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Stateful Session Beans are the least use type of EJBs. I saw a few usages of Stateful Session Beans but most of them were improper. Stateful Session Beans are the least understood type of EJBs. What are they for? Or better: show me use cases where Stateful Session Beans are essential solution! The internet gives several answers but not always proper. We will investigate those answers.

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Local EJB can be accessed by clients from the same application. But not only. The EJB specification admits that a local EJB can be accessed by any client from the same JVM. It is up to EJB Container provider if it allows such invocations. Fragment of EJB 3.1 specification:

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