Try packaging the 5.0.1 client JARs into your WAR file, and adding a scoping repository to your jboss-web.xml file. Something like this (replace xxx and yyy with anything you want: <jboss-web> | <class-loading java2ClassLoadingCompliance="false"> | <loader-repository>xxx:loader=yyy</loader-repository> | </class-loading> | </jboss-web> You can search for "class scoping" in the wiki for more info. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4230953#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...