IBM User Guide for Java V7 on Windows > Developing Java applications > RMI over IIOP > RMI-IIOP Programmer's Guide

What are RMI, IIOP, and RMI-IIOP?

The basic concepts behind RMI-IIOP and other similar technologies.

RMI

With RMI, you can write distributed programs in the Java™ programming language. RMI is easy to use, you do not need to learn a separate interface definition language (IDL), and you get Java's inherent "write once, run anywhere" benefit. Clients, remote interfaces, and servers are written entirely in Java. RMI uses the Java Remote Method Protocol (JRMP) for remote Java object communication. For a quick introduction to writing RMI programs, see the RMI tutorial Web page: http://download.oracle.com/javase/tutorial/rmi/, which describes writing a simple "Hello World" RMI program.

RMI lacks interoperability with other languages, and, because it uses a non-standard communication protocol, cannot communicate with CORBA objects.

IIOP, CORBA, and Java IDL

IIOP is CORBA's communication protocol. It defines the way bits are sent over a wire between CORBA clients and servers. CORBA is a standard distributed object architecture developed by the Object Management Group (OMG). Interfaces to remote objects are described in a platform-neutral interface definition language (IDL). Mappings from IDL to specific programming languages are implemented, binding the language to CORBA/IIOP.

The Java Standard Edition CORBA/IIOP implementation is known as Java IDL. Along with the IDL to Java (idlj) compiler, Java IDL can be used to define, implement, and access CORBA objects from the Java programming language.

The Java IDL Web page: http://download.oracle.com/javase/1.5.0/docs/guide/idl/index.html, gives you a good, Java-centric view of CORBA/IIOP programming. To get a quick introduction to writing Java IDL programs, see the Getting Started: Hello World Web page: http://download.oracle.com/javase/1.5.0/docs/guide/idl/GShome.html.

RMI-IIOP

Previously, Java programmers had to choose between RMI and CORBA/IIOP (Java IDL) for distributed programming solutions. Now, by adhering to a few restrictions (see Restrictions when running RMI programs over IIOP), RMI server objects can use the IIOP protocol, and communicate with CORBA client objects written in any language. This solution is known as RMI-IIOP. RMI-IIOP combines RMI ease of use with CORBA cross-language interoperability.

Parent: RMI-IIOP Programmer's Guide

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