anonymous wrote : java.lang.NoClassDefFoundError: net/sf/hibernate/HibernateException Which version of Hibernate does your application use? Are you packaging any Hibernate jars in your application? And which version of JBoss are you deploying this on? The exception indicates that you are using Hibernate 2.x which is an old version. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4191456#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...