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When a remote object class is created that extends UnicastRemoteObject, the object is exported, meaning it can receive calls from external Java virtual machines and can be passed in an RMI call as either a parameter or return value. An object can either be exported on an anonymous port or on a specified port. For objects not extended from UnicastRemoteObject, the
java.rmi.server.UnicastRemoteObject.exportObjectmethod is used to explicitly export the object.
Stub can't be instantiated.
Stub not of correct class.
note: this exception is deprecated in JDK1.2
Skeleton can't be instantiated.
Skeleton not of correct class.
The port is in use by another VM.