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   <title>Non-Persistent Sessions</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="session-management.html" title="Chapter&nbsp;10.&nbsp;Session Management"><link rel="prev" href="session-configuration-sessioncache.html" title="The L1 Session Cache"><link rel="next" href="configuring-sessions-file-system.html" title="Persistent Sessions: File System"><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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      </p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="configuring-sessions-memory"></a>Non-Persistent Sessions</h2></div></div></div><p>Non-clustered, non-persistent, in-memory-only is the default style of session management.
In previous versions of Jetty this was referred to as "hash" sessions, as they were stored in a <code class="literal">HashMap</code> in memory.</p><p>This is delivered by a combination of the <code class="literal">DefaultSessionCache</code> (to keep sessions in memory) and a <code class="literal">NullSessionDataStore</code> (to avoid session persistence).</p><p>If you do nothing, Jetty will instantiate one of each of these objects for each context at startup time using hard-coded defaults.</p><p>To explicitly set up non-persisted sessions using modules, use both the <code class="literal">session-cache-hash</code> and the <code class="literal">session-store-null</code> modules.</p><p>Enabling the modules allows you to configure behavior - see <a class="link" href="session-configuration-sessioncache.html" title="The L1 Session Cache">the L1 Session Cache</a> for detailed information on configuration options for the <code class="literal">DefaultSessionCache</code>.
The <code class="literal">NullSessionDataStore</code> has no customizable options.</p></div><script type="text/javascript">
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