Hi, I've tried to implement that in ejb3. I had some problem with some specific cases such as array. Moreover, with this approach I was quite anxious with the impact on the performance of my application. I stopped to look at that ... but I'm still interesting with that subject. Other approach may be to use DB trigger but that's DB specific and problem is to get the user that perform the change. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3993198#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...