* Disclaimer - this text represents the contents of the README.html file included in Java 2 SDK, Standard Edition, 1.4.2_19.  As these contents are dated, some links may no longer be valid.


JavaTM 2 SDK, Standard Edition
Version 1.4.2


  • Introduction
  • System Requirements & Installation
  • Java 2 SDK Documentation
  • Release Notes
  • Compatibility
  • Bug Reports and Feedback
  • Contents of the Java 2 SDK
  • Java 2 Runtime Environment
  • Redistribution
  • Web Pages


Thank you for downloading this release of the JavaTM 2 SDK, Standard Edition. The Java 2 SDK is a development environment for building applications, applets, and components using the Java programming language.

The Java 2 SDK includes tools useful for developing and testing programs written in the Java programming language and running on the Java platform. These tools are designed to be used from the command line. Except for the appletviewer, these tools do not provide a graphical user interface.

System Requirements & Installation

System requirements, installation instructions and troubleshooting tips are located on the Java Software web site at:
Development Tools
(In the bin subdirectory.) Tools and utilities that will help you develop, execute, debug, and document programs written in the Java programming language.
Runtime Environment
(In the jre subdirectory.) An implementation of the Java 2 runtime environment for use by the SDK. The runtime environment includes a Java virtual machine, class libraries, and other files that support the execution of programs written in the Java programming language.
Additional Libraries
(In the lib subdirectory.) Additional class libraries and support files required by the development tools.
Demo Applets and Applications
(In the demo subdirectory.) Examples, with source code, of programming for the Java platform. These include examples that use Swing and other Java Foundation Classes, and the Java Platform Debugger Architecture.
C header Files
(In the include subdirectory.) Header files that support native-code programming using the  Java Native Interface, the  Java Virtual Machine Debugger Interface, the  Java Virtual Machine Profiler Interface  and other functionality of the Java 2 Platform.
Source Code
(In src.zip.) Java programming language source files for all classes that make up the Java 2 core API (that is, sources files for the java.*, javax.* and some org.* packages, but not for com.sun.* packages). This source code is provided for informational purposes only, to help developers learn and use the Java programming language. These files do not include platform-specific implementation code and cannot be used to rebuild the class libraries. To extract these file, use any common zip utility. Or, you may use the Jar utility in the Java 2 SDK's bin directory:
    jar xvf src.zip

The Java 2 Runtime Environment

The Java 2 Runtime Environment is available as a separately downloadable product.

The Java 2 Runtime Environment allows you to run applications written in the Java programming language. Like the Java 2 SDK, it contains the Java virtual machine, classes comprising the Java 2 Platform API, and supporting files. Unlike the Java 2 SDK, it does not contain development tools such as compilers and debuggers.

You can freely redistribute the Java 2 Runtime Environment with your application, according to the terms of the Runtime Environment's license. Once you have developed your application using the Java 2 SDK, you can ship it with the Runtime Environment so your end-users will have a Java platform on which to run your software.


Subject to the terms and conditions of the Software License Agreement and the obligations, restrictions, and exceptions set forth below, You may reproduce and distribute the Software (and also portions of Software identified below as Redistributable), provided that:
  1. you distribute the Software complete and unmodified and only bundled as part of Your applets and applications ("Programs"),
  2. your Programs add significant and primary functionality to the Software,
  3. your Programs are only intended to run on Java-enabled general purpose desktop computers and servers,
  4. you distribute Software for the sole purpose of running your Programs,
  5. you do not distribute additional software intended to replace any component(s) of the Software,
  6. you do not remove or alter any proprietary legends or notices contained in or on the Software,
  7. you only distribute the Software subject to a license agreement that protects Sun's interests consistent with the terms contained in this Agreement, and
  8. you agree to defend and indemnify Sun and its licensors from and against any damages, costs, liabilities, settlement amounts and/or expenses (including attorneys' fees) incurred in connection with any claim, lawsuit or action by any third party that arises or results from the use or distribution of any and all Programs and/or Software.
The term "vendors" used here refers to licensees, developers, and independent software vendors (ISVs) who license and distribute the Java 2 SDK, Standard Edition, with their programs.

