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POLogging error to stderr and debug, info to stdout with log4j
 

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    <p>I want to add logging to an application I am developing, using apache log4j. At this point I want to redirect all log messages for level INFO and lower (TRACE, DEBUG) to stdout and all other log messages from WARN and above (ERROR, FATAL) to stderr. For example:</p> <pre class="lang-java prettyprint-override"><code>... logger.info("Processing at some point"); // must be written to stdout logger.debug("Point x was processed"); // must be written to stdout logger.warn("Incorrect point config"); // must be written only to stderr logger.error("Exception occurred at point x"); // must be written only to stderr </code></pre> <p>So what should be my log4j.properties file? Here how it looks at this momment:</p> <pre class="lang-sh prettyprint-override"><code>log4j.rootLogger=DEBUG, stdout, stderr # configure stdout # set the conversion pattern of stdout # Print the date in ISO 8601 format log4j.appender.stdout = org.apache.log4j.ConsoleAppender log4j.appender.stdout.Threshold = DEBUG log4j.appender.stdout.Target = System.out log4j.appender.stdout.layout = org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern = %-5p %d [%t][%F:%L] : %m%n # configure stderr # set the conversion pattern of stdout # Print the date in ISO 8601 format log4j.appender.stderr = org.apache.log4j.ConsoleAppender log4j.appender.stderr.Threshold = WARN log4j.appender.stderr.Target = System.err log4j.appender.stderr.layout = org.apache.log4j.PatternLayout log4j.appender.stderr.layout.ConversionPattern = %-5p %d [%t][%F:%L] : %m%n </code></pre> <p>The problem with the above configuration is that the logger.error() ... is printed at stdout too.</p>
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