CORBA Implementation in Java | CORBA IDL | CORBA Java Part 1

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CORBA Technology and the Java™ Platform Standard Edition

The Java Platform Standard Edition, v1.4, provides an Object Request Broker (ORB) and two CORBA programming models that can utilize the Java CORBA ORB and Internet InterORB Protocol (IIOP). This topic discusses these options for creating and distributing CORBA technology.

CORBA technology is an integral part of the Java platform. It consists of an Object Request Broker (ORB), APIs for the RMI programming model, and APIs for the IDL programming model.

For more information on which specifications are implemented in this release of the Java platform, see the compliance document.
How does Java SE leverage CORBA

Common Object Request Broker Architecture (CORBA) technology is the open standard for heterogeneous computing. CORBA complements the Java™ platform by providing a distributed object framework, services to support that framework, and interoperability with other languages. The Java platform complements CORBA by providing a portable, highly productive implementation environment, and a very robust platform. By combining the Java platform with CORBA and other key enterprise technologies, the Java Platform is the ultimate platform for distributed technology solutions.

CORBA standards provide the proven, interoperable infrastructure to the Java platform. IIOP (Internet Inter-ORB Protocol) manages the communication between the object components that power the system. The Java platform provides a portable object infrastructure that works on every major operating system. CORBA provides the network transparency, Java provides the implementation transparency.
The Object Request Broker

An Object Request Broker (ORB) is part of the Java Platform Standard Edition, since version 1.3. The ORB is a runtime component that can be used for distributed computing using IIOP communication.

NOTE: Although it is true that ORBs written in different languages should be able to talk to each other, we haven't tested the interoperability of the Java ORB with other vendor's ORBs.

The Object Management Group (OMG) is an industry consortium that creates and publishes specifications for CORBA. Vendors implement the specifications to produce products known as Object Request Brokers (ORB). The good news for developers is that the Java™ Platform Standard Edition, v1.2 and higher includes an ORB that is available in every deployment of the Java Platform Standard Edition. For more information, see the ORB class.

The Java CORBA ORB supports both the RMI and IDL programming models, both of which can use the underlying IIOP wire-level protocol for communication.
Introducing the CORBA Programming Models
History of the CORBA Programming Models

In 1997, Remote Method Invocation, or RMI, was introduced in JDK 1.1. Initially, RMI was positioned as a natural outgrowth of Remote Procedure Calls (RPC), strictly for enabling calls to be made between Java objects in different virtual machines, and even on different physical machines.

In 1998, came JDK 1.2, which introduced Java IDL, a Java API for interoperability and integration with CORBA. Java IDL included both a Java-based ORB, which supported IIOP, and the IDL-to-Java compiler, idltojava, for generating client-side stubs and server-side code skeletons. The ORB supports both the RMI over IIOP and Java IDL programming models.

In 1999, the RMI over IIOP standard extension to the Java platform was introduced for JDK 1.1.6 and 1.2. Now that RMI over IIOP is integrated into J2SE version 1.3 and higher, the optional download has been end-of-lifed, but is still available from the archives.

The OMG finalized modifications of its IIOP specification so that it would support most of the JDK 1.1 functionality of RMI. RMI over IIOP was introduced as a standard extension to JDK 1.2. This enabled remote objects written in the Java programming language to be accessible from any language via IIOP.

J2SE, v.1.3 introduced a new, 100% Pure Java™, IDL-to-Java compiler, idlj, along with support for IDL abstract interfaces and value types. Also in v.1.3, RMI over IIOP is included in the JDK.

J2SE v.1.4, the current version, was introduced in 2001, and includes support for the Portable Object Adapter, Portable Interceptors, Interoperable Naming Service, GIOP 1.2, and Dynamic Anys. J2SE v.1.4 also includes an Object Request Broker Daemon (ORBD), which is used to enable clients to transparently locate and invoke persistent objects on servers in the CORBA environment, and servertool, which provides a command-line interface for application programmers to register, unregister, startup, and shutdown a persistent server. For more information on new features in J2SE v.1.4, see Changes in CORBA Features Between J2SE 1.3 and 1.4.
Comparing the CORBA Programming Models
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