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   <title>Jetty XML Usage</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="reference-section.html" title="Chapter&nbsp;32.&nbsp;Jetty XML Reference"><link rel="prev" href="reference-section.html" title="Chapter&nbsp;32.&nbsp;Jetty XML Reference"><link rel="next" href="jetty-xml-config.html" title="jetty.xml"><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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            Version: 9.4.28-SNAPSHOT</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">Jetty XML Usage</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="reference-section.html"><i class="fa fa-chevron-left" aria-hidden="true"></i> Previous</a>&nbsp;</td><th width="60%" align="center">Chapter&nbsp;32.&nbsp;Jetty XML Reference<br><a accesskey="p" href="index.html"><i class="fa fa-home" aria-hidden="true"></i> Home</a></th><td width="20%" align="right">&nbsp;<a accesskey="n" href="jetty-xml-config.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="jetty-xml-usage"></a>Jetty XML Usage</h2></div></div></div><div class="toc"><dl class="toc"><dt><span class="section"><a href="jetty-xml-usage.html#using-jettyxml">Using jetty.xml</a></span></dt><dt><span class="section"><a href="jetty-xml-usage.html#using-multiple-configuration-files">Using Multiple Configuration Files</a></span></dt><dt><span class="section"><a href="jetty-xml-usage.html#setting-parameters-in-configuration-files">Setting Parameters in Configuration Files</a></span></dt></dl></div><p>Jetty provides an XML-based configuration.
It is grounded in Java&#8217;s Reflection API. Classes in the <code class="literal">java.lang.reflect</code> represent Java methods and classes, such that you can instantiate objects and invoke their methods based on their names and argument types.
Behind the scenes, Jetty&#8217;s XML config parser translates the XML elements and attributes into Reflection calls.</p><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="using-jettyxml"></a>Using jetty.xml</h3></div></div></div><p>To use <code class="literal">jetty.xml</code>, specify it as a configuration file when running Jetty.</p><pre 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"><code> java -jar start.jar etc/jetty.xml</code></pre><div class="blockquote"><blockquote class="blockquote"><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="note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title"><i class="fa fa-asterisk" aria-hidden="true"></i> Note</h3><p>If you start Jetty without specifying a configuration file, Jetty automatically locates and uses the default installation <code class="literal">jetty.xml</code> file.
Therefore <code class="literal">java -jar start.jar</code> is equivalent to <code class="literal">java -jar start.jar etc/jetty.xml</code> .</p></div></blockquote></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="using-multiple-configuration-files"></a>Using Multiple Configuration Files</h3></div></div></div><p>You are not limited to one configuration file; you can use multiple configuration files when running Jetty, and Jetty will configure the appropriate server instance.
The ID of the server in the <code class="literal">&lt;Configure&gt;</code> tag specifies the instance you want to configure.
Each server ID in a configuration file creates a new server instance within the same JVM.
If you use the same ID across multiple configuration files, those configurations are all applied to the same server.</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="setting-parameters-in-configuration-files"></a>Setting Parameters in Configuration Files</h3></div></div></div><p>You can set parameters in configuration files either with system properties (using <code class="literal">&lt;SystemProperty&gt;</code>) or properties files (using <code class="literal">&lt;Property&gt;</code>) passed via the command line.
For example, this code in <code class="literal">jetty.xml</code> allows the port to be defined on the command line, falling back onto `8080`if the port is not specified:</p><pre 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"><code>  &lt;Set name="port"&gt;&lt;SystemProperty name="jetty.http.port" default="8080"/&gt;&lt;/Set&gt;</code></pre><p>Then you modify the port while running Jetty by using this command:</p><pre 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"><code> java -Djetty.http.port=8888 -jar start.jar etc/jetty.xml</code></pre><p>An example of defining both system properties and properties files from the command line:</p><pre 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"><code> java -Djetty.http.port=8888 -jar start.jar myjetty.properties etc/jetty.xml etc/other.xml</code></pre></div></div><script type="text/javascript">
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