[jboss-user] [EJB 3.0] - Performance question on EntityManager

[akrishmohan]

Hi All

I have a scenario and am trying to evaluate the performance of using the entity manager in a Message Driven Bean (MDB) 

class MDBean {
@persistencecontext(....)
private EntityManager em;

public void onMessage() {
....
while (someCondition) {
  ClassB b = new ClassB();
  b.setEntityManager(em);
  b.doSomething();
}
............
}

Basically ClassB carries out persisting of about 6 tables based on the entitymanager passed to it. This process happens in a loop and the loop runs for about 10 - 20 times. I was wondering if I need to close the entity maanger at some point and re-create it? What would be the performance hit if any? Let me know what other design considerations need to be taken into account? 

Thanks
K

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