template for web.xml Servlet3.0

  
<?xml version="1.0" encoding="UTF-8"?>

<web-app
          
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-app_3_0.xsd">

</web-app>