Since you are implementing the XAResource interface, there is no reason to implement the LastResource interface as well. Again, this interface is used by JBossJCA internally to manage resources that are not XA aware but still need to participate in a global transaction. It is simply a marker interface. Your implementation of XAResource should be sufficient for your needs. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4023671#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...