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copied!<p>Can you explain why you want multiple loggers in more detail? I don't think it's possible to have multiple log4j instances. </p> <p>If you just want multiple appenders, look here: </p> <ul> <li><a href="http://www.velocityreviews.com/forums/t721794-log4j-different-logger-instances.html" rel="noreferrer">http://www.velocityreviews.com/forums/t721794-log4j-different-logger-instances.html</a></li> </ul> <p>Here's the log4j.properties from the above link:</p> <pre><code># logj4.properties log4j.rootCategory = WARN, A log4j.category.com.lewscanon = WARN, F log4j.category.com.lewscanon.mouser = DEBUG, X log4j.appender.A = org.apache.log4j.ConsoleAppender log4j.appender.A.layout = org.apache.log4j.PatternLayout log4j.appender.F = org.apache.log4j.RollingFileAppender log4j.appender.F.layout = org.apache.log4j.PatternLayout log4j.appender.F.File = /projects/mouser/logs/lewscanon.log log4j.appender.F.MaxFileSize = 512KB log4j.appender.F.MaxBackupIndex = 2 log4j.appender.X = org.apache.log4j.RollingFileAppender log4j.appender.X.layout = org.apache.log4j.PatternLayout log4j.appender.X.File = /projects/mouser/logs/mouser.log log4j.appender.X.MaxFileSize = 512KB log4j.appender.X.MaxBackupIndex = 2 log4j.appender.A.layout.ConversionPattern= %d %-16c{1}:%-39m %-t %x%n log4j.appender.F.layout.ConversionPattern= %d %-16c{1}:%-39m %-t %x%n log4j.appender.X.layout.ConversionPattern= %d %-16c{1}:%-39m %-t %x%n </code></pre> <p>These lines:</p> <pre><code>log4j.rootCategory = WARN, A log4j.category.com.lewscanon = WARN, F log4j.category.com.lewscanon.mouser = DEBUG, X </code></pre> <p>say the following:</p> <ul> <li>Log everything to appender A (which is console). Only log warnings and above</li> <li>Log everything from com.lewscanon package to appender F (which goes to file lewscanon.log). Only log warnings and above</li> <li>Log everything from com.lewscannon.mouser package to appender X (which goes to file mouser.log). Only log debug and above</li> </ul> <p>It's also possible to supply full class names:</p> <pre><code>log4j.category.com.lewscanon.SomeClass = WARN, F </code></pre> <p>means log everything from <code>com.lewscanon.SomeClass</code> class to appender F, level warn and above.</p> <p>I suppose the above is granular enough, but if you absolutely need it more granular (I don't think that's practical enough, though), per:</p> <ul> <li><a href="http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/Logger.html" rel="noreferrer">http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/Logger.html</a></li> </ul> <p><code>Logger.getLogger(String name)</code> accepts names. So you can do something like:</p> <pre><code>log4j.category.myFancyLogger = INFO, F </code></pre> <p>and use <code>Logger.getLogger("myFancyLogger")</code> to get the logger that logs to appender F with level info.</p>

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