"ziolmar" wrote : Hi, | | I have a problem with different version of Hibernate which I put to lib directory in .ear file. I have JBoss 4.2.2 and I need to use Hibernate 3.2.6.GA. First it was ClassCastException which appears when jboss was deploing .jar with EJB classes | Please post the entire exception stacktrace. Have you enabled classloader scoping for your EAR file? "ziolmar" wrote : | but i figure out that apart from Hibernate libraries and it dependancies I must include also jboss-j2ee.jar and jbosssx.jar. These need not be included in your application. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4153932#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...