"pete.muir(a)jboss.org" wrote : I'm not sure its a good idea, not least because you are going to need to write a custom exception handling layer that correctly deals with transaction management. Yes you are right. Another problem (which might be serious to some kind of applications) is that it might degrade performance since it checks the validity against the data from the database as well. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4073736#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...