Which version of JBoss and Java do you use? anonymous wrote : However, once I define the loader-repository, my EJB 2.0 MDB fails to deploy Are you sure that this is the reason why your EJB2.0 fails to deploy? The log message does not show any "ERROR" messages. Those are just "DEBUG" messages. Do you have any other exception stacktrace in the logs? If yes, then post them here. Also, what do you see on the console when you deploy the application? Any errors? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4145289#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...