I suspect that something in your app (the mbean or the web app?) is specifying a loader repository. There is a web service example in the examples that demonstrates a web service sending a message via JBM. If you look at this example and see how it differs from your non functioning web service, it might give you some clues as to what the problem might be. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4051001#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...