Vendors must follow the terms of the Java 2 SDK, Standard Edition, Binary Code License agreement.

Required vs. Optional Files

The files that make up the Java 2 SDK, Standard Edition, are divided into two categories: required and optional. Optional files may be excluded from redistributions of the Java 2 SDK at the vendor's discretion.

The following section contains a list of the files and directories that may optionally be omitted from redistributions of the Java 2 SDK. All files not in these lists of optional files must be included in redistributions of the Java 2 SDK.

Optional Files and Directories

The following files may be optionally excluded from redistributions:
Character conversion classes
sunjce_provider.jar - the SunJCE provider for Java Cryptography APIs
localedata.jar - contains many of the resources needed for non US English locales
ldapsec.jar - contains security features supported by the LDAP service provider
dnsns.jar - for the InetAddress wrapper of JNDI DNS provider
bin/rmid and jre/bin/rmid
Java RMI Activation System Daemon
bin/rmiregistry and jre/bin/rmiregistry
Java Remote Object Registry
bin/tnameserv and jre/bin/tnameserv
Java IDL Name Server
bin/keytool and jre/bin/keytool
Key and Certificate Management Tool
bin/kinit and jre/bin/kinit
Used to obtain and cache Kerberos ticket-granting tickets
bin/klist and jre/bin/klist
Kerberos display entries in credentials cache and keytab
bin/ktab and jre/bin/ktab
Kerberos key table manager
bin/policytool and jre/bin/policytool
Policy File Creation and Management Tool
bin/orbd and jre/bin/orbd
Object Request Broker Daemon
bin/servertool and jre/bin/servertool
Java IDL Server Tool
Archive of source files

In addition, the Java Web Start product may be excluded from redistributions. The Java Web Start product is contained in a file named javaws-1_2-solaris-sparc-i.zip, javaws-1_2-solaris-i586-i.zip, javaws-1_2-linux-i586-i.zip, or javaws-1_2-windows-i586-i.exe, depending on the platform.

Unlimited Strength Java Cryptography Extension

Due to import control restrictions for some countries, the Java Cryptography Extension (JCE) policy files shipped with the Java 2 SDK, Standard Edition and the Java 2 Runtime Environment allow strong but limited cryptography to be used. These files are located at
where <java-home> is the jre directory of the Java 2 SDK or the top-level directory of the Java 2 Runtime Environment.

An unlimited strength version of these files indicating no restrictions on cryptographic strengths is available on the Java 2 SDK web site for those living in eligible countries. Those living in eligible countries may download the unlimited strength version and replace the strong cryptography jar files with the unlimited strength files.

Endorsed Standards Override Mechanism

An endorsed standard is a Java API defined through a standards process other than the Java Community ProcessSM (JCPSM). Because endorsed standards are defined outside the JCP, it is anticipated that such standards will be revised between releases of the Java 2 Platform. In order to take advantage of new revisions to endorsed standards, developers and software vendors may use the Endorsed Standards Override Mechanism to provide newer versions of an endorsed standard than those included in the Java 2 Platform as released by Sun Microsystems.

For more information on the Endorsed Standards Override Mechanism, including the list of platform packages that it may be used to override, see

Classes in the packages listed on that web page may be replaced only by classes implementing a more recent version of the API as defined by the appropriate standards body.

In addition to the packages listed in the document at the above URL, which are part of the Java 2 Platform, Standard Edition (J2SETM) specification, redistributors of Sun's J2SE Reference Implementation are allowed to override classes whose sole purpose is to implement the functionality provided by public APIs defined in these Endorsed Standards packages. Redistributors may also override classes in the org.w3c.dom.* packages, or other classes whose sole purpose is to implement these APIs.

Web Pages

For additional information, refer to these Sun Microsystems pages on the World Wide Web:

The Java 2 SDK, Standard Edition, is a product of Sun MicrosystemsTM, Inc.
This product includes code licensed from RSA Security.

Copyright 2008 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, California 95054, U.S.A.
All rights reserved.