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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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            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">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 <code class="literal">DeploymentManager</code> (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">${jetty.home}/etc/jetty-deploy.xml</code> file.
To modify it as part of the Jetty distribution, first enable the <code class="literal">deploy</code> module.
Once it is enabled, you can edit these properties in either the <code class="literal">$JETTY_BASE/start.d/deploy.ini</code> or <code class="literal">$JETTY_BASE/start.ini</code> file, depending on <a class="link" href="startup-modules.html#start-vs-startd" title="Start.ini vs. Start.d">how your implementation is configured.</a></p><div class="screenexample"><pre class="screen">&lt;?xml version="1.0"?&gt;
# ---------------------------------------
# Module: deploy
# Enables webapplication deployment from the webapps directory.
# ---------------------------------------
--module=deploy

# Monitored directory name (relative to $jetty.base)
# jetty.deploy.monitoredDir=webapps
# - OR -
# Monitored directory path (fully qualified)
# jetty.deploy.monitoredPath=/var/www/webapps

# Defaults Descriptor for all deployed webapps
# jetty.deploy.defaultsDescriptorPath=${jetty.base}/etc/webdefault.xml

# Monitored directory scan period (seconds)
# jetty.deploy.scanInterval=1

# Whether to extract *.war files
# jetty.deploy.extractWars=true</pre></div><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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