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rmi-demo

RMI means Java Remote Method Invocation. This project is a demo to show how RMI works.

RMI Architecture

RMI contains three parts :

  • client
  • server
  • registry

A RMI server provides some services which can be registered into a RMI registry. Then, a RMI client finds the service it want by asking registry , and use the service if it exists.

RMI Architecture

Registry & Server

We can create a RMI registry by calling method createRegistry, or using rmiregistry command. However, you will get ClassNotFound error if you use rmiregistry command directly, because a rmi registry must load the classes which is declared remoting. java.rmi.server.codebase property can be used to solve the problem. (Unfortunately, I never do it successfully.🙃)

Actually, some applications create registry on the server machine. That is, registry and server are usually running in a same JVM.

Client

Client program must use remoting interface by adding a dependency of the jar file. IP and port are used to recognized the service's address. So, client invokes the remoting service by indicating IP and port.

References

Java RMI

java.rmi.codebase