Question

How to solve the problem with the following error

Asked by: Ananthakrishnan_K

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

<--------index.jsp--------->
 
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form action="validateuser.jsp" method="POST">
username - <input type="text" name="userName">
password - <input type="password" name="passWord">
<input type="submit" value="Submit">
<input type="reset" value="Reset">
</form>
</body>
</html>
 
<----------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" %>
<jsp:useBean id="idHandler" class="com.mycompany.login.Login" scope="request">
<jsp:setProperty name="idHandler" property="*"/>
</jsp:useBean>
    
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head></head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<body>
<%
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");
}
%>
</body>
</html>
 
<-----------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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Asked On
2009-09-30 at 05:23:00ID24773273
Tags

eclipse

,

mysql

,

java

,

jsp

Topics

Eclipse

,

MySQL Server

,

WebApplications

Participating Experts
2
Points
125
Comments
5

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Answers

 

by: kadabaPosted on 2009-09-30 at 05:33:54ID: 25457972


try changing method="POST" to method="GET".

You are trying to access the user name and the password from the request, which seems to be not there, hence you are getting a null pointer while comparing,

will have a look at the complete code a lil later.

 

by: Bart_CrPosted on 2009-09-30 at 05:47:08ID: 25458140

Change the bottom lines in Login.java to the code below. It seems there's no user or no pass passed in and there's no null check for either
  

return (Username != null && Password != null && Username.equals(user) && Password.equals(pass));

                                              
1:

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by: kadabaPosted on 2009-09-30 at 07:33:29ID: 25459280

ignore my earlier POST to GET point! I dint see user name / password :)

the user name and password is as below in the first page as below

username - <input type="text" name="userName">
password - <input type="password" name="passWord">

In the second page you have

String userName = request.getParameter("USER_NAME");
String passWord = request.getParameter("PASSWORD");

now USER_NAME should be in the request for you to access and so is the same case with PASSWORD. Where are you setting it in the request? Hence your userName and passWord will be null.

You should access it in this way

String userName = request.getParameter("userName");
String passWord = request.getParameter("passWord");

or it should be present in the URL as USER_NAME = xxx and PASSWORD =yyy in the URL(Which is not at all advised in this case!)

Hence the exception.

I hope I am right on this.









 

by: kadabaPosted on 2009-10-01 at 14:41:19ID: 25473465

jsp:useBean : this will be used for the form bean , no import of your class Login

 

by: Ananthakrishnan_KPosted on 2009-10-19 at 08:30:13ID: 25606092

okay

20120131-EE-VQP-002

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