Hi, Now I struggle with the transaction and persistence context propagation :( I found that the joinTransaction() methods were called in the following codes: (1)EntityHome.joinTransaction() are called in persist(), update() and remove() of the EntityHome(with @Transactional). (2)seam-managed-EntityManager.joinTransaction() are called in the Dao components(with @Transactional) of the examples/wiki. *** Q1 *** What does each(EntityHome and seam-managed EntityManager) joinTransaction() do? When should I call each method? I suppose it is related to the persistence context propagation. *** Q2 *** What is the difference between @Transactional and joinTransaction()? *** request *** I was not able to find the detailed information about the joinTransaction() methods in the official documents. I hope that this will be described in the reference guide and/or javadoc (if important for the seam app developers). my environments: -JBoss AS 4.2.0.GA -JBoss Seam 2.0.0.BETA1(CVS) Thanks in advance. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4065192#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...