Means it cannot find the class org/hibernate/Session . Looks like you haven't got the required hibernate jar files in your classpath. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4102092#4102092 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4102092