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EJB is a component architecture for distributed server side objects.
Distributed objects are the foundation for multi-tier architecture. The presentation logic resides on the client, business logic on the next layer and other resources such as database on the last tier. Distributed objects protocol allows an object on one computer to access objects on another. Java RMI and IIOP are some of the protocols. These protocols provides network communication between the objects. In addition they provides methods to locate objects using naming facility, resource management, distributed garbage collection. Like JavaBeans EJB is a component model, but EJB is for server side distributed component model.
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