No, the optimistic support was added after EJB3 RC9 Patch 1. :( View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4039371#4039371 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4039371