OpenJDK : Java Glossary

OpenJDK

Sun has released much of the JDK 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, presumably because they licenced it from someone else. The encumbrances are in the sound system, font rasterizer, graphics rasterizer, SNMP and JCE areas.
The Applet plugin
earlier versions of the JDK

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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