如何在Glassfish 3中为每个已部署的应用程序配置log4j？

I'm trying to use log4j to handle the logs for a web-service which is running under Glassfish 3. Most of the guides I've seen using log4j with Glassfish want me to mess around with Glassfish global settings, which I want to avoid as there will be more than one application deployed per instance of Glassfish.I'm trying to use log4j to handle the logs for