Sample web.xml

web-fragment.xml

<web-fragment version="3.0"
              xmlns="http://java.sun.com/xml/ns/javaee"
              xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
              xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-fragment_3_0.xsd">
</web-fragment>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<!-- Copyright 2006 Sun Microsystems, Inc. All rights reserved. -->
<web-app version="3.1"
         xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">
    <display-name>webapps-caching</display-name>

    <servlet>
        <servlet-name>ServCache</servlet-name>
        <servlet-class>samples.webapps.caching.ServCache</servlet-class>
        <load-on-startup>0</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>ServCache</servlet-name>
        <url-pattern>/ServCache</url-pattern>
    </servlet-mapping>
    <session-config>
        <session-timeout>30</session-timeout>
    </session-config>
    <jsp-config>
        <taglib>
            <taglib-uri>/com/sun/web/taglibs/cache</taglib-uri>
            <taglib-location>/WEB-INF/sun-web-cache.tld</taglib-location>
        </taglib>
    </jsp-config>
</web-app>

• Servlet 2.3 (Source)
• Servlet 2.4 (Source)
• Servlet 2.5 (Source)
• Servlet 3.0
• Servlet 3.1

Reference