I posted this on another forum ( http://www.jboss.com/index.html?module=bb&op=viewtopic&t=87057 ) but got no response, perhaps it belongs here. If you follow the link you'll see that writing <jar-file>../../applicationone/referenced_project.par</jar-file> in the persistence.xml leads to some strange behaviour. The '../' doesn't seem to do there job and go to the parent directory. Instead they eat one character of the specified path. Anyone that can explain this? Cheers, Pieter-Jan View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3963709#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...