It may help anyone who face the same ces error stack, I solved this by analyzing the dependencies of the project and discovering that several Xerces jar where included in the web app (lib folder). These Xerces jar where conflicting with JBoss own shared libraries. After removing these libraries, the web app runs fine. Best regards, Eric View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4238619#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...