ok
Mini Shell
<!DOCTYPE html SYSTEM "about:legacy-compat">
<html lang="en"><head><META http-equiv="Content-Type" content="text/html; charset=UTF-8"><link href="../images/docs-stylesheet.css" rel="stylesheet" type="text/css"><title>Apache Tomcat 8 Configuration Reference (8.5.97) - The SessionIdGenerator Component</title></head><body><div id="wrapper"><header><div id="header"><div><div><div class="logo noPrint"><a href="https://tomcat.apache.org/"><img alt="Tomcat Home" src="../images/tomcat.png"></a></div><div style="height: 1px;"></div><div class="asfLogo noPrint"><a href="https://www.apache.org/" target="_blank"><img src="../images/asf-logo.svg" alt="The Apache Software Foundation" style="width: 266px; height: 83px;"></a></div><h1>Apache Tomcat 8 Configuration Reference</h1><div class="versionInfo">
Version 8.5.97,
<time datetime="2023-12-07">Dec 7 2023</time></div><div style="height: 1px;"></div><div style="clear: left;"></div></div></div></div></header><div id="middle"><div><div id="mainLeft" class="noprint"><div><nav><div><h2>Links</h2><ul><li><a href="../index.html">Docs Home</a></li><li><a href="index.html">Config Ref. Home</a></li><li><a href="https://cwiki.apache.org/confluence/display/TOMCAT/FAQ">FAQ</a></li><li><a href="#comments_section">User Comments</a></li></ul></div><div><h2>Top Level Elements</h2><ul><li><a href="server.html">Server</a></li><li><a href="service.html">Service</a></li></ul></div><div><h2>Executors</h2><ul><li><a href="executor.html">Executor</a></li></ul></div><div><h2>Connectors</h2><ul><li><a href="http.html">HTTP/1.1</a></li><li><a href="http2.html">HTTP/2</a></li><li><a href="ajp.html">AJP</a></li></ul></div><div><h2>Containers</h2><ul><li><a href="context.html">Context</a></li><li><a href="engine.html">Engine</a></li><li><a href="host.html">Host</a></li><li><a href="cluster.html">Cluster</a></li></ul></div><div><h2>Nested Components</h2><ul><li><a href="cookie-processor.html">CookieProcessor</a></li><li><a href="credentialhandler.html">CredentialHandler</a></li><li><a href="globalresources.html">Global Resources</a></li><li><a href="jar-scanner.html">JarScanner</a></li><li><a href="jar-scan-filter.html">JarScanFilter</a></li><li><a href="listeners.html">Listeners</a></li><li><a href="loader.html">Loader</a></li><li><a href="manager.html">Manager</a></li><li><a href="realm.html">Realm</a></li><li><a href="resources.html">Resources</a></li><li><a href="sessionidgenerator.html">SessionIdGenerator</a></li><li><a href="valve.html">Valve</a></li></ul></div><div><h2>Cluster Elements</h2><ul><li><a href="cluster.html">Cluster</a></li><li><a href="cluster-manager.html">Manager</a></li><li><a href="cluster-channel.html">Channel</a></li><li><a href="cluster-membership.html">Channel/Membership</a></li><li><a href="cluster-sender.html">Channel/Sender</a></li><li><a href="cluster-receiver.html">Channel/Receiver</a></li><li><a href="cluster-interceptor.html">Channel/Interceptor</a></li><li><a href="cluster-valve.html">Valve</a></li><li><a href="cluster-deployer.html">Deployer</a></li><li><a href="cluster-listener.html">ClusterListener</a></li></ul></div><div><h2>web.xml</h2><ul><li><a href="filter.html">Filter</a></li></ul></div><div><h2>Other</h2><ul><li><a href="systemprops.html">System properties</a></li><li><a href="jaspic.html">JASPIC</a></li></ul></div></nav></div></div><div id="mainRight"><div id="content"><h2>The SessionIdGenerator Component</h2><h3 id="Table_of_Contents">Table of Contents</h3><div class="text">
<ul><li><a href="#Introduction">Introduction</a></li><li><a href="#Attributes">Attributes</a><ol><li><a href="#Common_Attributes">Common Attributes</a></li><li><a href="#Standard_Implementation">Standard Implementation</a></li></ol></li></ul>
