Below is my Servlet and jsp code. I am trying to login with username "admin" and password "pass", but I am getting a NullPointerException. Below is also the error which I receive when using a browser to log in.
Servlet Code:
package org.fproject;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebInitParam;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class AdminLogin
*/
@WebServlet(value="/AdminLogin",initParams={@WebInitParam (name="user", value="admin"),
@WebInitParam(name="pass",value="pass")})
public class AdminLogin extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public AdminLogin() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
public void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
// TODO Auto-generated method stub
String iuser=getInitParameter("user");
String ipass=getInitParameter("pass");
String user=req.getParameter("user");
String pass=req.getParameter("pass");
res.setContentType("text/html");
PrintWriter out=res.getWriter();
out.println("<html><body>");
if(user.equals("admin") && pass.equals("pass")){
out.println("<b>Welcome<b>");
}
else{
out.println("<b>Invalid Login<b>");
}
out.println("</body></html>");
out.close();
}
}
JSP Code
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ page import="org.fproject.*"%>
<!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="AdminLogin" method="post">
<table border="0">
<tr>
<td>Username<td>
<td><input type="text" name="user" size="50"/></td>
</tr>
<tr>
<td>Password<td>
<td><input type="password" name="password" size="50"/></td>
</tr>
<tr>
<td><input type= "submit" value="SUBMIT"/></td>
</tr>
</table>
</form>
</body>
</html>
Error:-
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
java.lang.NullPointerException org.fproject.AdminLogin.doPost(AdminLogin.java:48) javax.servlet.http.HttpServlet.service(HttpServlet.java:754) javax.servlet.http.HttpServlet.service(HttpServlet.java:847) note The full stack trace of the root cause is available in the JBoss Web/7.0.13.Final logs.
JBoss Web/7.0.13.Final
