Hi, I'm seeing the same issue with the recurring WARN message. I get the following warning from TwoPhaseCoordinator.afterCompletion with each iteration of an async task. Nothing obvious is failing, the warning might be in error or could be due to some misconfiguration on my part. It's been annoying during development but it would be nice to resolve it before deployment. 10:45:24,468 WARN [arjLoggerI18N] [com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator_4] TwoPhaseCoordinator.afterCo mpletion - returned failure for com.arjuna.ats.internal.jta.resources.arjunacore.SynchronizationImple@c03bcd I've added a comment to the open JIRA below with more details, please let me know if I can add anything else. http://jira.jboss.com/jira/browse/EJBTHREE-898 View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4088447#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...