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    <p>You may use NDC (Nested Diagnostic Context) or MDC (Mapped Diagnostic Context). Below is an example calling the <code>Logger</code> on controller :</p> <pre class="lang-java prettyprint-override"><code>public static StopWatch sw = new StopWatch(); public static void request001() { sw.start(); // start timer // logic of processing the request ... sw.stop(); // stop timer // using MDC to put elapsed time in milisecond MDC.put("processTime", sw.getElapsedTime()); Logger.info("this is request001"); } </code></pre> <p>And the <code>log4j.properties</code> example file should be like follow (using console appender):</p> <pre><code>log4j.rootLogger = INFO, loggerName log4j.appender.loggerName = org.apache.log4j.ConsoleAppender log4j.appender.loggerName.layout = org.apache.log4j.PatternLayout log4j.appender.loggerName.layout.ConversionPattern = %d{dd MMM yyyy HH:mm:ss,SSS} - [%X{processTime}] - %m </code></pre> <p><code>%d{dd MMM yyyy HH:mm:ss,SSS}</code> is used to output the date while<code>%X{processTime}</code> is used to get the <code>processTime</code> value stored in MDC.</p> <p>You can check the references here :</p> <ol> <li><a href="http://logging.apache.org/log4j/1.2/manual.html" rel="nofollow noreferrer">Log4j 1.2 Manual</a></li> <li><a href="http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/PatternLayout.html" rel="nofollow noreferrer"><code>PatternLayout</code> JavaDoc</a></li> <li><a href="https://stackoverflow.com/questions/14134734/log4j-ndc-vs-mdc-difference">What is the difference between Log4j&#39;s NDC and MDC facilities?</a></li> </ol> <hr> <h3>Update</h3> <p><strong>Threshold</strong> properties is represents the <strong>minimum</strong> Level/Priority accepted, not an absolute Level/Priority. So, your <code>JUSTINFO</code> logger should log logger that have priority starting from <code>INFO</code> or higher. </p> <p>If you want to separate the logging message to exactly match the level (absolute level range filter), I think you should consider to replace the log4j.properties to log4j.xml (configuration using xml). I give you example :</p> <pre class="lang-xml prettyprint-override"><code>&lt;!DOCTYPE log4j:configuration SYSTEM "log4j.dtd"&gt; &lt;log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/"&gt; &lt;!-- JUSTINFO logging --&gt; &lt;appender name="JUSTINFO" class="org.apache.log4j.FileAppender"&gt; &lt;param name="File" value="./info.log" /&gt; &lt;param name="Threshold" value="INFO" /&gt; &lt;layout class="org.apache.log4j.PatternLayout"&gt; &lt;param name="ConversionPattern" value="%-5p %t - %m%n"/&gt; &lt;/layout&gt; &lt;filter class="org.apache.log4j.varia.LevelRangeFilter"&gt; &lt;param name="LevelMin" value="INFO" /&gt; &lt;param name="LevelMax" value="INFO" /&gt; &lt;/filter&gt; &lt;/appender&gt; &lt;!-- JUSTERROR logging --&gt; &lt;appender name="JUSTERROR" class="org.apache.log4j.FileAppender"&gt; &lt;param name="File" value="./error.log" /&gt; &lt;layout class="org.apache.log4j.PatternLayout"&gt; &lt;param name="ConversionPattern" value="%-5p %t - %m%n"/&gt; &lt;/layout&gt; &lt;filter class="org.apache.log4j.varia.LevelRangeFilter"&gt; &lt;param name="LevelMin" value="ERROR" /&gt; &lt;param name="LevelMax" value="ERROR" /&gt; &lt;/filter&gt; &lt;/appender&gt; &lt;!-- define root logger priority to ERROR --&gt; &lt;root&gt; &lt;level value="ERROR"/&gt; &lt;appender-ref ref="JUSTINFO"/&gt; &lt;appender-ref ref="JUSTERROR"/&gt; &lt;/root&gt; &lt;/log4j:configuration&gt; </code></pre> <p>Here also a good reference for you :</p> <ol> <li><a href="https://stackoverflow.com/questions/1256835/why-chose-xml-over-properties-files-for-log4j-configuration">Why chose XML over properties files for Log4J configuration?</a></li> <li><a href="https://stackoverflow.com/questions/4825072/how-to-set-filter-in-the-log4j-xml">How to set filter in the log4j.xml</a></li> </ol>
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    1. COthank you for your answer. It worked. But it could not cover whole my problem. I need to write info message to a log file just for info and warn or any error message to another log file. I found an example of custom appender and when I put it in log4j.properties, I got classNotFound exception
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    2. COI updated the question
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    3. COPlease see my updated answer. Hope it useful for you, friend. ;)
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