User development, A new message was posted in the thread "Issue specifying the <jar-file> in persistence.xml in JBOSS 5 on linux system": http://community.jboss.org/message/519993#519993 Author : jaikiran pai Profile : http://community.jboss.org/people/jaikiran Message: -------------------------------------------------------------- With the sample application you provided, i am able to reproduce this issue even on my linux machine. I'll look into this to see what is causing the problem. -------------------------------------------------------------- To reply to this message visit the message page: http://community.jboss.org/message/519993#519993