If I throw an AssertionError in afterCompletion from a Synchronization. I would expect the tx.commit() to throw an exception. Now I only get a log line: 10:04:25,459 WARN [arjLoggerI18N] [com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator_4b] TwoPhaseCoordinator.afterCompletion - failed for com.arjuna.ats.internal.jta.resources.arjunacore.SynchronizationImple@543cb1 with error java.lang.AssertionError: forcing an AssertionError in afterCompletion View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4173868#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...