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<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 9 Architecture (9.0.112) - Table of Contents
</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 9 Architecture
</h1><div class="versionInfo">
Version 9.0.112,
<time datetime="2025-11-06">Nov 6 2025
</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
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</a></li></ul></div><div><h2>Contents
</h2><ul><li><a href="index.html">Contents
</a></li><li><a href="overview.html">Overview
</a></li><li><a href="startup.html">Server Startup
</a></li><li><a href="requestProcess.html">Request Process
</a></li></ul></div></nav></div></div><div id="mainRight"><div id="content"><h2>Table of Contents
</h2><h3 id="Preface">Preface
</h3><div class="text">
<p>This section of the Tomcat documentation attempts to explain
the architecture and design of the Tomcat server. It includes significant
contributions from several tomcat developers:
</p>
<ul>
<li>Jeanfrancois Arcand
(
<a href="mailto:jfarcand@apache.org">jfarcand@apache.org
</a>)
</li>
</ul>
</div><h3 id="Table_of_Contents">Table of Contents
</h3><div class="text">
<p>The information presented is divided into the following sections:
</p>
<ul>
<li><a href="overview.html"><strong>Overview
</strong></a> -
An overview of the Tomcat server architecture with key terms
and concepts.
</li>
<li><a href="startup.html"><strong>Server Startup
</strong></a> -
A detailed description, with sequence diagrams, of how the Tomcat
server starts up.
</li>
<li><a href="requestProcess.html"><strong>Request Process Flow
</strong></a> -
A detailed description of how Tomcat handles a request.
</li>
</ul>
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