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All remote servers are a subclass of the class UnicastRemoteObject in the rmi.server package. Extending this class means that it will be a (nonreplicated) remote object that is set up to use the default socket-based transport layer for communication.
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This is the inheritance diagram of the server classes:
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Beginning of example HelloImpl class: import java.rmi.*; import java.rmi.server.*; public class HelloImpl extends UnicastRemoteObject implements Hello
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Object
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Remote Object
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RemoteStub
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RemoteServer
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UnicastRemoteObject
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Remote interface
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