[Beginners Corner] - EJB 3 merge vs persist
by hebahob
Hi,
I have a remote client using jndi (InitialContext) to grab remote interfaces of EJBs (I am using EJB3.0, so I am not talking about the home/remote difference, but I am grabbing the interface I have annotated as @Remote). If this client picks up an EntityManager with a standard persistence context, how should I put changes back to the server after changing the entity?
Currently I use:
| mgr.merge( changedObject );
| mgr.persist( changedObject );
|
I understand that persist works only if the entity is still in managed state according to the container. The two areas of confusion for me are:
1. Does merge do the persist too? Or does it simply bring the entity back into persistent state, and then I need to persist() as above?
2. Are all entity beans that are used from session bean stubs on remote clients pulled out of context? i.e. Do I have to always call merge if I use an entity bean [from a session bean] from a remote client?
Thanks in advance
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20 years
