Hi, I am using JBoss 4.0.5 which I installed using the ejb3 profile of jems-installer-1.2.0.GA.jar. I have then replaced the bundled hibernate 3.2.0.GA jar files jboss-4.0.5.GA\server\default\lib\hibernate3.jar jboss-4.0.5.GA\server\default\lib\hibernate-annotations.jar jboss-4.0.5.GA\server\default\lib\hibernate-entitymanager.jar with the latest versions downloaded from http://www.hibernate.org/6.html Hibernate 3.2.2.GA Hibernate Annotation 3.2.1.GA Hibernate Entity Manager 3.2.1.GA Is it ok updating the jars like this in JBoss? Is there anything else I need to do? Many Thanks, James View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4012990#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...