The code base is monitored by a Sonar instance running on analysis.apache.org.
The commons developer mailing list is the main channel of communication for contributors. Please remember that the lists are shared between all commons components, so prefix your email by [text].
You can also visit the #apache-commons IRC channel on irc.freenode.net or peruse JIRA. Specific links of interest for JIRA are:
Alternatively you can go through the Needs Work tags in the TagList report.
If you'd like to offer up pull requests via GitHub rather than applying patches to JIRA, we have a GitHub mirror.
The commons mailing lists act as the main support forum. The user list is suitable for most library usage queries. The dev list is intended for the development discussion. Please remember that the lists are shared between all commons components, so prefix your email by [text].
Bug reports and enhancements are also welcomed via the JIRA issue tracker. Please read the instructions carefully.