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6.6. Clustered Enterprise JavaBeans

6.6.1. About Clustered Enterprise JavaBeans (EJBs)

EJB components can be clustered for high-availability scenarios. They use different protocols than HTTP components, so they are clustered in different ways. EJB 2 and 3 stateful and stateless beans can be clustered.
For information on singletons, refer here: Section 7.4, “Implement an HA Singleton”.


EJB 2 entity beans cannot be clustered. This limitation is not expected to be changed.