I had met the same question with you ,but as i know , the jbpm2.0 also need jdk1.4. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3974412#3974412 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3974412