Is stateless state cleared after its job?

Question

I have a stateless EJB:

@Stateless
public class DefaultStatelessService implements StatelessService {

    private Object o;

}

where I use provate field o in few private methods. The question is: after the stateless will finish it's job will its state be cleared?

For example:

Stateless instance has been taken from pool.
State of private field o has been changed during stateless job.
Stateless instance has been returned to pool.
Some other operation taken the same stateless instance and want to use it - is object o in the same state as before or it has been cleared?

I did it in this way because few private methods use this object so I though it will be easier to use it as private field than each method parameter. — pepuch, Aug 12 '14 at 08:04
I don't think the field will be cleared, however you musn't store a data related to a specific user in a stateless EJB. This other question might give you some information http://stackoverflow.com/questions/2351220/stateless-and-stateful-enterprise-java-beans. — Dici, Aug 12 '14 at 08:10

score 1 · Answer 1 · answered Aug 12 '14 at 08:18

You cannot rely upon any state stored in a stateless session bean between method invocations.

Some container implementations may not even bother to use a pool - it will just give you a new instance each time.

In your example there is nothing that will explicitly clear "o", but it's quite possible the entire bean instance will be discarded.

1 Answers1