SMPC:@In EntityManager or @PersistenceContext ?

[dkane]

Dear colleagues,

I've read a lot about advantages of SMPC in this forum.
In documentation, the recommended way to configure and use SMPC is :

components.xml :

<core:managed-persistence-context name="bookingDatabase"
 auto-create="true"
persistence-unit-jndi-name="java:/EntityManagerFactories/bookingData"/>

Java code :

@In EntityManager bookingDatabase;

The best way of learning is examples , and I am looking into Seam 2.0 examples directory then.
Almost all examples contains the corresponding configuration tag in components.xml.
However, entityManager is being injected with @PersistenceContext or
@PersistenceContext(TYPE=EXTENDED) in the vast majority of Java code. The canonical examples Booking and DVDStore does that too.

Is SMPC actually used in Seam examples ? If not (BTW, why ?), where can I see sources of complete SMPC application ?

Thank you.

[pmuir]

The docs discuss why an SMPC is an advantage. Some examples use one, some don't. Examples of ones that do: seamdiscs, seambay, seamspace.

You can see a pattern - newer examples use it more extensively ;)