[jboss-user] [JBoss Seam] - Booking example question

[lawrieg]

Hi,

I've just been re-reading the Seam tutorial and I just wanted to check if my understanding is correct regarding the Booking example code...

In the HotelBookingAction class the selectHotel method reads as follows:

@Begin
  | public String selectHotel(Hotel selectedHotel) {
  |     hotel = em.merge(selectedHotel);
  |     return "hotel";
  | }

Am I correct that the reason the line hotel = em.merge(selectedHotel) is necessary is because the selectedHotel object was obtained by a different entity manager?

And, if so, does this mean that you always need to use em.merge when an object that was loaded in one class is passed as a parameter to a method in another class? 

Thanks,

Lawrie

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