Java RMI Interview Questions and Answers - 1
Question: 1
What is RMI?
Remote Method Invocation allows java object that executes on one machine and to invoke the method of a java object to execute on another machine.
The steps involved in developing an RMI object are
Defining the interfaces
Implementing these interfaces
Compile the interfaces and their implementations with the java compiler
Compile the server implementation with RMI compiler
Run the RMI registry
Run the application
Question: 2
What is RMI architecture?
RMI architecture consists of four layers and each layer performs specific functions.
Application layer – contains the actual object definition
Proxy layer – consists of stub and skeleton
Remote Reference Layer – gets the stream of bytes from the transport layer and sends it to the proxy layer.
Transportation layer machine communication – responsible for handling the actual machine to machine communication.
Question: 3
What is unicast remote object?
All remote objects must extend unicast remote object, which provides functionality that is needed to make objects available from remote machines.
Question: 4
Explain the methods, rebind() and lookup() in Naming class?
rebind() of the Naming class (found in java.rmi) is used to update the RMI registry on the server machine.
Naming.rebind (“AddServer”, AddServerImpl);
lookup() of the Naming class accepts one arguments, the rmi URL and returns a reference to an object of type AddServerImpl.
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