Use statefull beans, stateless beans only live for one request-response cycle( 
they are not very usefull in this way), and use @PersistenceContext(type = 
PersistenceContextType.EXTENDED) on manager if you want to keep persistence 
context for more than one cycle,
this way persistence context is bound to life cycle of statefull bean not just 
transaction.
That way your entities will not be detached after response.
Something else there is a third way, you can bound persistence context to an 
conversation, that can only be managed with seam, that way all statefull or 
stateless beans that live in side conversation share the same persistence 
context, but you have to inject manager

  |  @In
  |     private EntityManager em;
  | 

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