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7.11.8 Non-reentrant instances

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spec 7.11.8 says :-
"Note that a session object is intended to support only a single client. Therefore, it would be an application error if two clients attempted to invoke the same session object."
Fine... I understand. But my ques is :-

Will this scenario EVER happens in the container???

As far as I understand, the container will be creating another instance of the bean, unless it's an entity bean.
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In a case with the stateless session beans one bean instance can service multiple clients as long as the clients are not concurrent.

I am not exactly sure how to replicate the concurrent access on the same stateless session bean in order to test that the container does throw an error.
I'd say that the client program gets hold of EJBObject(through home create method). Then client runs two threads with each calling methods on this EJBObject. If these two threads invoke a method on the bean (through the same EJBObject) at the same time it will mean we are accessing one bean concurrently. I guess I'll have to try it now

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