Using ajax/servlets, different behaviour with different systems

I have written a small web application using servlets and ajax. I used the tomcat bundled with netbeans for deploying it. In the front end I create a timer which keeps running. I also have a form containing a paragraph that displays a question, followed by radio buttons and two buttons - a next and a submit. When I click the next button, I call a javascript function that creates an xmlHttp Object and sends the request for the next question and options from the servlet. when I request I also pass what the user has selected for the current question. when the timer reaches twelve or the user has finished attending all questions, the function would request for score through another xmlHttp Object. This program works fine in my computer. I also installed another tomcat server and ran it on another port and tested it. It works fine. But when I ran it college, the page was not displayed properly. When I click an option the contents of the form moves and only when I click the Next button twice, the corresponding javascript function is called.
I am pasting the html file and the servlet. What could be the reason?
This is qns.html
<html>
<head>
    <title></title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
//styles
    <script type ="text/javascript">
        
</script>
</head>
<body onload="load()">
    <div class="top">
     <h1>Welcome to Online Quiz</h1>
    </div>
    <div class="main" id="container">
        <form name ="uform" action="javascript:ajaxFunction(1)">
        <table cellpadding ="5" cellspacing ="20">
            <thead></thead>
            <tbody>
                <tr>
                    <td></td>
                    <td></td>
                    <td></td>
                    <td align="right">
                        <p style="text-align:right" id="clock">Time: 0:<span id="min">0</span>:<span id ="snds">0</span></p>
                    </td>
                </tr>
                <tr>
                    <td colspan="4">
                        <p id="question"></p>
                    </td>
                </tr>
                <tr>
                    <td>
                        <input type="radio" name ="choice"><span id="choicea"></span>
                    </td>
                    <td>
                        <input type="radio" name ="choice"><span id="choiceb"></span>
                    </td>
                    <td>
                        <input type ="radio" name ="choice"><span id="choicec"></span>
                    </td>
                    <td>
                        <input type ="radio" name="choice"><span id="choiced"></span>
                    </td>
                </tr>
                <tr>
                    <td colspan="2">
                        <input type ="button" value ="Next" name ="nxt" onclick="ajaxFunction(0)">
                    </td>
                    <td colspan="2">
                        <input type = "submit" value ="Finish">
                    </td>
                </tr>
            </tbody>
        </table>
    </form>
    </div>
</body>
</html>
import java.io.*;
import java.net.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
import java.lang.*;
* @author arun
public class test extends HttpServlet {
    * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
    * @param request servlet request
    * @param response servlet response
        Connection con;
        int marks = 0;
        StringBuffer qn;
        int qno;
        String prevAns = "wow";
        String choice = new String();
        //To be updated based upon the number of questions!!
        int no_of_qns = 2;
    public void init(ServletConfig config) throws ServletException {
        try {
            Class.forName("org.gjt.mm.mysql.Driver");
            con = DriverManager.getConnection("jdbc:mysql://localhost:3306/mysql", "root", "");
            Statement qry;
            qry = con.createStatement();
            qry.executeQuery("use login;");
        } catch (Exception io) {
            System.out.println(io);
            System.exit(0);
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        qn = new StringBuffer();
        try {
            Statement qry;
            qry = con.createStatement();
            qno = Integer.parseInt(request.getParameter("qno"));
            choice = request.getParameter("ans");
            if(prevAns.equalsIgnoreCase(choice)){
                  marks++;
            if(qno == (no_of_qns +1)){
                out.println(marks);
                marks = 0;
            String qryString = "select * from questions where questionno="+qno+";";
            ResultSet rs = qry.executeQuery(qryString);
            while(rs.next()){
                qn.append(rs.getString(1));
                qn.append(") "+rs.getString(2));
                qn.append("|"+rs.getString(3));
                qn.append("|"+rs.getString(4));
                qn.append("|"+rs.getString(5));
                qn.append("|"+rs.getString(6));
                prevAns =rs.getString(7);
            out.println(qn.toString());
        catch(SQLException io){
            System.out.println(io);
        finally {
            out.close();
    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    * Handles the HTTP <code>GET</code> method.
    * @param request servlet request
    * @param response servlet response
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    * Handles the HTTP <code>POST</code> method.
    * @param request servlet request
    * @param response servlet response
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    * Returns a short description of the servlet.
    public String getServletInfo() {
        return "Short description";
    // </editor-fold>
}What might be the problem?
Edited by: carunkumar on Oct 4, 2008 8:21 AM

carunkumar wrote:
function ajaxFunction(chz)
jsnds = document.getElementById('snds');
jmin = document.getElementById('min');
var back;
var ans = 'arunkumar c';
try
var xmlHttp=new XMLHttpRequest();
catch (io)
alert("Your might be using IE or your browser does not support AJAX!.");
return false;
}First thing is that the Ajax request you are building is not browser specific.
Go to this site it will give you the specific code www.tizag.com/ajaxTutorial/
And do try and test your program on diff browser from your pc only. Its a ajax world so be careful while dealing with browsers
and there settings. Just check your browser setting on your pc and check the same setting at your college also.
Buddy this ajax give a trick in big presentation also :) So no need to worry and test it and do it, its real fun when you just
cross this browser secific dependencies.
Cheers
Sachin Kokcha

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> will that be a "good practice" or an architectural design flop?
>
it is a good practise to use ccBPM in this case and it is offering correlation mechanism to maintain the reaction between messages so that you can easily differentiate and suppress the unwanted messages.
Regards,
Raj

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