We are using jboss-remoting 2.0, that has several features needed for messaging, while other components are not compatible with jboss-remoting 2.0 (aka webServices). You could try replicating that jboss-remoting.jar by the one sent by jboss-messaging.sar. Maybe that will fix the problem for you, but we can't standardize the version yet on jboss 4.0 (we are doing it on 4.2 and 5) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4034784#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...