Java products overview

This section provides an overview of the most recent versions of the major Java products. For information on Java requirements for JRun, see "Java requirements". For more information on current versions of Java, see the Sun web site at http://java.sun.com.

Java platform editions

The Java Platform defines the architecture of the Java environment. There are three editions of the Java 2 platform:

Standard Edition (J2SE)
Enterprise Edition (J2EE)
Micro Edition (J2ME)

The following section describes the Java 2 platforms are implemented by the Java 2 Software Development Kit.

Java 2 Software Development Kit

The Java 2 SDK, also called the Java Development Kit (JDK), consists of the JRE plus the following tools and core classes for developers to compile, debug, and run applications on the Java platform:

Resource

Major components

Java 2 SDK

Compiler and debugger

Java Runtime Environment

Win32 Performance Pack (optional)

Solaris Native Threads Pack (optional)

JRE

Java Virtual Machine

Java application launcher

Runtime class libraries

Java plug-in (for browsers)

Java HotSpot Runtime
(1.3 and later)

Resource	Major components
Java 2 SDK	Compiler and debugger Java Runtime Environment Win32 Performance Pack (optional) Solaris Native Threads Pack (optional)
JRE	Java Virtual Machine Java application launcher Runtime class libraries Java plug-in (for browsers) Java HotSpot Runtime (1.3 and later)

The following figure shows the Sun Java 2 SDK and JRE:

This figure shows the Sun Java 2 SDK and JRE.

To install JRun, you minimally need a JRE version 1.3.0 or later on your computer. However, to take full advantage of all JRun capabilities, install the Java 2 SDK version 1.3.0 or later.

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Installing JRun
Before You Begin