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<title>Example: Logging with Logback</title><link rel="stylesheet" type="text/css" href="css/docbook.css"><meta name="generator" content="DocBook XSL Stylesheets V1.79.1"><meta name="keywords" content="jetty, servlet, servlet-api, cometd, http, websocket, eclipse, maven, java, server, software"><link rel="home" href="index.html" title="Jetty"><link rel="up" href="configuring-logging.html" title="Chapter 11. Jetty Logging"><link rel="prev" href="example-logging-java-util-logging-native.html" title="Example: Logging with Java’s java.util.logging via JavaUtilLog"><link rel="next" href="example-slf4j-multiple-loggers.html" title="Example: Capturing Multiple Logging Frameworks with Slf4j"><link 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" rel="shortcut icon" href="images/favicon.ico"><link rel="stylesheet" href="css/highlighter/foundation.css"><script src="js/highlight.pack.js"></script><script>
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</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="example-logging-logback"></a>Example: Logging with Logback</h2></div></div></div><p>It is possible to have the Jetty Server logging configured so that Logback controls the output of logging events produced by Jetty.
This is accomplished by configuring Jetty for logging to <code class="literal">Logback</code>, which uses <a class="link" href="http://slf4j.org/manual.html" target="_top">Slf4j</a> and the <a class="link" href="http://logback.qos.ch/" target="_top">Logback Implementation for Slf4j</a>.</p><p>A convenient replacement <code class="literal">logging</code> module has been created to bootstrap the <code class="literal">${jetty.base}</code> directory for logging with logback.</p><div class="screenexample"><pre class="screen">[mybase]$ mkdir modules
[mybase]$ cd modules
[modules]$ curl -O https://raw.githubusercontent.com/jetty-project/logging-modules/master/logback/logging.mod
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 742 100 742 0 0 2196 0 --:--:-- --:--:-- --:--:-- 2201
[modules]$ cd ..
[mybase]$ java -jar /opt/jetty-dist/start.jar --add-to-start=logging
INFO: logging initialised in ${jetty.base}/start.ini (appended)
MKDIR: ${jetty.base}/logs
DOWNLOAD: http://central.maven.org/maven2/org/slf4j/slf4j-api/1.6.6/slf4j-api-1.6.6.jar to lib/logging/slf4j-api-1.6.6.jar
DOWNLOAD: http://central.maven.org/maven2/ch/qos/logback/logback-core/1.0.7/logback-core-1.0.7.jar to lib/logging/logback-core-1.0.7.jar
DOWNLOAD: http://central.maven.org/maven2/ch/qos/logback/logback-classic/1.0.7/logback-classic-1.0.7.jar to lib/logging/logback-classic-1.0.7.jar
DOWNLOAD: https://raw.githubusercontent.com/jetty-project/logging-modules/master/logback/logback.xml to resources/logback.xml
DOWNLOAD: https://raw.githubusercontent.com/jetty-project/logging-modules/master/logback/jetty-logging.properties to resources/jetty-logging.properties
[mybase]$ 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">${jetty.base}/modules/</code> directory for use by <code class="literal">mybase</code> only.</li><li class="listitem"><p class="simpara">The <code class="literal">start.jar --add-to-start=logging</code> command performs a number of steps to make the logging module available to the <code class="literal">${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">Required libraries are downloaded (if not present already) to the <code class="literal">${jetty.base}/lib/logging/</code> directory: slf4j-api, logback-core, and logback-classic.</li><li class="listitem">Required configuration files are downloaded (if not present already) to the <code class="literal">${jetty.base}/lib/resources/</code> directory.: <code class="literal">jetty-logging.properties</code>, and <code class="literal">logback.xml</code>.</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 Logback, using the Logback configuration found in <code class="literal">mybase/resources/logback.xml</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 logback-classic.jar, making all Jetty + Slf4j + Logback events emitted by the Jetty server go to Logback for routing (to console, file, syslog, etc…​).</p></div><script type="text/javascript">
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