User development, A new message was posted in the thread "java.lang.ClassCastException: org.hibernate.ejb.HibernatePersistence": http://community.jboss.org/message/520271#520271 Author : jaikiran pai Profile : http://community.jboss.org/people/jaikiran Message: -------------------------------------------------------------- That single line of log is not going to help in identifying the issue. Please post the entire exception stacktrace and some details around when this happens and some information about your application.   By the way, the latest stable 5.x series AS is 5.1.0. You might want to upgrade to that. -------------------------------------------------------------- To reply to this message visit the message page: http://community.jboss.org/message/520271#520271