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POSubclassing org.apache.log4j.Logger without altering %C?
 

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    <p>To enable things like </p> <pre><code>logger.info("This is a formatted number: %.2f", number) </code></pre> <p>I decided to write a subclass of <code>org.apache.log4j.Logger</code>. I know, I could have written a wrapper class to achieve the same result but since I'm adding a lot of appenders to the logger at runtime I prefer to use inheritance.</p> <p>The subclass looks like this:</p> <pre><code>public final class FormatLogger extends Logger { private final static FormatLoggerFactory factory = new FormatLoggerFactory(); protected FormatLogger(String name) { super(name); } public static Logger getLogger(String name) { return Logger.getLogger(name, factory); } public void fatal(String formatter, Object... args) { log(Level.FATAL, formatter, args); } public void log(Level level, String formatter, Object... args) { if (super.isEnabledFor(level)) { super.log(level, String.format(formatter, args)); } } } </code></pre> <p>Everything works nicely - everything but one thing: the message text now adds the name of the logger subclass instead of the name of the class calling the logger. As pattern layout, I use the following format: </p> <pre><code>[%d{yyyyMMdd HHmmss}] %-5p [%t] %C: %m%n </code></pre> <p>i.e. things look like this:</p> <pre><code>[20110525 214515] INFO [main] org.xyz.FormatLogger: This is a formatted number: 23.23 </code></pre> <p>instead of:</p> <pre><code>[20110525 214515] INFO [main] org.xyz.Main: This is a formatted number: 23.23 </code></pre> <p>Is there some way to do such thing "properly" so that "%C" keeps printing the original class name?</p>
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    1. COYou could just use log5j, which is a wrapper around log4j that provides a vararg-style logger interface. No reason to reinvent the wheel. http://code.google.com/p/log5j/
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    2. COA minor addition to a polished product isn't reinventing the wheel, IHMO. For me, switching to another library and migrate all existing log4j calls is much more of a hassle than adding a few lines of code. Of course, if one starts a new project, it will make sense to use log5j or logcenter.
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