This week's giveaway is in the EJB and other Java EE Technologies forum. We're giving away four copies of EJB 3 in Action and have Debu Panda, Reza Rahman, Ryan Cuprak, and Michael Remijan on-line! See this thread for details.
JBoss AS6 does not use log4j as its logging service - i.e. it doesn't ship with its own log4j.xml or log4j.properties. So all you have to do is package a log4j.properties or log4j.xml in your application so that it becomes available in the classpath. This file will then be used by log4j.