You need jbpm-jpdl.jar as included in the Seam distribution. No other jbpm jars. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4088334#4088334 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4088334