Enterprise java beans(EJB)

EJB is a specification, which provides server side applications that communicate with remote clients to provide a given processing function. By definition, EJBs are part of a client/server system. They normally do no function by themselves without any intraction from a client. The client could be a java bean or other non-java objects on the network.

Types of EJBs

EJBs are two types:

·         Session Bean
         Stateful Session Bean
         Stateless Session Bean

Entity Bean
      Container Managed Persistence
Bean Managed Persistence

Difference between Entity bean and session bean

An Entity Bean is client independent and has a long life. It needs to maintain an identity for each specific instance. But a session bean is client dependent and exists to serve a single client request and, basically, just disappears after that.

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