http://www.sureshpw.com/2012/04/dynamic-logging-with-log4j.html
http://www.jroller.com/ray/entry/managing_log4j_logging_levels_for

Enhancement #536: Add MBean support for Log4j

• Author: Pablo Ojanguren
• Status: New
• Priority: High
• Assignee:
• Category: Server side
• Target version:
• Resolution:
• Tags:

We would like to change log4j trace levels via JMX for specific classes / packages.
Check log4j doc first just in case of provided feature.