Of course, I see no reason why that won't work (we have had to move to newer versions of some hibernate stuff like annotations and entitymanager to get compatibility with hibernate search, so its not a solid rule). But, really, it matters what version of hibernate you *deploy* not compile against as the hibernate api is pretty stable. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4100299#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...