I moved my messaging app over to EAP 4.3, and there is what I had to add to my client's classpath (beyond the JAR files for my app): jboss-eap-4.3\jboss-as\client\jbossall-client.jar jboss-eap-4.3\jboss-as\server\default\deploy\jboss-aop-jdk50.deployer\jboss-aop-jdk50.jar jboss-eap-4.3\jboss-as\client\javassist.jar jboss-eap-4.3\jboss-as\client\trove.jar jboss-eap-4.3\jboss-as\client\commons-logging.jar jboss-eap-4.3\jboss-as\client\log4j.jar View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4224488#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...