Hi again I don't know if this will help, but in those error cases the SessionAspect.handlePreDeliver() called isXAAndConsideredNonTransacted(state) which returns true because the SessionState.sessionListener is null !?! The Comment of isXAAnd.... sais: http://jira.jboss.org/jira/browse/JBMESSAGING-946 - To accomodate TCK and the MQ behavior we should behave as non transacted, AUTO_ACK when there is no transaction enlisted However when the Session is being used by ASF we should consider the case where we will convert LocalTX to GlobalTransactions. This function helper will ensure the condition that needs to be tested on this aspect Don't know why and what this is all about... Greets Markus View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4081662#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...