I'm afraid in my experience getting the libraries loaded correctly in different app servers (or even different versions of the same app server) is a "black art". If there are libraries which should be shared accross multiple applications (or multiple ear packages) then it is worth giving serious thought to putting those libraries into a shared location - the serverconfig/lib directory in jboss for example. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3983676#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...