java.lang.IllegalStateException: Cannot forward after response has been committed

Hi All
Kindly tell me where I am going wrong. I googled but the solutions given there are not applicable to this case. Because I have not written anything to server before forwarding the request. Can you please tell me where I am going wrong. The codes are given below.

//jsp code
<html>
<head>
<title>recoverPassword</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<script language="JavaScript" src="../scripts/recoverPswd.js">

</script>

<table  >
<th >Enter answer for your security question and e-mail id to recover password</th>
<tr>
<td>Select your security question.</td>
<td>
<select name="cmbSecurityQuest">
<option value="-1">--Choose a security question--</option>
<option value="What is your mother's maiden name">What is your mother's maiden name?</option>
<option value="What is your first school teacher name">What is your first school teacher name?</option>
<option value="What is your favourite colour">What is your favourite colour?</option>
<option value="What is the name of your best friend">What is the name of your best friend?</option>
<option value="What is the name of your manager at your first job">What is the name of your manager at your first job?</option>
<option value="Quest6">Write my own question...</option>
</select>
</td>
</tr>
<tr>
<td>Answer</td>
<td><input type="text" name="txtSecurityAns"/></td>
</tr>
<tr>
<td>E-mail Id</td>
<td><input type="text" name="txtRecoverEmail"/></td>
</tr>
<tr>
<td></td>
<td><input type="submit" name="btnForgotSubmit" value="Submit" onClick="return validateForm()"/> <input type="reset" name="btnForgotReset" value="Reset"/></td>
<td></td>
</tr>
</table>
</form>
</body>
</html>

//servlet code
package com.dee.bht.servlets;

import java.io.IOException;

import javax.servlet.*;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServlet;
import javax.servlet.RequestDispatcher;

import com.dee.bht.dao.UserDAO;
import com.dee.bht.dao.UserDAOImpl;
import com.dee.bht.domain.User;
public class RetrieveUserNamePasswdServlet extends HttpServlet{
	
	@Override
		protected void doPost(HttpServletRequest req, HttpServletResponse res)
			throws ServletException, IOException {
		// TODO Auto-generated method stub
		super.doPost(req, res);
		
		String securityQuestion = req.getParameter("cmbSecurityQuest");
		String answer = req.getParameter("txtSecurityAns");
		String emailId = req.getParameter("txtRecoverEmail");
		
		User user = new User();
		
		user.setSecurityQuestion(securityQuestion);
		user.setAnswer(answer);
		user.setEmailId(emailId);
		
		UserDAO userDAO = new UserDAOImpl();
		User us = userDAO.retrieveUserInfo(user);
		
		req.setAttribute("user", us);
		RequestDispatcher dispatcher = req.getRequestDispatcher("./jsp/userNamePassword.jsp");
		dispatcher.forward(req, res);
		return;
	}
}

//userDAOImpl code

One thing at a time. First remove:

super.doPost(req, res);

What did you think that was going to do for you?

Hey thanks Bear. Issue is solved.