This project provides an implementation of the java.util.zip classes. The code is pure java (no native code is used), and aims to be compatible with existing java.util.zip implementations.

Version 0.06 of jazzlib shipped in January of 2003. This product is still under development, but I don’t have a clear roadmap, no idea when to expect a 1.0 release.

http://jazzlib.sourceforge.net/