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| 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">Deployment Architecture</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="hot-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="quickstart-webapp.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="deployment-architecture"></a>Deployment Architecture</h2></div></div></div><div class="toc"><dl class="toc"><dt><span class="section"><a href="deployment-architecture.html#udm-application-providers">Application Providers</a></span></dt><dt><span class="section"><a href="deployment-architecture.html#udm-application-lifecycle-graph">Application LifeCycle Graph</a></span></dt><dt><span class="section"><a href="deployment-architecture.html#udm-lifecycle-bindings">LifeCycle Bindings</a></span></dt><dt><span class="section"><a href="deployment-architecture.html#default-web-app-provider">Understanding the Default WebAppProvider</a></span></dt></dl></div><p>Jetty is built around an extensible Deployment Manager architecture complete with formal LifeCycle for Web Applications going through it.</p><p>For Jetty to serve content (static or dynamic), a <a class="link" href="http://www.eclipse.org/jetty/javadoc/9.3.28.v20191105/org/eclipse/jetty/server/handler/ContextHandler.html" target="_top">ContextHandler</a> needs to be configured and added to Jetty in the appropriate location. |
| A pluggable <code class="literal">DeploymentManager</code> exists to make this process easier. |
| The Jetty distribution contains example <code class="literal">DeploymentManager</code> configurations to deploy WAR files found in a directory to Jetty, and to deploy Jetty context xml files into Jetty as well.</p><p>The <code class="literal">DeploymentManager</code> is the heart of the typical webapp deployment mechanism; it operates as a combination of an Application LifeCycle Graph, Application Providers that find and provide Applications into the Application LifeCycle Graph, and a set of bindings in the graph that control the deployment process.</p><p><span class="inlinemediaobject"><img src="images/Jetty_DeployManager_DeploymentManager_Roles.png" width="195" alt="image"></span></p><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="udm-application-providers"></a>Application Providers</h3></div></div></div><p>Before Jetty deploys an application, an <a class="link" href="http://www.eclipse.org/jetty/javadoc/9.3.28.v20191105/org/eclipse/jetty/deploy/AppProvider.html" target="_top">AppProvider</a> identifies the App and then provides it to the <code class="literal">DeploymentManager</code>. |
| The main <code class="literal">AppProvider</code> with the Jetty distribution is the <a class="link" href="http://www.eclipse.org/jetty/javadoc/9.3.28.v20191105/org/eclipse/jetty/deploy/providers/WebAppProvider.html" target="_top">WebAppProvider.</a></p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="udm-application-lifecycle-graph"></a>Application LifeCycle Graph</h3></div></div></div><p>The core feature of the <code class="literal">DeploymentManager</code> is the <a class="link" href="http://www.eclipse.org/jetty/javadoc/9.3.28.v20191105/org/eclipse/jetty/deploy/AppLifeCycle.html" target="_top">Application LifeCycle Graph</a>.</p><p><span class="inlinemediaobject"><img src="images/Jetty_DeployManager_AppLifeCycle-1.png" width="340" alt="image"></span></p><p>The nodes and edges of this graph are pre-defined in Jetty along the most common actions and states found. |
| These nodes and edges are not hardcoded; they can be adjusted and added to depending on need (for example, any complex requirements for added workflow, approvals, staging, distribution, coordinated deploys for a cluster or cloud, etc.).</p><p>New applications enter this graph at the Undeployed node, and the <a class="link" href="http://www.eclipse.org/jetty/javadoc/9.3.28.v20191105/org/eclipse/jetty/deploy/DeploymentManager.html#requestAppGoal(org.eclipse.jetty.deploy.App" target="_top"><code class="literal">java.lang.String DeploymentManager.requestAppGoal(App,String)</code></a> method pushes them through the graph.</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="udm-lifecycle-bindings"></a>LifeCycle Bindings</h3></div></div></div><p>A set of default <a class="link" href="http://www.eclipse.org/jetty/javadoc/9.3.28.v20191105/org/eclipse/jetty/deploy/AppLifeCycle.Binding.html" target="_top"><code class="literal">AppLifeCycle.Bindings</code></a> defines standard behavior, and handles deploying, starting, stopping, and undeploying applications. |
