"ataylor" wrote : i would suggest migrating to jboss 4.2.3. +1 If you really have to use JBAS 4.0.X at your client, you will have to play with classLoader isolations, and have all the JBAS 4.2 libraries on that isolated classLoader, in a way that your WEB/EAR application would behave as any other standalone application. That's a sour procedure and error prone... it's probably easier to migrate to 4.2.3. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4216966#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...