This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
log4j is one possibility, as is the Java logging packgae (which requires at least Java 1.4). You could also look into Jakarta Commons Logging, which can act as a frontend for both these packages (and some others), and lets you switch between them easily.