Note that if you use any of the web.xml snippets below, you should
take care to position the elements in your target web.xml carefully.
Tomcat 4, for instance, requires tags in a particular order (it will
usually work to keep servlet declarations grouped together and servlet
mappings grouped together).

Descriptive things, if you wish.

  <display-name>Red Hat CCM</display-name>

  <description>Red Hat Content and Collaboration Management</description>

  <context-param>
    <param-name>webmaster</param-name>
    <param-value>webmaster@yourdomain.com</param-value>
    <description>
      The email address of the administrator to whom questions
      and comments about this application should be addressed.
    </description>
  </context-param>

To turn on database health monitoring:

  <servlet>
    <servlet-name>db-tester</servlet-name>
    <servlet-class>com.arsdigita.web.monitoring.DBTestServlet</servlet-class>
  </servlet>

  <servlet-mapping>
    <servlet-name>db-tester</servlet-name>
    <url-pattern>/__ccm__/monitoring/db-test</url-pattern>
  </servlet-mapping>

The prefixer servlet adds prefixes to chosen classes of requests.
This is useful if you wish to migrate users off the old dispatcher to
the new dispatcher, which uses a prefix for URLs.  The following
snippet assumes your dispatcher is mapped to "/ccm/*".

  <servlet>
    <servlet-name>prefixer</servlet-name>
    <servlet-class>com.arsdigita.web.PrefixerServlet</servlet-class>
    <init-param>
      <param-name>prefix</param-name>
      <param-value>/ccm</param-value>
    </init-param>
  </servlet>

  <servlet-mapping>
    <servlet-name>prefixer</servlet-name>
    <url-pattern>/register/*</url-pattern>
  </servlet-mapping>

  <servlet-mapping>
    <servlet-name>prefixer</servlet-name>
    <url-pattern>/permissions/*</url-pattern>
  </servlet-mapping>

  <servlet-mapping>
    <servlet-name>prefixer</servlet-name>
    <url-pattern>/categorization/*</url-pattern>
  </servlet-mapping>

  <servlet-mapping>
    <servlet-name>prefixer</servlet-name>
    <url-pattern>/formbuilder/*</url-pattern>
  </servlet-mapping>

  <servlet-mapping>
    <servlet-name>prefixer</servlet-name>
    <url-pattern>/admin/*</url-pattern>
  </servlet-mapping>

The internal prefixer allows arbitrary prefixes to be set up in web.xml such as 
/textonly, /printer, /debug, etc. This enables the entire site to be switched
to alternative modes of operation e.g., completely switching to an alternative 
set of stylesheets.
Today you will most likely use CSS capabilities to achieve that.
  <servlet>
    <servlet-name>TextOnlyServlet</servlet-name>
    <display-name>Text Only Servlet</display-name>
    <servlet-class>com.arsdigita.web.InternalPrefixerServlet</servlet-class>
    <init-param>
        <param-name>prefix</param-name>
        <param-value>/text</param-value>
    </init-param>
  </servlet>

  <servlet-mapping>
    <servlet-name>TextOnlyServlet</servlet-name>
    <url-pattern>/text/*</url-pattern>
  </servlet-mapping>

  <servlet>
    <servlet-name>PrintFriendlyServlet</servlet-name>
    <display-name>Printer Friendly Output Servlet</display-name>
    <servlet-class>com.arsdigita.web.InternalPrefixerServlet</servlet-class>
    <init-param>
        <param-name>prefix</param-name>
        <param-value>/print</param-value>
    </init-param>
  </servlet>

  <servlet-mapping>
    <servlet-name>PrintFriendlyServlet</servlet-name>
    <url-pattern>/print/*</url-pattern>
  </servlet-mapping>



Define the default session timeout for your application, in minutes.
From a servlet or JSP page, you can modify the timeout for a
particular session dynamically by using
HttpSession.getMaxInactiveInterval().

  <session-config>
    <session-timeout>30</session-timeout>
  </session-config>

This servlet is used for Cactus Unit testing.

  <servlet>
    <servlet-name>ServletRedirector</servlet-name>
    <servlet-class>org.apache.commons.cactus.server.ServletTestRedirector</servlet-class>
    <load-on-startup>3</load-on-startup>
  </servlet>

  <servlet-mapping>
    <servlet-name>ServletRedirector</servlet-name>
    <url-pattern>/ServletRedirector</url-pattern>
  </servlet-mapping>