I've been searching for solutions for nearly two days straight now, tried everything, but it just don't seem to work. I found a very nice overview of the possibilities, here: http://svn.nuxeo.org/nuxeo/ECMPlatform/NXCore/trunk/doc/Transactions.txt I tried the different steps, but none work/worked for me. Please help me out, info follows: #############My Seam action bean##############"" @Stateful @Scope(CONVERSATION) @Name("register") public class RegisterAction implements IRegister { @In(create=true) @Out private Person currentUser; @In(create=true) @Out private LoginEntity loginEntity; @In private EntityManager em; //-----CONSTRUCTORS----- public RegisterAction() { } @Rollback(ifOutcome= {"failure"}) @End public String register() { try { this.em.persist(this.currentUser); this.em.persist(this.loginEntity); //this one throws an Exception } catch (Exception e) { return "failure"; } return "success"; } @Remove @Destroy public void destroy() { } } As you can see, I try to persist two objects, the first one succeeds (and is persisted in the DB), the second one doesn't and throws an exception, causing the method to return "failure" and should rollback, but it doesn't: the first objects gets persisted in the DB, but it should't. Please help me out. If you need more info (web.xml, persistence.xml, ...) just ask. Bram On Thursday 28 December 2006 14:06, Bram Biesbrouck wrote: