"adrian(a)jboss.org" wrote : "dimitris(a)jboss.org" wrote : | | The other way round (4.2.x client accessing 5.0.x server) is working. | | Not for me it isn't. ;-) | See above. But if I compile the NamingServer_stub for JBoss5 and add it the server/xxx/lib then both are happy. That's because the stub classes are different (not the same interfaces) in the two different versions. So the short answer is that dynamic proxies can't work if you change the interfaces of your Remote object. ;-) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4191266#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...