"heiko.braun(a)jboss.com" wrote : I think the biggest problem with the CMP based implementation is the container dependence. It always requires a vendor specific persistence mapping. But if we move to JPA we get rid of that problem. that makes sense to me. (and makes me change my mind) so what you're saying is that with ejb3, there is a bigger chance that the .ear file will run without modifications on lets say websphere or weblogic ? if that is true, then i'm in favour of moving to ejb 3. with ejb 2, we will not have the time to build those appserver specific deployment descriptors. so ejb 3 would give us better coverage of environments. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4208960#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...