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| Version: 9.3.28.v20191105</span></td><td style="width: 50%"></td></tr></table><div xmlns:jfetch="java:org.eclipse.jetty.xslt.tools.JavaSourceFetchExtension" xmlns:fetch="java:org.eclipse.jetty.xslt.tools.SourceFetchExtension" xmlns:d="http://docbook.org/ns/docbook" xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0" xmlns:xslthl="http://xslthl.sf.net" xmlns:gcse="http://www.google.com" xmlns:date="http://exslt.org/dates-and-times" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Example: Logging with Apache Log4j</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="configuring-jetty-request-logs.html"><i class="fa fa-chevron-left" aria-hidden="true"></i> Previous</a> </td><th width="60%" align="center">Chapter 11. Jetty Logging<br><a accesskey="p" href="index.html"><i class="fa fa-home" aria-hidden="true"></i> Home</a></th><td width="20%" align="right"> <a accesskey="n" href="example-logging-java-util-logging.html">Next <i class="fa fa-chevron-right" aria-hidden="true"></i></a></td></tr></table><hr></div><div xmlns:jfetch="java:org.eclipse.jetty.xslt.tools.JavaSourceFetchExtension" xmlns:fetch="java:org.eclipse.jetty.xslt.tools.SourceFetchExtension" xmlns:d="http://docbook.org/ns/docbook" xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0" xmlns:xslthl="http://xslthl.sf.net" xmlns:gcse="http://www.google.com" xmlns:date="http://exslt.org/dates-and-times" class="jetty-callout"><h5 class="callout"><a href="http://www.webtide.com/">Contact the core Jetty developers at |
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| </p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="example-logging-log4j"></a>Example: Logging with Apache Log4j</h2></div></div></div><p>It is possible to have the Jetty Server logging configured so that Log4j controls the output of logging events produced by Jetty. |
| This is accomplished by configuring Jetty for logging to <a class="link" href="http://logging.apache.org/log4j/" target="_top">Apache Log4j</a> via <a class="link" href="http://slf4j.org/manual.html" target="_top">Slf4j</a> and the <a class="link" href="http://slf4j.org/manual.html#swapping" target="_top">Slf4j binding layer for Log4j</a>.</p><p>A convenient replacement <code class="literal">logging</code> module has been created to bootstrap your <code class="literal">${jetty.base}</code> directory for logging with log4j.</p><div class="screenexample"><pre class="screen">[mybase]$ mkdir modules |
| [mybase]$ cd modules |
| |
| [modules]$ curl -O https://raw.githubusercontent.com/jetty-project/logging-modules/master/log4j-1.2/logging.mod |
| % Total % Received % Xferd Average Speed Time Time Time Current |
| Dload Upload Total Spent Left Speed |
| 100 720 100 720 0 0 2188 0 --:--:-- --:--:-- --:--:-- 2188 |
| [modules]$ cd .. |
| |
| [mybase]$ java -jar /opt/jetty-dist/start.jar --add-to-start=logging |
| INFO: logging initialised in ${jetty.base}/start.ini (appended) |
| MKDIR: ${jetty.base}/logs |
| DOWNLOAD: http://central.maven.org/maven2/org/slf4j/slf4j-api/1.6.6/slf4j-api-1.6.6.jar to lib/logging/slf4j-api-1.6.6.jar |
| DOWNLOAD: http://central.maven.org/maven2/org/slf4j/slf4j-log4j12/1.6.6/slf4j-log4j12-1.6.6.jar to lib/logging/slf4j-log4j12-1.6.6.jar |
| DOWNLOAD: http://central.maven.org/maven2/log4j/log4j/1.2.17/log4j-1.2.17.jar to lib/logging/log4j-1.2.17.jar |
| DOWNLOAD: https://raw.githubusercontent.com/jetty-project/logging-modules/master/log4j-1.2/log4j.properties to resources/log4j.properties |
| DOWNLOAD: https://raw.githubusercontent.com/jetty-project/logging-modules/master/log4j-1.2/jetty-logging.properties to resources/jetty-logging.properties |
| INFO: resources initialised transitively |
| INFO: resources enabled in ${jetty.base}/start.ini |
| |
| [mybase]$ java -jar /opt/jetty-dist/start.jar</pre></div><p>The replacement <code class="literal">logging.mod</code> performs a number of tasks.</p><div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"><code class="literal">mybase</code> is a <code class="literal">${jetty.base}</code> directory.</li><li class="listitem">The jetty-distribution is unpacked (and untouched) into <code class="literal">/opt/jetty-dist/</code> and becomes the <code class="literal">${jetty.home}</code> directory for this demonstration.</li><li class="listitem">The <code class="literal">curl</code> command downloads the replacement <code class="literal">logging.mod</code> and puts it into the <code class="literal">${jetty.base}/modules/</code> directory for use by mybase only.</li><li class="listitem"><p class="simpara">The <code class="literal">start.jar --add-to-start=logging</code> command performs a number of steps to make the logging module available to the <code class="literal">${jetty.base}</code> configuration.</p><div class="orderedlist"><ol class="orderedlist" type="a"><li class="listitem">The <code class="literal">--module=logging</code> command is added to the <code class="literal">${jetty.base}/start.ini</code> configuration.</li><li class="listitem">Required <code class="literal">${jetty.base}</code> directories are created: <code class="literal">${jetty.base}/logs</code> and <code class="literal">${jetty.base}/resources</code></li><li class="listitem"><p class="simpara">Required libraries are downloaded (if not present already): slf4j-api, slf4j-log4j, and log4j itself.</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">The libraries are put in the <code class="literal">${jetty.base}/lib/logging/</code> directory.</li></ul></div></li><li class="listitem"><p class="simpara">Required configuration files are downloaded (if not present already): <code class="literal">jetty-logging.properties</code>, and <code class="literal">log4j.properties</code></p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">The configuration files are placed in the <code class="literal">${jetty.base}/resources/</code> directory.</li></ul></div></li></ol></div></li></ol></div><p>At this point the Jetty <code class="literal">mybase</code> is configured so that the Jetty server itself will log using log4j, using the log4j configuration found in <code class="literal">mybase/resources/log4j.properties</code>.</p><p>The server classpath can be verified by using the <code class="literal">start.jar --list-config</code> command.</p><p>In essence, Jetty is now configured to emit its own logging events to slf4j, and slf4j itself is using the static log binder found in <code class="literal">slf4j-log4j12.jar</code>, making all Jetty + Slf4j + Log4j events emitted by the Jetty server go to Log4j for routing (to console, file, syslog, etc…​).</p></div><script type="text/javascript"> |
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