Yes. I have deleted the xmlparserv2.jar which i really do not need. And i have removed the hibernate capabilities from my project which are adding xml... jars to my WAR file which are causing problem in jboss 5.1.0 GA. Jboss 5.1 contains xml jars already. So do not need them in your WAR. Sridhar. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4258509#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...