Hi!

I am currently working with the examples and am currently read the tutorial that describes the messages example. Even when the tutorial is quite good there are unfortunately a few parts I don't understand:

(1)

MessageManagerBean.java:

@DataModelSelection
@Out(required=false)
private Message message;

  
Why is that code block annotated with "Out"? Shouldn't there be an "In" so that the selection is injected?

(2)
MessageManagerBean.java:

@PersistenceContext(type=EXTENDED)
private EntityManager em;

What does that "type=EXTENDED" do?

(3)
Why does the message bean have the scope "EVENT" while the messageManager bean has the scope "SESSION"? Doesn't it have the same scope as the bean it is referenced in?

The messageManager bean has the property private Message message, and because that message property belongs to the session scoped messageManager it has the "SESSION" scope as well, doesn't it?

Could you help me to understand these questions?

Thank you in advance!