HelloWorldServlet.java

package com.sap.hana.cloud.samples.weatherapp.web;

import java.io.IOException;

import javax.security.auth.login.LoginContext;
import javax.security.auth.login.LoginException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.sap.security.auth.login.LoginContextFactory;

/**
 * Servlet implementation class HelloWorldServlet
 */
public class HelloWorldServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public HelloWorldServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
    {
        String user = request.getRemoteUser();
        
        if (user != null)
        {
            response.getWriter().println("Hello, " + user);
        }
        else
        {
            LoginContext loginContext;
            
    	   try 
            {
                loginContext =  LoginContextFactory.createLoginContext("FORM");
    		    loginContext.login();
                response.getWriter().println("Hello, " + request.getRemoteUser());
            } 
            catch (LoginException ex) 
            {
                 ex.printStackTrace();
    	   }
        }
    }

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {	
        doGet(request, response);
    }
}