OpenJDK : Java Glossary

* 0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z (all)

Sun has released much of the Java version 1.6 as open source. It includes:

Javac.exe, the Java compiler
most of the class libraries

They have not released:

4% of the class library code because some of the class library code is encumbered meaning that Sun can’t release it under the GPL (Gnu Public Licence), presumably because they licenced it from someone else. The encumbrances are in the sound system, font rasterizer, graphics rasterizer, SNMP (Simple Network Management Protocol) and JCE (Java Cryptography Extension) areas.
The Applet plug-in
earlier versions of the JDK (Java Development Kit)

Sun previously allowed you to look at the code if you signed an agreement that many programmers such as myself were unwilling to sign. With OpenJDK there will be many more eyes looking over the code for bugs and security leaks.

GPL
IcedTea
JDK
JRE
open source

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