I had the same Error.. On my jbossesb-server-4.5.GA, dir /jbossesb-server-4.5.GA/server/default/lib/ I paste these jars: jboss-annotations-ejb3.jar jboss-aop-jdk50.jar jboss-aspect-library-jdk50.jar jboss-ejb3.jar I take these files of my jboss-4.2.2.GA. Now my EJBProcessor works fine. I don't know why it doesn't work just with the jboss-ejb3-client.jar. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4239885#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...