'The requested resource is not available' error

Hi all,

I have gone through many topics about this error, but i am not able to arrive at a solution to my problem.

I have a JSP named 'Login.jsp' placed inside a folder called 'LoginPages'. On clicking submit button, it goes to a servlet page named 'LoginController.java' and checks for correct login. If username and pwd matches it goes to the home page, else returns back to the login page itself.

When the username and pwd does not match, it correctly returns back to the login page itself. My problem is, when the username and pwd matches, it gives out this error:

The requested resource (/LoginController) is not available.

But at the first attempt when my username and pwd matches, it works correctly. Only after a wrong entry(uname and pwd not match) it gives out this error. Can anyone tell me why?

My code is as below:

Login.jsp

<%@ page contentType="text/html; charset=utf-8" language="java" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <title>User Login</title>
        
    </head>

<body>
        <form id="form1" name="form1" method="post" action="../LoginController">
           
                <table>
                    <tr>
                        <td>User name</td>
                        <td >
                            
                                <input type="text" name="username" id="username" />
                                </td>
                    </tr>
                    <tr>
                        <td>Password</td>
                        <td>
                            <input type="password" name="password" id="password" />    </td>
                    </tr>
                    <tr>
                        <td colspan="2">
                            
                                <input type="submit" name="submit" id="submit" value="Login" />

</td>
                    </tr>
                    <tr>
                        <%
                                    String val = (String) request.getAttribute("lfail");
                                    if (val != null) {
                        %>
                        <td colspan="2"><%=val%></td>
                        <%
                                    }
                        %>
                    </tr>
                </table>
            </div>
        </form>
    </body>
</html>

LoginController.java

package servlets;

import beanclasses.login;
import DAO.loginDB;
import java.util.*;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class LoginController extends HttpServlet {

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String name = request.getParameter("username");
        String password = request.getParameter("password");
        
        if((name.equals("raja"))&&(password.equals("raja")))
       {
 
            response.sendRedirect("LoginPages/UserHomePage.jsp");
        } else {
            request.setAttribute("lfail", "Login Failed Try Again");
            RequestDispatcher rd = request.getRequestDispatcher("LoginPages/Login.jsp");
            rd.forward(request, response);
        }
    }

@Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

@Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }
}

can you show us your web.xml?

vysh srini wrote:<form id="form1" name="form1" method="post" action="../LoginController">

It is using relative path.

Relative paths change depending upon what page the links are located on.
Try to use absolute path 'like' below

I used

But no use, I am getting the same error. I also tried using 'application.getRealPath(servlets\LoginController.java)'. It returns the absolute path. But i need to give only the 'url-pattern' (which is in web.xml) in the 'action' tag(if i am not wrong). So it is also not working. Please help me...

My web.xml is as follows:

you browser might clearly telling you which resource is not available with him
you have not posted that name like
The requested resource(LoginPages/UserHomePage.jsp) is not available
so
1. provide the requested resource
or
2. request the available resource

I have already mentioned the error. the error which I am getting is:

The requested resource (/LoginController) is not available.

The resource is present in my project. no doubt about it.....

Wich folder is the "/LoginController" ? Could you give us the full path?

The "/LoginController" is present in the following location in my project

D:\Netbean Projects\Example\src\java\servlets\LoginController.java

What is the return of "request.getContextPath()" ?

The return of

request.getContextPath();

is

/Example

vysh srini wrote:The "/LoginController" is present in the following location in my project

D:\Netbean Projects\Example\src\java\servlets\LoginController.java

The location of the java file is completely irrelevant.

I believe thats the problem.

The method is returning /Example when you concat with your Action you will get: "/Example/LoginController" and thats not where your Controller it is.

D:\Netbean Projects\Example\src\java\servlets\LoginController.java

Hebert Coelho wrote: you will get: "/Example/LoginController" and thats not where your Controller it is.

According to the URL mapping that is exactly where the controller "is".

Where the physical class file is located is moot as far as the URL is concerned. All that matters is the mapping.

P.S. Are you really using back-slashes in the URL?

Bear Bibeault wrote:P.S. Are you really using back-slashes in the URL?

I belive hes error is here:

Even here the mapping is not correct.

Hebert Coelho wrote:I belive hes error is here:
<servlet-class>servlets.LoginController</servlet-class>

Random guessing isn't going to do any good. There's nothing wrong with that declaration.

Even here the mapping is not correct.

It's not a mapping; it's the class name.

Bear Bibeault wrote:

Hebert Coelho wrote:I belive hes error is here:
<servlet-class>servlets.LoginController</servlet-class>

Random guessing isn't going to do any good. There's nothing wrong with that declaration.

Even here the mapping is not correct.

It's not a mapping; it's the class name.

Up there he said he class was at:
D:\Netbean Projects\Example\src\java\servlets\LoginController.java
And he mapped at
Thats why i said that, I think hes package should be:

That does not match the package statement in his source file. But until he let's us know where he put the class file...

Hebert Coelho wrote:I believe thats the problem.

The method is returning /Example when you concat with your Action you will get: "/Example/LoginController" and thats not where your Controller it is.

D:\Netbean Projects\Example\src\java\servlets\LoginController.java

I have already told that I have used getContextPath() like this:

<form id="form1" name="form1" method="post" action="<%=request.getContextPath()%>\servlets\LoginController.java">

Thats why i said that, I think hes package should be:

java.servlets.LoginController

I use Netbeans IDE. When I open my project through window explorer, the structure of my project will consists of folders like
build, dist, src, web etc.... Inside my 'web' folder, I will be having my jsp pages. Inside my 'src' folder, i will having all my java codings inside the folder 'src\java'. Since i wanted to give the full path, i gave the full path by right cliking my file and looking into its properties .So the 'java' is not the package name, it is the folder name. So my servlet class

is correct(as it should not include the folder 'java')

I believe that a proper mapping of Java resource in the web.xml should resolve your issue.

Few days before there was another discussion thread on somewhat a similar issue. Just have a look at this:

http://www.coderanch.com/t/505924/Servlets/java/Status

This problem still seems to be there

. Can anyone help me

Atlast the error is resolved!!! The error was with the usage of RequestDispatcher.forward() method. When we use this method, the contents of the page only gets changed but the url still shows the forwarding page, i.e., if i am in page1.jsp and forwarding to page2.jsp, the contents will show page2.jsp but the url will still show page1.jsp only.

So in my case, the url was still showing the 'LoginController' page, from there when i again try to go to 'LoginController' itself, it shows me an error.

I used response.sendRedirect() instead.

vysh srini wrote:The error was with the usage of RequestDispatcher.forward() method. When we use this method, the contents of the page only gets changed but the url still shows the forwarding page, i.e., if i am in page1.jsp and forwarding to page2.jsp, the contents will show page2.jsp but the url will still show page1.jsp only.

That's where absolute path comes in picture. If we use absolute path, url will work regardless of current path. This is what I have suggested in my previous post.
Anyhow you got it working