(BasicTaskWrapper.java:275)
  | 	at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:756)
  | 	at java.lang.Thread.run(Thread.java:595)
  | 2008-09-10 09:01:40,695 ERROR [org.jboss.resource.adapter.jms.inflow.JmsServerSession] org.jboss.resource.adapter.jms.inflow.JmsServerSession at e94c75 failed to commit/rollback
  | java.lang.NullPointerException

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