Resources for Apache Commons
Articles are listed on the ArticlesAndTutorials page.
There are currently 7 known books on Apache Commons. In order of publication:
Applied Software Engineering Using Apache Jakarta Commons by Christian Gross (2003-11), Charles River Media.
Pro Jakarta Commons by Harshad Oak (2004-03), Apress.
Jakarta Commons Cookbook by Tim O'Brien (2004-11 est), O'Reilly.
Jakarta Commons by Torsten Curdt, Stefan Edlich, Henrik Hörning, Reidar Hörning, Software & Support Verlag, in German
Jakarta Commons in Action by Vikram Goyal, Manning.
Third Party Resources
Mailing list archive - Nabble hosts a combined user/dev archive of the commons' lists. The archvie has a clean UI for cross browsing and also a fast search. Users can search here before posting questions to the mailing lists.