ServletContext is a interface which helps us to communicate with the servlet container. There is only one ServletContext for the entire web application and the components of the web application can share it.

The Mapping of the Context init parameters in web.xml as:

<servlet>
    <servlet-name>Mapping</servlet-name>
    <servlet-class>ContextMapping</servlet-class>
</servlet>

<context-param>
    <param-name>Email</param-name>
    <param-value>userEmail@gmail.com</param-value>
</context-param>

Again we access the Init parameter in the servlet using ServletContext :

ServletContext context = getServletContext();
pw.println(context.getInitParameter("Email");