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   <title>Hot Deployment</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-deployment.html" title="Chapter&nbsp;4.&nbsp;Deploying to Jetty"><link rel="prev" href="static-content-deployment.html" title="Configuring Static Content Deployment"><link rel="next" href="deployment-architecture.html" title="Deployment Architecture"><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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    </script><link type="text/css" rel="stylesheet" href="css/font-awesome/font-awesome.min.css"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><table 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"><tr><td style="width: 25%"><a href="http://www.eclipse.org/jetty"><img src="images/jetty-header-logo.png" alt="Jetty Logo"></a><br><span style="font-size: small">
            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">Hot Deployment</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="static-content-deployment.html"><i class="fa fa-chevron-left" aria-hidden="true"></i> Previous</a>&nbsp;</td><th width="60%" align="center">Chapter&nbsp;4.&nbsp;Deploying to Jetty<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="deployment-architecture.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="hot-deployment"></a>Hot Deployment</h2></div></div></div><p>Jetty allows for deploying an arbitrary context or web application by monitoring a directory for changes.
If a web application or a context descriptor is added to the directory, Jetty&#8217;s DeploymentManager (DM) deploys a new context.
If a context descriptor is touched or updated, the DM stops, reconfigures, and redeploys its context.
If a context is removed, the DM stops it and removes it from the server.</p><p>This behavior can be controlled by configuring <code class="literal">WebAppProvider</code> properties.</p><div class="variablelist"><dl class="variablelist"><dt><span class="term">monitoredDirName</span></dt><dd>The directory to scan for possible deployable Web Applications (or Deployment Descriptor XML files).</dd><dt><span class="term">scanInterval</span></dt><dd>Number of seconds between scans of the provided <code class="literal">monitoredDirName</code>.
A value of <code class="literal">0</code> disables the continuous hot deployment scan, Web Applications will be deployed on startup only.</dd></dl></div><p>The default location for this configuration is in the <code class="literal">${jetty.home}/etc/jetty-deploy.xml</code> file.</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;?xml version="1.0"?&gt;
&lt;!DOCTYPE Configure PUBLIC "-//Jetty//Configure//EN" "http://www.eclipse.org/jetty/configure_9_3.dtd"&gt;

&lt;Configure id="Server" class="org.eclipse.jetty.server.Server"&gt;

  &lt;Call name="addBean"&gt;
    &lt;Arg&gt;
      &lt;New id="DeploymentManager" class="org.eclipse.jetty.deploy.DeploymentManager"&gt;
        &lt;Set name="contexts"&gt;
          &lt;Ref refid="Contexts" /&gt;
        &lt;/Set&gt;
        &lt;Call name="setContextAttribute"&gt;
          &lt;Arg&gt;org.eclipse.jetty.server.webapp.ContainerIncludeJarPattern&lt;/Arg&gt;
          &lt;Arg&gt;.*/[^/]*servlet-api-[^/]*\.jar$|.*/javax.servlet.jsp.jstl-.*\.jar$|.*/org.apache.taglibs.taglibs-standard-impl-.*\.jar$&lt;/Arg&gt;
        &lt;/Call&gt;

        &lt;Call id="webappprovider" name="addAppProvider"&gt;
          &lt;Arg&gt;
            &lt;New class="org.eclipse.jetty.deploy.providers.WebAppProvider"&gt;
              &lt;Set name="monitoredDirName"&gt;&lt;Property name="jetty.base" default="." /&gt;/&lt;Property name="jetty.deploy.monitoredDir" deprecated="jetty.deploy.monitoredDirName" default="webapps"/&gt;&lt;/Set&gt;
              &lt;Set name="defaultsDescriptor"&gt;&lt;Property name="jetty.home" default="." /&gt;/etc/webdefault.xml&lt;/Set&gt;
              &lt;Set name="scanInterval"&gt;&lt;Property name="jetty.deploy.scanInterval" default="1"/&gt;&lt;/Set&gt;
              &lt;Set name="extractWars"&gt;&lt;Property name="jetty.deploy.extractWars" default="true"/&gt;&lt;/Set&gt;
            &lt;/New&gt;
          &lt;/Arg&gt;
        &lt;/Call&gt;
      &lt;/New&gt;
    &lt;/Arg&gt;
  &lt;/Call&gt;
&lt;/Configure&gt;</code></pre><p>See <a class="xref" href="deployment-architecture.html#default-web-app-provider" title="Understanding the Default WebAppProvider">Understanding the Default WebAppProvider</a> for more configuration details.</p><p>See also <a class="xref" href="deployment-architecture.html" title="Deployment Architecture">Deployment Architecture</a> for detailed conceptual information.</p></div><script type="text/javascript">
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