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Tomcat example source code file (overview.xml)

This example Tomcat source code file (overview.xml) is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Tomcat tags/keywords

a, apache, engine, engine, host, in, license, license, server, service, service, the, tomcat, tomcat

The Tomcat overview.xml source code

<?xml version="1.0"?>
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
  this work for additional information regarding copyright ownership.
  The ASF licenses this file to You under the Apache License, Version 2.0
  (the "License"); you may not use this file except in compliance with
  the License.  You may obtain a copy of the License at

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  See the License for the specific language governing permissions and
  limitations under the License.
<!DOCTYPE document [
  <!ENTITY project SYSTEM "project.xml">
<document url="overview.html">


    <author email="">Yoav Shapira
    <title>Architecture Overview


<section name="Overview">
This page provides an overview of the Tomcat server architecture.

<section name="Terms">

<subsection name="Server">
In the Tomcat world, a
<a href="../config/server.html">Server represents the whole container.
Tomcat provides a default implementation of the 
<a href="../catalina/docs/api/org/apache/catalina/Server.html">Server interface.,
and this is rarely customized by users.

<subsection name="Service">
A <a href="../config/service.html">Service is an intermediate component
which lives inside a Server and ties one or more Connectors to exactly one
Engine.  The Service element is rarely customized by users, as the default
implementation is simple and sufficient:
<a href="../catalina/docs/api/org/apache/catalina/Service.html">Service interface.

<subsection name="Engine">
<a href="../config/engine.html">Engine represents request processing
pipeline for a specific Service.  As a Service may have multiple Connectors,
the Engine received and processes all requests from these connectors, handing
the response back to the appropriate connector for transmission to the client.
The <a href="../catalina/docs/api/org/apache/catalina/Engine.html">Engine interface
may be implemented to supply custom Engines, though this is uncommon.
Note that the Engine may be used for Tomcat server clustering via the
jvmRoute parameter.  Read the Clustering documentation for more information.

<subsection name="Host">
A <a href="../config/host.html">Host is an association of a network name,
e.g., to the Tomcat server.  An Engine may contain
multiple hosts, and the Host element also supports network aliases such as and  Users rarely create custom
<a href="../catalina/docs/api/org/apache/catalina/Host.html">Hosts
because the 
<a href="../catalina/docs/api/org/apache/catalina/core/StandardHost.html">StandardHost
implementation</a> provides significant additional functionality.

<subsection name="Connector">
A Connector handles communications with the client.  There are multiple
connectors available with Tomcat, all of which implement the 
<a href="../catalina/docs/api/org/apache/catalina/Connector.html">Connector
interface.</a>  These include the
<a href="../config/coyote.html">Coyote connector which is used for
most HTTP traffic, especially when running Tomcat as a standalone server, 
and the <a href="../config/jk2.html">JK2 connector which implements
the AJP procotol used when connecting Tomcat to an Apache HTTPD server.
Creating a customized connector is a significant effort.

<subsection name="Context">
<a href="../config/context.html">Context
represents a web application.  A Host may contain multiple
contexts, each with a unique path.  The
<a href="../catalina/docs/api/org/apache/catalina/Context.html">Context
interface</a> may be implemented to create custom Contexts, but
this is rarely the case because the
<a href="../catalina/docs/api/org/apache/catalina/core/StandardContext.html">
StandardContext</a> provides significant additional functionality.

<section name="Comments">
Tomcat is designed to be a fast and efficient implementation of the
Servlet Specification.  Tomcat came about as the reference implementation
of this specification, and has remained rigorous in adhering to the
specification.  At the same time, significant attention has been paid
to Tomcat's performance and it is now on par with other servlet containers,
including commercial ones.
In recent releases of Tomcat, mostly starting with Tomcat 5,
we have begun effots to make more aspects of Tomcat managable via
JMX.  In addition, the Manager and Admin webapps have been greatly
enhanced and improved.  Managability is a primary area of concern
for us as the product matures and the specification becomes more


Other Tomcat examples (source code examples)

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