If a naughty afterCompletion sync throws an exception, log the exception call stack ----------------------------------------------------------------------------------- Key: JBTM-1482 URL: https://issues.jboss.org/browse/JBTM-1482 Project: JBoss Transaction Manager Issue Type: Enhancement Security Level: Public(Everyone can see) Components: Transaction Core Reporter: Scott Marlow Assignee: Gytis Trikleris Priority: Minor Fix For: 5.0.0.M3 Currently, when this happens with AS, I see: {quote} 2013-02-18 16:24:43,837|WARN |[com.arjuna.ats.jta]|(ThreadId: Transaction Reaper Worker 221)|ARJUNA016029: SynchronizationImple.afterCompletion - failed for org.jboss.as.jpa.transaction.TransactionUtil$SessionSynchronization@634ef5a7 with exception: java.lang.NullPointerException {quote} From a related email conversation: {quote} Here's our Logger code: @Message(id = 16029, value = "SynchronizationImple.afterCompletion - failed for {0} with exception", format = MESSAGE_FORMAT) @LogMessage(level = WARN) public void warn_resources_arjunacore_SynchronizationImple(String arg0, @Cause() Throwable arg1); Here is where we call our logger: jtaLogger.i18NLogger.warn_resources_arjunacore_SynchronizationImple(_theSynch.toString(), e); Maybe the message should have the {1} in it, i.e. it change it like so: "SynchronizationImple.afterCompletion - failed for {0} with exception {1}" {quote}