jbpm uses a backported version of jsf 1.2 If 4.2 uses 4.2, I think you should remove the jsf stuff from jbpm. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4027092#4027092 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4027092