Thanks for the hint, jacob.orshalick. Actually, the problem is however not about re-associating a single know entity to the new session but rather about re-associating all entities in the current long running transaction. So the challenge is much rather how to find / enumerate all entity objects that exist in the current transaction. btw: I already knew session.merge() and a few other hibernate tricks that re-associate a single entity, but a "grep" through the Seam source (Seam2.0.0.BETA1) had shown me that Seam does not actually use merge() to achieve the goal even before I started this thread. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4084918#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...