IBM User Guide for Java V7 on Windows > IBM SDK for Java > The ORB

RMI and RMI-IIOP

This description compares the two types of remote communication in Java™; Remote Method Invocation (RMI) and RMI-IIOP.

RMI is Java's traditional form of remote communication. It is an object-oriented version of Remote Procedure Call (RPC). It uses the nonstandardized Java Remote Method Protocol (JRMP) to communicate between Java objects. This provides an easy way to distribute objects, but does not allow for interoperability between programming languages.

RMI-IIOP is an extension of traditional Java RMI that uses the IIOP protocol. This protocol allows RMI objects to communicate with CORBA objects. Java programs can therefore interoperate transparently with objects that are written in other programming languages, provided that those objects are CORBA-compliant. Objects can still be exported to traditional RMI (JRMP) and the two protocols can communicate.

A terminology difference exists between the two protocols. In RMI (JRMP), the server objects are called skeletons; in RMI-IIOP, they are called ties. Client objects are called stubs in both protocols.

Parent: The ORB

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