Http method post not supported by this url

I wrote this html file
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Login</title>
</head>

<body>
<h1>Login</h1>

Please enter your username and password
<form action="/Ch05/Login" method="POST">
<p><input type="text" name="username" length="40">
<p><input type="password" name="password" length="40">
<p><input type="submit" value="Submit" >
</form>
</body>
</html>

and the java class which it calls is
package web;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class Login extends HttpServlet {
public void dopost(HttpServletRequest request, HttpServletResponse response)
{ String username = request.getParameter("username");
try {
response.setContentType("text/html");
PrintWriter writer = response.getWriter();
writer.println("<html><body>");
writer.println("Thank You, "+ username + ". You are now logged into the system.");
writer.println("</body></html>");
writer.close();
}catch (Exception e) {
e.printStackTrace();
}
}
}
but when I am deploying it it giving the error as

"HTTP method POST is not supported by this URL" can somebody explain this?

dopost should be doPost

Ok...So do i need to redeploy after changing that/

I hope that you have already got the answer of your last question. Just to clarify u need to redeploy your application if you make ANY change in ur classes. This is not the case with jsp files or html files.

hth

try this inside the servlet mapping tags just insert the POST parameter as shown below. It worked for me!