How do I configure log4j using log4j.xml to append to different log files based on class name?

Question

I want to set up log4j so that all log meessages produced from classes under package com.foo.bar go to bar.log, and all the log meessages produced from classes under package

Answer 1

This is based on my answer to a similar question:

If you add an appender-ref to the root element, it will also receive com.foo.bar etc messages. You can stop that by specifying 'additivity="false"' on the loggers.