Log4J is a nifty logging framework for Java applications. Don't re-invent the wheel; give it a try. (Yes, it's supposedly better than the Java logging addition in JDK1.4.).

As an endorsement I can say that JSPWiki uses Log4j for all of its logging needs :-) --JanneJalkanen

BTW, you can use Jakarta commons-logging in order to plug in different logging frameworks, but IMHO just skip the extra level of indirection and use log4j directly. --KenLiu