The installer is not supposed to copy jboss-remoting.jar in lib, since in JBoss 4.0.5, Messaging is scoped. You probably refer to http://jira.jboss.org/jira/browse/JBMESSAGING-682 which was closed as "Won't Fix". Besides, before release, we run smoke tests that independenty perform the installation procedure and verify if the result is functional. Replacing lib/jboss-remoting.jar manually will break things even worse. Most likely, you're not using the right jboss-messaging-client.jar in your client path. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4003518#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...