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/519294#519294 Author : Peter Johnson Profile : http://community.jboss.org/people/peterj Message: -------------------------------------------------------------- I think that the issue has to do with the application.xml file. Look at this part of the error message:   Note the '\' instead of a '/'. -------------------------------------------------------------- To reply to this message visit the message page: http://community.jboss.org/message/519294#519294