"kasim" wrote : "msystems" wrote : Use @PersistenceContext if you are using EJB3 and if you need a new transaction (@TransactionAttribute(TransactionAttributeType.REQUIRES_NEW) ) - Seam ref: | | | | anonymous wrote : | | | If you are using EJB3 and mark your class or method @TransactionAttribute(REQUIRES_NEW) then the trans- | | | action and persistence context shouldn't be propagated to method calls on this object. However as the Seam- | | | managed persistence context is propagated to any component within the conversation, it will be propagated to | | | methods marked REQUIRES_NEW. Therefore, if you mark a method REQUIRES_NEW then you should access the en- | | | tity manager using @PersistenceContext. | | | | | | | otherwise use SMPC. | | | | What you are saying at the top part is true. | | However i don't believe the doco is saying use SMPC all the time. | | Take a look at the first paragraph of the section. It basically refers to if you are using the component outside of a Java EE5 environment or if you have many loosly coupled components. Which as long as they are all SB the PersisetnceCOntext should transfer. However the doco is 100% right if you are going to have a mix of SB and POJOS .... then yeah doing the EntityManager injection is the only way to go. | | So you can stick with the @PersistenceContext in most situations. Its going to be a situation where you are wanting to transact against non-EJB components you will want to use the @IN EntityManger. | | Of course that being said i am not sure the harm it would cause using the @In EntityManager more often. Of course you don't have to use SMPC if you don't want to use it ! But there is an advantage in using SMPC if you have a lot of conversations with loosly coupled components. 98% of the time I'm using a SMPC and the last 2% of the time I'm using a persistence context (@PersistenceContext) - of course together with Seam-managed transactions. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4127541#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...