proper usage of persistencecontexts/entitymanagers

[balamg]

i have the following code

@Stateful
class Navigator {
@PersistenceContext (type=EXTENDED)
EntityManager em;

List userList = new ArrayList();

public void init() {
userList = em.createQuery("select u from User u").getResultList();
}

public void addUser(User u) {
userList.add(u);
}
}

Then I have another SLSB to add new Users like so:

@Stateless
class ActionBean {
@PersistenceContext
EntityManager em;

@In Navigator n;

public void addUser (User u) {
em.persist(u);
n.addUser(u);
}
}

Basically, user saved using one EntityManager (in the slsb) is added to a list that is attached to an extended persistence context.
Is the underlying peresistence context the same ?
This seems to be working fine but wanted to endorse it from the experts.

[gavin.king]

No, the PC will only be the same if you call the SLSB from the SFSB.

[balamg]

I did observe some queer behavior as I progressed and your reply definately saved me some time.

It would be of great help to get clarifications for the following as well.

Whether the underlying PCs are the same in the following scenarios :

One SFSB with extended PC invoking another SFSB with extended PC ?
with non-extended PC ?

One SLSB invoking another SLSB.

Thank You