Hi! Thanks for reply! Now I have configured OptimisticTreeCacheProvider and got rid of Cannot Handle Method _put messages. But I still get those WARN messages.... | WARN [arjLoggerI18N] [com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator_4] TwoPhaseCoordinator.afterCompletion - failed for com.arjuna.ats.internal.jta.resources.arjunacore.SynchronizationImple@4 | 1dc41dc | | Any idea of what's causing them...? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4000825#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...