Help me

HI I am using Tomcat6.0 this is the problem i got wen i run the code , i am using login.html ,login .jsp,login.java and web.xml code

java.lang.NullPointerException 
org.apache.jsp.loginjsp.jspInit(login_jsp.java:23) 
org.apache.jasper.runtime.HttpJspBase.init(HttpJspBase.java:52) 
org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:159) 
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:329) 
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)

// here is code login.jsp

<html>
<body bgcolor="white">
<h1> I have been invoked by <%
out.print(request.getAttribute("servletName").toString()); %></p>
<p></body>
</html></p>
<p>login.java</p>
<p>import java.io.IOException; import java.io.PrintWriter;</p>
<p>import javax.servlet.RequestDispatcher; import
javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;</p>

<p>public class Login1 extends javax.servlet.http.HttpServlet implements
javax.servlet.Servlet { static final long serialVersionUID = 1L;</p>
<p>protected void doGet(HttpServletRequest request, HttpServletResponse
response) throws ServletException, IOException { try{ 
response.setContentType("text/html"); PrintWriter out=response.getWriter();
String name=request.getParameter("name"); String 
pass=request.getParameter("password");</p>

if(name.equalsIgnoreCase("Snipe")&& pass.equals("snipe")){
        // getServletContext().getRequestDispatcher("/login.jsp").forward(request,response);
         response.sendRedirect("/Simple/jsp/login.jsp");
    }else{
        out.println("<html>");
        out.println("<body>");
        out.println("Invalid User name OR passowrds");
        out.println("</body>");
        out.println("</html>"); 
    }

}catch (Exception e) {
e.printStackTrace();
}


} }

// html file is:

<!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>User Login</title>
</head>
<body bgcolor="cream">
<form action="login" method="get">
Enter User name:
<input type="text" name="name"><br></p>
<p>Enter Password:
<input type="password" name="password"><br></p>
<p><input type="submit" name="submit" value="login"></p>
<p></body>
</html>

and web.xml code:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>ActivityManagementSystem</display-name>

<display-name>Activity Management System</display-name>
  <description>
     Welcome to Web Appllication
  </description> 
    <welcome-file-list>
    <welcome-file>html/Login.html</welcome-file>
    </welcome-file-list>

  <servlet>
    <servlet-name>ZmgrVal</servlet-name>
    <servlet-class>servletapplication.Login1</servlet-class>
  </servlet>

  <servlet-mapping>
    <servlet-name>ZmgrVal</servlet-name>
    <url-pattern>/login</url-pattern>
  </servlet-mapping> 

</web-app>

Does anyone have a clear resolution to this vexing issue? Thanks in advance.

View Answers

December 22, 2010 at 5:12 PM

Hello Friend,

Try this:

1)form.html:

<html>
<form method="post" action="http://localhost:8080/examples/jsp/login.jsp">
<table>
<tr><td>Name:</td><td><input type="text" name="name"></td></tr>
<tr><td>Address:</td><td><input type="password" name="password"></td></tr>
<tr><td></td><td><input type="submit" value="Submit"></td></tr>
</table>
</form>
</html>

2)login.jsp:

<%
   String name = request.getParameter( "name" );
    String pass = request.getParameter( "password" );
   request.setAttribute( "theName", name );
   request.setAttribute( "thePass", pass );
%>

<jsp:forward page="../Login1"/>

3)Login1.java:

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.*;
import javax.servlet.http.*;


public class Login1 extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet { static final long serialVersionUID = 1L;

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    try{
        response.setContentType("text/html");
        PrintWriter out=response.getWriter();
        String name=(String)request.getAttribute("theName");
        String pass=(String)request.getAttribute("thePass") ;
        System.out.println(name+" "+pass);
        if(name.equalsIgnoreCase("Snipe")&& pass.equals("snipe")){
             response.sendRedirect("/examples/jsp/form.html");
        }else{
            out.println("<html>");
            out.println("<body>");
            out.println("Invalid User name OR passwords");
            out.println("</body>");
            out.println("</html>"); 
        }
    }catch (Exception e) {
    e.printStackTrace();
    }
}
}

4)web.xml:

Put the following inside web-app tag:

<servlet>
        <servlet-name>Login1</servlet-name>
        <servlet-class>Login1</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>Login1</servlet-name>
        <url-pattern>/Login1</url-pattern>
    </servlet-mapping>

Thanks









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