You can use the following methods to contact the Pi4J project or get additional community support/information:
There is an active Java community using Pi4J on the Raspberry Pi forums. You may be able to get answers to questions or assistance much quicker on these forums
Raspberry Pi | Programming | Java Forum
Project communication is conducted on this discussion forum:
https://groups.google.com/forum/#!forum/pi4j
Project announcements are communicated on the Pi4J Twitter account:
https://twitter.com/pi4j
Project bugs and feature request are tracked here:
https://github.com/Pi4J/pi4j-v1/issues
Blog articles on the Pi4J project can be found here:
http://www.savagehomeautomation.com