It seems this Exception is haunting me. I am able to deploy my process definition and there is no exception thrown when viewing the list of process definitions but as soon as I want to start an instance of the process. I tried to follow bwestrich's advice and searched for the actual cause but I could not find any. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4263470#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...