You do not need to implement the LastResource. This is done for you by JBossJCA for ResourceAdapters that only support LocalTransaction (ie non XA). This is done to support enlistment LocalTransaction adapters within the scope of a global transaction (XA). To clarify, are you implementing a ResourceAdapter? It sounds like you are doing far too much in your code as JCA takes care of most of this for you. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4023627#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...