</div><h3 id="Introduction">Introduction</h3><div class="text">
<p>The <strong>SessionIdGenerator</strong> element represents the <em>session
id generator</em> that will be used to create session ids used by
web application HTTP sessions.</p>
<p>A SessionIdGenerator element MAY be nested inside a
<a href="manager.html">Manager</a> component. If it is not included,
a default SessionIdGenerator configuration will be created automatically, which
is sufficient for most requirements, — see
<em>Standard SessionIdGenerator Implementation</em> below for the details
of this configuration.</p>
</div><h3 id="Attributes">Attributes</h3><div class="text">
<div class="subsection"><h4 id="Common_Attributes">Common Attributes</h4><div class="text">
<p>All implementations of <strong>SessionIdGenerator</strong>
support the following attributes:</p>
<table class="defaultTable"><tr><th style="width: 15%;">
Attribute
</th><th style="width: 85%;">
Description
</th></tr><tr><td><code class="attributeName">className</code></td><td>
<p>Java class name of the implementation to use. This class must
implement the <code>org.apache.catalina.SessionIdGenerator</code> interface.
If not specified, the standard value (defined below) will be used.</p>
</td></tr><tr><td><code class="attributeName">jvmRoute</code></td><td>
<p>A routing identifier for this Tomcat instance. It will be added
to the session id to allow for stateless stickiness routing by
load balancers. The details on how the <code>jvmRoute</code>
will be included in the id are implementation dependent.
See <a href="#Standard_Implementation">Standard Implementation</a>
for the default behavior.</p>
<p><strong>NOTE</strong> - The value for this property is inherited
automatically from the <code>jvmRoute</code> attribute of the
<a href="engine.html">Engine</a> element.</p>
</td></tr><tr><td><code class="attributeName">sessionIdLength</code></td><td>
<p>The length of session ids created by this SessionIdGenerator.
The details on how the <code>sessionIdLength</code>
influences the session id length are implementation dependent.
See <a href="#Standard_Implementation">Standard Implementation</a>
for the default behavior.</p>
</td></tr></table>
</div></div>
<div class="subsection"><h4 id="Standard_Implementation">Standard Implementation</h4><div class="text">
<p>Tomcat provides a standard implementations of <strong>SessionIdGenerator</strong>
for use.</p>
<h3>Standard SessionIdGenerator Implementation</h3>
<p>The standard implementation of <strong>SessionIdGenerator</strong> is
<strong>org.apache.catalina.util.StandardSessionIdGenerator</strong>.
It supports the following attributes:</p>
<table class="defaultTable"><tr><th style="width: 15%;">
Attribute
</th><th style="width: 85%;">
Description
</th></tr><tr><td><code class="attributeName">jvmRoute</code></td><td>
<p>A routing identifier for this Tomcat instance. It will be added
to the end of the session id separated by a ".".</p>
</td></tr><tr><td><code class="attributeName">sessionIdLength</code></td><td>
<p>The length of session ids created by this SessionIdGenerator.
More precisely the session id length is twice the value of
<code>sessionIdLength</code> plus the length of the trailing
<code>jvmRoute</code> if given. The factor 2 is because
the session id is constructed using <code>sessionIdLength</code>
random bytes, each byte being encoded in two hex characters
in the actual id. The default value is 16.</p>
</td></tr></table>
</div></div>
</div></div></div></div></div><footer><div id="footer">
Copyright © 1999-2023, The Apache Software Foundation
</div></footer></div></body></html>
Zerion Mini Shell 1.0