| If desired, custom <code class="literal">AppLifeCycle.Bindings</code> can be written and assigned anywhere on the Application LifeCycle graph.</p><p>Examples of new <code class="literal">AppLifeCycle.Binding</code> implementations that can be developed include:</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">Validating the incoming application.</li><li class="listitem">Preventing the deployment of known forbidden applications.</li><li class="listitem">Submitting the installation to an application auditing service in a corporate environment.</li><li class="listitem">Distributing the application to other nodes in the cluster or cloud.</li><li class="listitem">Emailing owner/admin of change of state of the application.</li></ul></div><p>There are four default bindings:</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><a class="link" href="http://www.eclipse.org/jetty/javadoc/9.3.28.v20191105/org/eclipse/jetty/deploy/bindings/StandardDeployer.html" target="_top">StandardDeployer</a> — Deploys the ContextHandler into Jetty in the appropriate place.</li><li class="listitem"><a class="link" href="http://www.eclipse.org/jetty/javadoc/9.3.28.v20191105/org/eclipse/jetty/deploy/bindings/StandardStarter.html" target="_top">StandardStarter</a> — Sets the ContextHandler to started and start accepting incoming requests.</li><li class="listitem"><a class="link" href="http://www.eclipse.org/jetty/javadoc/9.3.28.v20191105/org/eclipse/jetty/deploy/bindings/StandardStopper.html" target="_top">StandardStopper</a> — Stops the ContextHandler and stops accepting incoming requests.</li><li class="listitem"><a class="link" href="http://www.eclipse.org/jetty/javadoc/9.3.28.v20191105/org/eclipse/jetty/deploy/bindings/StandardUndeployer.html" target="_top">StandardUndeployer</a> — Removes the ContextHandler from Jetty.</li></ul></div><p><span class="inlinemediaobject"><img src="images/Jetty_DeployManager_DefaultAppLifeCycleBindings.png" width="851" alt="image"></span></p><p>A fifth, non-standard binding, called <a class="link" href="http://www.eclipse.org/jetty/javadoc/9.3.28.v20191105/org/eclipse/jetty/deploy/bindings/DebugBinding.html" target="_top">DebugBinding</a>, is also available for debugging reasons; it logs the various transitions through the Application LifeCycle.</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="default-web-app-provider"></a>Understanding the Default WebAppProvider</h3></div></div></div><p>The <a class="link" href="http://www.eclipse.org/jetty/javadoc/9.3.28.v20191105/org/eclipse/jetty/deploy/providers/WebAppProvider.html" target="_top">WebAppProvider</a> is used for the deployment of Web Applications packaged as WAR files, expanded as a directory, or declared in a <a class="xref" href="configuring-specific-webapp-deployment.html#deployable-descriptor-file" title="Jetty Deployable Descriptor XML File">Jetty Deployable Descriptor XML File</a>. |
| It supports hot (re)deployment.</p><p>The basic operation of the <code class="literal">WebAppProvider</code> is to periodically scan a directory for deployables. |
| In the standard Jetty Distribution, this is configured in the <code class="literal">${jetty.home}/etc/jetty-deploy.xml</code> file.</p><pre xmlns:jfetch="java:org.eclipse.jetty.xslt.tools.JavaSourceFetchExtension" xmlns:fetch="java:org.eclipse.jetty.xslt.tools.SourceFetchExtension" xmlns:d="http://docbook.org/ns/docbook" xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0" xmlns:xslthl="http://xslthl.sf.net" xmlns:gcse="http://www.google.com" xmlns:date="http://exslt.org/dates-and-times"><code><?xml version="1.0"?> |
| <!DOCTYPE Configure PUBLIC "-//Jetty//Configure//EN" "http://www.eclipse.org/jetty/configure_9_0.dtd"> |
| <Configure id="Server" class="org.eclipse.jetty.server.Server"> |
| |
| <Call name="addBean"> |
| <Arg> |
| <New id="DeploymentManager" class="org.eclipse.jetty.deploy.DeploymentManager"> |
| <Set name="contexts"> |
| <Ref refid="Contexts" /> |
| </Set> |
| <Call id="webappprovider" name="addAppProvider"> |
| <Arg> |
| <New class="org.eclipse.jetty.deploy.providers.WebAppProvider"> |
| <Set name="monitoredDirName"><Property name="jetty.home" default="." />/webapps</Set> |
| <Set name="defaultsDescriptor"><Property name="jetty.home" default="." />/etc/webdefault.xml</Set> |
| <Set name="scanInterval">1</Set> |
| <Set name="extractWars">true</Set> |
| </New> |
| </Arg> |
| </Call> |
| </New> |
| </Arg> |
| </Call> |
