Suggestions for opensource java projects to contribute to

Hello folks,

I am pretty comfortable with java programming (core java specially) and am kind of coming back to programming after a long hiatus; i want to get my hands dirty really quickly and am looking for good open source java projects. There are some opensource projects that i am passionate about like mozilla-firefox but i dont believe its a java based one.

Only thing really that i am looking for is an open source project where the setup time for someone coming back to java is relatively quick - so i can start coding/bug fixing quickly.

Can anyone suggest some such projects.. or any resources that would point me in that direction.

thanks!
-gariki

i will answer myself; could be useful for someone else later on.

Found some good links:
http://openhatch.org/search/
http://www.apache.org/foundation/getinvolved.html
http://home.java.net/projects/recent