Basic Introduction into OSGI logging. http://blog.kornr.net/index.php/2008/12/09/understanding-the-osgi-logging-service
Another introduction into OSGI Logging Service. Shows a way to possibly pipe the types of output to command line? http://eclipsesource.com/blogs/2009/03/24/tip-osgi-log-service/
Pax Logging http://team.ops4j.org/wiki/display/paxlogging/Pax+Logging