How to Debug a Particular Java Class in CQ

It sometimes becomes necessary to make a particular package or class spit out DEBUG level log entries in order to troubleshoot problems.

1) From the error.log, determine the class that is causing trouble e.g. CQ LinkChecker (com.day.cq.rewriter.linkchecker.impl.LinkCheckerTask)

2) Add a DEBUG logger configuration for that class.

In the OSGi configuration console at /system/console/configMgr, search for “Apache Sling Logger Configuration” and click the plus sign to its right. The class name should be in the field labeled “Logger”. See the example below.
3) Click ‘Save".

4) Checks the CQ /logs folder for the log.

NOTE: To get a system-wide view of all of these many logger configurations, navigate to /system/console/slinglog