We want you to contribute to the Mac OS X Port of OpenJDK!
There are only a few things you need to do:
0. Sign the Oracle Contributor Agreement
1. Join the mailing list
2. Have fun hacking!
We have afew resources to help you get started with Cocoa and AppKit if you aren't already familiar with them.
We also have a few pages about how we develop Java on Mac OS X
Overview
Content Tools
ThemeBuilder