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Configuring & Using Apache Tomcat
A Tutorial on Installing, Configuring, and Using
Tomcat 7 with Eclipse (Details here)
Recommended for Most Developers
Tomcat 6 with Eclipse (Details here)
Old! Only if Servlet 2.5/2.4 Compatibility Needed
Manual Tomcat 6 Execution (Details here)
Using Tomcat as a deployment server or integrating Tomcat as a plugin within the regular Apache server or a commercial Web server is more complicated than what is described in this tutorial. Although such integration is valuable for a deployment scenario (see http://tomcat.apache.org/tomcat-7.0-doc/), my goal here is to show how to use Tomcat as a development server on your desktop to use for testing when building applications that use JSF 2, servlets/JSP, or other Java-based dynamic Web technologies. Regardless of what deployment server you use, you'll want a standalone server on your desktop to use for development. By far the best way to use Tomcat for development purposes is from inside Eclipse or another IDE. For that, please see the Eclipse and Tomcat 7 integration tutorial or the Eclipse and Tomcat 6 integration tutorial. For using Tomcat manually (not recommended), see the section below.
The examples here assume you are using Windows, but they can be easily adapted for MacOS, Linux, Solaris, and other versions of Unix. Except when I refer to specific Windows paths (e.g., C:\blah\blah), I use URL-style forward slashes for path separators (e.g., install_dir/webapps/ROOT). Adapt as necessary.
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into the top level of the C drive. This should result in C:\apache-tomcat-6.0.28\.
This preconfigured version of Tomcat has the following settings already in place.
For details on customizing this configuration, please see the detailed
- The port is changed from 8080 to 80. This
lets you enter URLs of the form http://localhost/... instead of http://localhost:8080/....
- When you download Tomcat from the Apache site, the port is 8080 in case you have another server running on port 80.
- Servlet reloading is enabled. This lets you
deploy a modified servlet .class file without restarting the server.
- When you download Tomcat from the Apache site, servlet reloading is disabled for performance reasons. You might want it disabled on a server used for a deployed application, but you definitely want it enabled during development.
- The invoker servlet is enabled.
This lets you drop a servlet .class file into webapps/appName/WEB-INF/classes/packageName and
immediately run it with a URL of the form http://localhost/appName/servlet/packageName.ServletName.
That is, the invoker servlet saves you from editing web.xml to give a servlet-mapping to your servlet.
- When you download Tomcat from the Apache site, the invoker servlet is disabled. You DEFINITELY want the invoker servlet disabled on a server used for a deployed application, but having it enabled on your development server is very convenient for quick testing.
- Tomcat monitors struts-config.xml and faces-config.xml.
Whenever either of these files changes, Tomcat automatically reloads the Web
application. This saves you from restarting the server when you change these files.
- If you do not use Struts or JSF, this change will not be beneficial to you. But it does not hurt either way.
- Directory listings are turned on.
If you type a URL ending in / and there is no welcome file in that folder, Tomcat shows a directory listing.
- Directory listings were on by default in previous Tomcat versions. They are not required but are convenient during development.
- The port is changed from 8080 to 80. This lets you enter URLs of the form http://localhost/... instead of http://localhost:8080/....
JAVA_HOME. Set this environment variable to point at the top-level of your Java installation directory (e.g., C:\Program Files\Java\jdk1.6.0_21.) Use the Control Panel, see the sample autoexec.bat file, or read this section of the page on configuring your development environment.
CLASSPATH. Set this environment variable to include ".", C:\Servlets+JSP, and the servlet/JSP JAR files. For details, see the sample autoexec.bat file or this section of the page on configuring your development environment.
For a very quick test, open C:\Servlets+JSP, double click on the shortcut to startup.bat, and open http://localhost/ in your browser. If you see something about Tomcat, the setup was successful. But be sure to do the more complete server tests to verify that you have your development and deployment environment also set up properly.