Hi, I could not find exact references whether JBoss AS 4.0.5GA implement "last agent optimisation", whereby in a global transaction, there is one non-XA resource but 1 or more XA resource. Basically, I will have an XA JMS resource and a non-XA database resource. I saw some references in www.theserverside.com that JBoss AS does not implement this feature, but that reference was more than a year ago. Was also not sure whether I should be asking this in the JBoss Transactions forum or in this forum, since I'm not sure if JBoss AS 4.0.5 GA uses JBoss Transaction ( Arjuna / HP ). Thanks. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3990789#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...