Question : How to solve the problem with the following error

Hi
I got a problem with code which I attached below. Am getting a error like:
type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: An exception occurred processing JSP page /validateuser.jsp at line 18

15: <%
16: String userName = request.getParameter("USER_NAME");
17: String passWord = request.getParameter("PASSWORD");
18: if (idHandler.authenticate(userName, passWord)){
19: System.out.println("login is successfull");
20: //} else {
21: //response.sendRedirect("retry.jsp");

Stacktrace:
      org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:505)
      org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:416)
      org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
      org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

root cause

java.lang.NullPointerException
      com.mycompany.login.Login.authenticate(Login.java:42)
      org.apache.jsp.validateuser_jsp._jspService(validateuser_jsp.java:83)
      org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
      org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
      org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
      org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
      javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

Please help me out.
Thanking you

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<--------index.jsp--------->
 
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>




Insert title here



username - 
password - 





 
<----------validateuser.jsp--------->
 
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<%@page import="java.util.*" %>
<%@page import="java.util.HashMap" %>
<%@page import="java.util.Collections" %>



    





<%
String userName = request.getParameter("USER_NAME");
String passWord = request.getParameter("PASSWORD");
if (idHandler.authenticate(userName, passWord)){
System.out.println("login is successfull");
//} else {
//response.sendRedirect("retry.jsp");
}
%>


 
<-----------Login.java--------->
package com.mycompany.login;
 
import java.sql.*;
import java.io.*;
 
public class Login {
	
 
	//default constructor
	public Login(){}
 
	//method for the catabase connection
	public Connection getConnection()
	throws IOException{
	Connection conn = null;
	try{
	Class.forName("com.mysql.jdbc.Driver");
	conn = DriverManager.getConnection(
	"jdbc:mysql:@localhost:3036:anantha",
	"root",
	"buser");
	}
	catch(SQLException e)
	{
	System.out.println("SQLException: " + e.getMessage());
	while((e = e.getNextException()) != null)
	System.out.println(e.getMessage());
	}
	catch(ClassNotFoundException e)
	{
	System.out.println("ClassNotFoundException: " + e.getMessage());
	}
	return conn;
	}
 
	//method that is called from validateuser.jsp and this checks for the authentic user and
	public boolean authenticate(String user, String pass)
	throws SQLException, IOException{
	String Username = null; 
	String Password = null;
	Login dbconn = new Login();
	Statement stmt = dbconn.getConnection().createStatement();
	String sql = "SELECT USER_NAME,PASSWORD FROM userlogin WHERE USER_NAME='" + user + "'" + "AND PASSWORD='" + pass + "'";
	ResultSet rs = stmt.executeQuery(sql);
	if(rs.next()){
	Username = rs.getString("USER_NAME");
	Password = rs.getString("PASSWORD");
	}
	if(Username != null && Password != null && user.equals(Username) && pass.equals(Password)){
	return true;
	}
	else return false;
	}
	}

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Question : How to solve the problem with the following error

Answer : How to solve the problem with the following error

okay