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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 4. 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: 9.4.1-SNAPSHOT</span></td><td style="width: 50%"><script type="text/javascript"> (function() {
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</script><gcse:search></gcse:search></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> </td><th width="60%" align="center">Chapter 4. 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"> <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
<span class="website">www.webtide.com</span></a></h5><p>
private support for your internal/customer projects ... custom extensions and distributions ... versioned snapshots for indefinite support ...
scalability guidance for your apps and Ajax/Comet projects ... development services for sponsored feature development
</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’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">${jetty.home}/etc/jetty-deploy.xml</code> file.</p><pre xmlns:jfetch="java:org.eclipse.jetty.xslt.tools.JavaSourceFetchExtension" xmlns:fetch="java:org.eclipse.jetty.xslt.tools.SourceFetchExtension" xmlns:d="http://docbook.org/ns/docbook" xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0" xmlns:xslthl="http://xslthl.sf.net" xmlns:gcse="http://www.google.com" xmlns:date="http://exslt.org/dates-and-times"><code><?xml version="1.0"?>
<!DOCTYPE Configure PUBLIC "-//Jetty//Configure//EN" "http://www.eclipse.org/jetty/configure_9_3.dtd">
<Configure id="Server" class="org.eclipse.jetty.server.Server">
<Call name="addBean">
<Arg>
<New id="DeploymentManager" class="org.eclipse.jetty.deploy.DeploymentManager">
<Set name="contexts">
<Ref refid="Contexts" />
</Set>
<Call name="setContextAttribute">
<Arg>org.eclipse.jetty.server.webapp.ContainerIncludeJarPattern</Arg>
<Arg>.*/[^/]*servlet-api-[^/]*\.jar$|.*/javax.servlet.jsp.jstl-.*\.jar$|.*/org.apache.taglibs.taglibs-standard-impl-.*\.jar$</Arg>
</Call>
<Call id="webappprovider" name="addAppProvider">
<Arg>
<New class="org.eclipse.jetty.deploy.providers.WebAppProvider">
<Set name="monitoredDirName"><Property name="jetty.base" default="." />/<Property name="jetty.deploy.monitoredDir" deprecated="jetty.deploy.monitoredDirName" default="webapps"/></Set>
<Set name="defaultsDescriptor"><Property name="jetty.home" default="." />/etc/webdefault.xml</Set>
<Set name="scanInterval"><Property name="jetty.deploy.scanInterval" default="1"/></Set>
<Set name="extractWars"><Property name="jetty.deploy.extractWars" default="true"/></Set>
</New>
</Arg>
</Call>
</New>
</Arg>
</Call>
</Configure></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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