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    <p>In chronological order of api apperance (as far as I know):</p> <ul> <li>Log4j because most everybody uses it (in my experience)</li> <li>Commons Logging because open source projects use it (so they can integrate with whatever logging framework is used in the integrated solution); especially valid if you're an API/Framework/OSS and you rely on other packages that use Commons Logging.</li> <li>Commons Logging because you don't want to "lock down" to a particular logging framework (so instead you lock down to what Commons Logging gives you instead) - I don't think it is sensible to decide using this point as the reason.</li> <li>Java logging because you don't want to add in an extra jar.</li> <li>SLF4j because it's newer than Commons Logging and provides parameterized logging:</li> </ul> <hr> <pre><code>logger.debug("The entry is {}.", entry); //which expands effectively to if (logger.isDebugEnabled()){ // Note that it's actually *more* efficient than this - see Huxi's comment below... logger.debug("The entry is " + entry + "."); } </code></pre> <ul> <li>Logback because it's newer than log4j and again, supports parameterized logging, as it implements SLF4j directly</li> <li>SLF4j/Logback because it's written by the same guy who did log4j, so he's made it better (according to <a href="https://stackoverflow.com/questions/354837/whats-up-with-logging-in-java#356038">Ken G</a> - thanks. It seems to fit when looking at <a href="http://www.slf4j.org/news.html" rel="nofollow noreferrer">their earlier news posts</a>)</li> <li>SLF4j because they also publish a log4j adapter so you don't have to "switch out" log4j in older code - just make log4j.properties use SLF4j and it's configuration</li> </ul>
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    1. POWhat's Up with Logging in Java?
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    1. POWhat's Up with Logging in Java?
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    1. COAs far as I can tell the idea behind commons logging is that it should be used in libraries. This way the library can always use the same logging framework (via commons logging) that the hosting application uses.
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      1. USJoachim Sauer
    2. COThanks heaps to Loki for the question. I now know that I'm not going to be using log4j as my default framework any more. SLF4j FTW! Also thanks to Ken G for pointing out that SLF4j is written by the same guy as log4j
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    3. COThe comment in your code example isn't 100% correct. The actual formatting of the message is performed lazily by Logback so it will only happen if the event is really handled by an appender *and* the appender requires the formatted message - which wouldn't happen in case of e.g. an SocketAppender since the event is serialized using the unchanged message pattern + the arguments as Strings. I guess it just depends how you define "effectively" though. It would certainly emit the same message (at least if entry and object are the same ;)) so please forgive my nitpicking.
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