How to use Mojarra or how to solver the error "java.lang.ClassNotFoundException: javax.faces.webapp.FacesServlet"

How to user Mojarra:

  
   com.sun.faces
   jsf-api
   2.1.2
  
  
        com.sun.faces
        jsf-impl
        2.1.2
      

References http://josebobsantos.wordpress.com/2011/09/12/basic-jsf-2-0-maven-configuration-with-eclipse-and-tomcat-7-0/