I want to load the property file when tomcat is starting.so I'm using servletContextListener to do that and i can get values of property file to my web application. But i want to keep the same value after changing the property file once log into web application.But when i change the value of property file and log into system again it change the value to new one.I want to keep the same value that loaded when tomcat was starting.how can i implement this?

My coding is as below

import javax.servlet.*;
import java.io.IOException;
import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.io.*;
import java.util.ResourceBundle;


public final class sysProperties  implements javax.servlet.ServletContextListener {   
   private static Properties props = new Properties();
   private static String file_name = "com/util/contact.properties";

   public addSystemProperties() {
   }

   public void contextInitialized(ServletContextEvent servletContextEvent) {

        // Get the context
        ServletContext servletContext = servletContextEvent.getServletContext();

        // Set a context attribute
        try {
            // props.load(servletContext.getResourceAsStream(file_name));
            props.load(getClass().getClassLoader().getResourceAsStream(file_name));

            System.out.println(" Application X is starting");

            servletContext.setAttribute("h1",props.getProperty("home.h1"));
            servletContext.setAttribute("h2",props.getProperty("home.h2"));

            System.out.println("h1"+servletContext.getAttribute("h1"));
            System.out.println("h2"+ servletContext.getAttribute("h2"));
            ;

        } catch (Exception e) {
            System.out.println(" Error setting context attribute: " + e.getMessage());
        }
    }

   public void contextDestroyed(ServletContextEvent servletContextEvent) {

        // Get the context
        ServletContext servletContext = servletContextEvent.getServletContext();

        // Output the context variable we set earlier
        System.out.println(" Application X is shutting down");
        System.out.println(" Value of h1 is: " + servletContext.getAttribute("h1"));
        System.out.println(" Value of h2 is: " + servletContext.getAttribute("h2"));

        // Clean up (not really necessary as the context is being destroyed, but let's be neat)
        servletContext.removeAttribute(props.getProperty("h1"));
        servletContext.removeAttribute(props.getProperty("h2"));   
    }
}