The JSF is based on the MVC framework and has an in built controller. So we need to map the controller in the web.xml file for the web application in order to make the application JSF enabled. The code for the mapping is given below:-

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 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_2_5.xsd">
  <context-param>
    <param-name>com.sun.faces.verifyObjects</param-name>
    <param-value>false</param-value>
  </context-param>
  <context-param>
    <param-name>com.sun.faces.validateXml</param-name>
    <param-value>true</param-value>
  </context-param>
  <context-param>
    <param-name>javax.faces.STATE_SAVING_METHOD</param-name>
    <param-value>client</param-value>
  </context-param>
<servlet>
  <servlet-name>Faces Servlet</servlet-name>
  <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
  <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
   <servlet-name>Faces Servlet</servlet-name>
   <url-pattern>/faces/*</url-pattern>
</servlet-mapping>
<session-config>
  <session-timeout>30</session-timeout>
</session-config>
<welcome-file-list>
   <welcome-file>faces/welcomeJSF.jsp</welcome-file>
</welcome-file-list>
</web-app>