It's finally working :) I deployed jbpm in jboss-4.2.1-GA and it's working there with iframe. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4144047#4144047 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4144047