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web.xml Namespace Declaration and Schema Location Example

web.xml is the deployment descriptor for a Java web application.

We can specify the namespace declaration and schema location in web.xml file for different Java servlet version:

• Java Servlet 3.1
• Java Servlet 3.0
• Java Servlet 2.5
• Java Servlet 2.4
• Java Servlet 2.3

Note: Please rename the file name from web.xml-servlet-<version>-template.xml to web.xml before you use it in your project.

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web.xml-servlet-2.3-template.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
    <display-name>Java Servlet 2.3 Web Application</display-name>
</web-app>

web.xml-servlet-2.4-template.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
    id="WebApp_ID" version="2.4">

    <display-name>Java Servlet 2.4 Web Application</display-name>

</web-app>

web.xml-servlet-2.5-template.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
    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-app_2_5.xsd"
    id="WebApp_ID" version="2.5">

    <display-name>Java Servlet 2.5 Web Application</display-name>

</web-app>

web.xml-servlet-3.0-template.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app 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-app_3_0.xsd"
    id="WebApp_ID" version="3.0">

    <display-name>Java Servlet 3.0 Web Application</display-name>

</web-app>

web.xml-servlet-3.1-template.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app 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"
    id="WebApp_ID" version="3.1">

    <display-name>Java Servlet 3.1 Web Application</display-name>

</web-app>