HI Jaikiran, As you said, JBoss 5 is a client of Jboss 4.0.5. I am not packaging any Jboss specific jar file along with my application. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4203902#4203902 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4203902