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Editorial Team
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Asked: 2026-05-25T01:40:14+00:00

I know Stateless EJBs are stored in a pool and instantiated as needed, my

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I know Stateless EJBs are stored in a pool and instantiated as needed, my question is, what happens when there are more EJB dependencies, for example with something like this:

@Remote
@Stateless
public class Master_EJB{
     @EJB
     private EJB_A ejb_A;

     @EJB
     private EJB_B ejb_B;
}

With EJB_A and EJB_B also being stateless EJBs.

In the worst case, if there are two petitions at exactly the same time, the server will retrieve two instances of Master_EJB from the pool (or create if needed).

But if from those two calls, one only needs the EJB_A and the other only the EJB_B, how many instances are needed: 4 (2 Master_EJB + 1 EJB_A + 1 EJB_B) or 6 (2 Master_EJB + 2 EJB_A + 2 EJB_B)?

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1 Answer

  1. Editorial Team

    EJB_A and EJB_B are stateless or stateful?

    If stateless, answer depends on container/pool type used and recent situation (number of requests, server load and so on).
    If stateful and container will instantiate 2 Master_EJB instances, then two instances of EJB_A will be instantiated and also two instances of EJB_B will be instantiated.

    Please bear in mind that container may create two Master_EJB instances – it depends on container itself and the current situation again (as well, container may decide to process request using only one Master_EJB instance).

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