Based on JBM 1.4 documentation, the jar needed for remote client is: jboss-aop.jar jboss-remoting.jar jbossall-client.jar jboss-messaging-client.jar jboss-mdr.jar <- I had to add this one to get the signature class javassist.jar trove.jar (http://www.jboss.org/file-access/default/members/jbossmessaging/freezone/...) I included the jars in the order above and verified all the jars are in the right version. (JBoss 4.3.0GA) However, I am still getting the same exception. Any help would be appreciated. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4224375#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...