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Do my earlier EJB (2.1, 2.0, 1.1) applications continue to work?

April 26, 2017applications Continue EJB

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Do my earlier EJB (2.1, 2.0, 1.1) applications continue to work?

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Absolutely. Any application written to one of these earlier versions of the EJB specification will continue to work unchanged under EJB 3.0. It is not necessary to modify your application, to recompile your application, or even to modify its deployment descriptor.