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copied!<p>Log4j has been around for a long time, and it works very well. I have no scientific study to back it, but based on what I've seen at a large number of clients, it is easily the logging framework that I see used more than any other. It has been around for a long time, and not been replaced by the Next Big Logging Framework, which says something. </p> <p>It is dead simple to set up, and easy to learn the basic appenders (outputs). There are a whole host appenders that are available, including:</p> <ol> <li>ConsoleAppender</li> <li>DailyRollingFileAppender</li> <li>ExternallyRolledFileAppender </li> <li>FileAppender</li> <li>JDBCAppender</li> <li>JMSAppender</li> <li>NTEventLogAppender</li> <li>RollingFileAppender</li> <li>SMTPAppender</li> <li>SocketAppender</li> <li>SyslogAppender</li> <li>TelnetAppender</li> <li>WriterAppender</li> </ol> <p>Plus others. It isn't difficult to write your own appender either. Additionally there is a great deal of flexibility in each of the appenders that allow you to control specifically what is output in your log.</p> <p>One note, I had a series of classloader problems when I used apache commons logging in addition to log4j. It was only for one specific application, but I found it simpler to use log4j alone, rather than to have the flexibility offered when using an abstraction layer like commons logging. </p> <p>See this article for <a href="http://www.qos.ch/logging/thinkAgain.jsp" rel="noreferrer">more details</a>:</p> <p>Good luck!</p>

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