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    <p>LogBack successes Log4J, it is from the author who made Log4J. Log4J is currently deprecated.</p> <p>Here is an example of where SLF4J / LogBack primes:</p> <p>Log4J (Current)</p> <pre><code>Object entry = new SomeObject(); logger.debug("The new entry is "+entry+"."); </code></pre> <p>Here are the tasks performed:</p> <ol> <li>Java calls on toString method on the variable entry to get the String literal representation. Java initializes space in heap to hold the String object.</li> <li>Java creates a new String based on the above String, with “The new entry is “ and “.”. Java initializes space to hold the yet newer String literal.</li> <li>Java passes on the newly constructed String object as input parameter to Log4J. Log4J checks if the current logging level is DEBUG and above. (assuming it was set to INFO in logging.xml descriptor)</li> <li>Log4J does not print out the String literal into the log, since the logging level is set to INFO. (Therefore all the work on 1 – 2 was wasted) </li> </ol> <p>SLF4J / LogBack (New)</p> <pre><code>Object entry = new SomeObject(); logger.debug("The new entry is {}.", entry); </code></pre> <p>Here are the tasks performed:</p> <ol> <li>Java passes on the String object “The new entry is {}.” and object entry as input parameters to SLF4J. SLF4J checks if the current logging level is DEBUG and above. (assuming it was set to INFO in logging.xml descriptor)</li> <li>Log4J does not print out the String literal into the log, since the logging level is set to INFO. </li> </ol> <p><a href="http://www.slf4j.org/faq.html#logging_performance" rel="noreferrer">http://www.slf4j.org/faq.html#logging_performance</a></p> <p>Ability to replace tomcat-default jul logging with logback/log4j loggin?</p> <blockquote> <p>Yes, use with SLF4J.</p> </blockquote>
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    1. POIs Logback mature enough to replace log4j?
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    1. USOh Chin Boon
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    1. COI can still achieve this if I use slf4j + log4j. Why logback can accomplish this is because it natively uses slf4j, so thats +1 in favour of slf4j, which I anyway DO plan to use irrespective of the decision to go with log4j or logback.
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    2. COAlso log4j just released an [alpha version](http://logging.apache.org/log4j/2.0/index.html) of its 2.0 release on 2012-06-09, so I doubt its deprecated.
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    3. CODefinitely not deprecated, but logback is generally an improvement, is a stable, mature lib, meshes better with SLF4J (which means no crazy classloader magic), so there's little reason to start a new project with log4j.
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      1. USMarko Topolnik
 

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