How to create simple Hello World Servlet application in Java ?

Program to demonstrate working of a simple Hello World servlet

package com.hubberspot.servlet.example;

import java.io.*; 
import javax.servlet.*;
import javax.servlet.http.*;

public class HelloWorld extends HttpServlet 
{
  public void doGet(HttpServletRequest request, 
          HttpServletResponse response) 
          throws ServletException, IOException 
{
    response.setContentType("text/html");
    PrintWriter out = response.getWriter();
    out.println("

Hello World

"); 
  }
}

Output of the program on the web browser :