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## Trail: RMI

### by Ann Wollrath and Jim Waldo

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The Java Remote Method Invocation (RMI) system allows an object running in one Java Virtual Machine (VM) to invoke methods on an object running in another Java VM. RMI provides for remote communication between programs written in the Java programming language.

> Note: If you are connecting to an existing IDL program, you should use Java IDL rather than RMI. For more information, see IDL.

This trail provides a brief overview of the RMI system and then walks through a complete client/server example that uses RMI's unique capabilities to load and to execute user-defined tasks at runtime. The server in the example implements a generic compute engine, which the client uses to compute the value of .

An Overview of RMI Applications describes the RMI system and lists its advantages. Additionally, this lesson provides a description of a typical RMI application, composed of a server and a client, and introduces important terms.

Writing an RMI Server walks through the code for the compute engine server. This example will teach you how to design and to implement an RMI server.

Creating A Client Program takes a look at one possible compute engine client and uses it to illustrate the important features of an RMI client.

Compiling and Running the Example shows you how to compile and to run both the compute engine server and its client.

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