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Code Editor : sessionidgenerator.html

<html><head><META http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>Apache Tomcat 7 Configuration Reference (7.0.107) - The SessionIdGenerator Component</title><style type="text/css" media="print">
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</style></head><body bgcolor="#ffffff" text="#000000" link="#525D76" alink="#525D76" vlink="#525D76"><table border="0" width="100%" cellspacing="0"><tr><td><a href="https://tomcat.apache.org/"><img src="../images/tomcat.gif" align="right" alt="
    The Apache Tomcat Servlet/JSP Container
  " border="0"></a></td><td><h1><font face="arial,helvetica,sanserif">Apache Tomcat 7</font></h1><font face="arial,helvetica,sanserif">Version 7.0.107, Nov 18 2020</font></td><td><a href="http://www.apache.org/"><img src="../images/asf-logo.svg" align="right" alt="Apache Logo" border="0" style="width: 266px;height: 83px;"></a></td></tr></table><table border="0" width="100%" cellspacing="4"><tr><td colspan="2"><hr noshade size="1"></td></tr><tr><td width="20%" valign="top" nowrap class="noPrint"><p><strong>Links</strong></p><ul><li><a href="../index.html">Docs Home</a></li><li><a href="index.html">Config Ref. Home</a></li><li><a href="https://wiki.apache.org/tomcat/FAQ">FAQ</a></li><li><a href="#comments_section">User Comments</a></li></ul><p><strong>Top Level Elements</strong></p><ul><li><a href="server.html">Server</a></li><li><a href="service.html">Service</a></li></ul><p><strong>Executors</strong></p><ul><li><a href="executor.html">Executor</a></li></ul><p><strong>Connectors</strong></p><ul><li><a href="http.html">HTTP</a></li><li><a href="ajp.html">AJP</a></li></ul><p><strong>Containers</strong></p><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><p><strong>Nested Components</strong></p><ul><li><a href="globalresources.html">Global Resources</a></li><li><a href="jar-scanner.html">JarScanner</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><p><strong>Cluster Elements</strong></p><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><p><strong>web.xml</strong></p><ul><li><a href="filter.html">Filter</a></li></ul><p><strong>Other</strong></p><ul><li><a href="systemprops.html">System properties</a></li></ul></td><td width="80%" valign="top" align="left" id="mainBody"><h1>The SessionIdGenerator Component</h1><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Table of Contents"></a><a name="Table_of_Contents"><strong>Table of Contents</strong></a></font></td></tr><tr><td><blockquote>
<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>
</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Introduction"><strong>Introduction</strong></a></font></td></tr><tr><td><blockquote>

<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, &mdash; see
  <em>Standard SessionIdGenerator Implementation</em> below for the details
  of this configuration.</p>

</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Attributes"><strong>Attributes</strong></a></font></td></tr><tr><td><blockquote>

<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Common Attributes"></a><a name="Common_Attributes"><strong>Common Attributes</strong></a></font></td></tr><tr><td><blockquote>

<p>All implementations of <strong>SessionIdGenerator</strong>
    support the following attributes:</p>

<table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Attribute</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><code class="attributeName">className</code></td><td align="left" valign="center">
        <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 align="left" valign="center"><code class="attributeName">jvmRoute</code></td><td align="left" valign="center">
        <p>A routing identifier for this Tomcat instance. It will be added
        to the session id to allow for stateless stickyness 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 align="left" valign="center"><code class="attributeName">sessionIdLength</code></td><td align="left" valign="center">
        <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>

</blockquote></td></tr></table>

<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Standard Implementation"></a><a name="Standard_Implementation"><strong>Standard Implementation</strong></a></font></td></tr><tr><td><blockquote>

<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 border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Attribute</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><code class="attributeName">jvmRoute</code></td><td align="left" valign="center">
        <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 align="left" valign="center"><code class="attributeName">sessionIdLength</code></td><td align="left" valign="center">
        <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>

</blockquote></td></tr></table>

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        </em></font></div></td></tr></table></body></html>

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Code Editor : sessionidgenerator.html