For classloading configurations, i use the jboss-app.xml approach. Haven't tried the callByValue. You mentioned that the jboss-app.xml is already present. You even posted the one from NexusEvents.ear (i guess). Can you post the other one from KeyB.ear? Just wanted to make sure that you are not using the same loader repository name in both these jboss-app.xml files. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4163930#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...