| </Configure></code></pre><p>The above configuration will create a <code class="literal">DeploymentManager</code> tracked as a Server LifeCycle Bean, with the following configuration.</p><div class="variablelist"><dl class="variablelist"><dt><span class="term">contexts</span></dt><dd>A passed in reference to the HandlerContainer into which the discovered webapps are deployed. |
| This is normally a reference that points to the <code class="literal">id="Contexts"</code> found in the <code class="literal">${jetty.home}/etc/jetty.xml</code> file, which itself is an instance of <code class="literal">ContextHandlerCollection</code>.</dd><dt><span class="term">monitoredDirName</span></dt><dd><p class="simpara">The file path or URL to the directory to scan for web applications.</p><pre class="literallayout">Scanning follows these rules:</pre><div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">A base directory must exist.</li><li class="listitem">Hidden Files (starting with <code class="literal">"."</code>) are ignored.</li><li class="listitem">Directories with names ending in <code class="literal">".d"</code> are ignored.</li><li class="listitem">Common CVS directories <code class="literal">"CVS"</code> and <code class="literal">"CVSROOT"</code> are ignored.</li><li class="listitem">Any <code class="literal">*.war</code> files are considered <a class="link" href="automatic-webapp-deployment.html" title="Automatic Web Application Deployment">automatic deployables</a>.</li><li class="listitem">Any <code class="literal">*.xml</code> files are considered <a class="link" href="configuring-specific-webapp-deployment.html#deployable-descriptor-file" title="Jetty Deployable Descriptor XML File">context descriptor deployables</a>.</li><li class="listitem">In the special case where both a WAR file and XML file exists for same base name, the XML file is assumed to configure and reference the WAR file (see <a class="xref" href="configuring-specific-webapp-deployment.html" title="Configuring a Specific Web Application Deployment">Configuring a Specific Web Application Deployment</a>). |
| Since jetty-9.2.7, if either the WAR file or its corresponding XML file changes, the webapp will be redeployed.</li><li class="listitem">A directory is considered to be deployable.</li><li class="listitem">In the special case where both a Directory and WAR file of the same name exists, the WAR file is assumed to be an automatic deployable.</li><li class="listitem">In the special case where both a Directory and XML file of the same name exists, the XML file is assumed to configure and reference the Directory.</li><li class="listitem">All other directories are subject to automatic deployment.</li><li class="listitem">If automatic deployment is used, and the special filename <code class="literal">root.war/ROOT.war</code> or directory name <code class="literal">root/ROOT</code> will result in a deployment to the <code class="literal">"/"</code> context path.</li></ol></div></dd><dt><span class="term">defaultsDescriptor</span></dt><dd>Specifies the default Servlet web descriptor to use for all Web Applications. |
| The intent of this descriptor is to include common configuration for the Web Application before the Web Application’s own <code class="literal">/WEB-INF/web.xml</code> is applied. |
| The <code class="literal">${jetty.home}/etc/webdefault.xml</code> that comes with the Jetty distribution controls the configuration of the JSP and Default servlets, along with MIME-types and other basic metadata.</dd><dt><span class="term">scanInterval</span></dt><dd>The period in seconds between sweeps of the <code class="literal">monitoredDirName</code> for changes: new contexts to deploy, changed contexts to redeploy, or removed contexts to undeploy.</dd><dt><span class="term">extractWars</span></dt><dd>If parameter is true, any packed WAR or zip files are first extracted to a temporary directory before being deployed. |
| This is advisable if there are uncompiled JSPs in the web apps.</dd><dt><span class="term">parentLoaderPriority</span></dt><dd>Parameter is a boolean that selects whether the standard Java <a class="link" href="jetty-classloading.html" title="Jetty Classloading">parent first delegation</a> is used or the <a class="link" href="jetty-classloading.html" title="Jetty Classloading">servlet specification webapp classloading priority</a>. |
| The latter is the default.</dd></dl></div></div></div><script type="text/javascript"> |
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