User development, A new message was posted in the thread "Issue specifying the &lt;jar-file&gt; in persistence.xml in JBOSS 5 on linux system": http://community.jboss.org/message/519468#519468 Author : jaikiran pai Profile : http://community.jboss.org/people/jaikiran Message: -------------------------------------------------------------- Where exactly is myejbmodule.jar located? From your first post, i don't see it being present. Is it the same as the one in .ear/lib/extejbmodule.jar? In general if the jar is present at the root of the ear, then the jar-file element should be:   <jar-file>myejbmodule.jar</jar-file> -------------------------------------------------------------- To reply to this message visit the message page: http://community.jboss.org/message/519468#519468