This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
If you want to make the logging statements in the example work, just put log4j.jar in your WEB-INF/lib file, provide a log4j.properties file that defines appenders for the examples classes, and the logging statements will start outputting to those appenders. Apache Commons logging will sense the presence of log4j as your underlying logging system.