I did not see it working literally, but did hear someone did the same with IBatis. And yes, if there are library conflicts, between hibernate and toplink, that can be a problem (nothing to do with jBPM then). But jBPM can be accessed 'remotely', so you could deploy it in it's own war or something and maybe prevent classloader problems. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4243020#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...