Issue at login page using cookies

Hello all
I have some issue with my first cookies-jsp.
Basically i have a homepage and i would like it to prompt a login form in case no cookies are found, and display the userName in case a cookie is found(and stored the name)
In case the user have to log in, the data entered in the form are sent to a "Register" servlet.
I will paste both the jsp and the servlet code, in the bottom i will explain then the problem
The jsp
<body>
        <h1 align="center" style="font-style:italic; color:olive">Welcome</h1>
        <%
        Cookie[] cookies=request.getCookies();
         if(cookies==null || cookies.length==1){
        %>
        <form action="Register" method="post">
        <table cellspacing="5" border="0" align="center">
           <tr>
               <td align="right">Name:</td><td align="right"><input type="text" name="name"></td>
           </tr>
           <tr>
               <td align="right">Email:</td><td align="right"><input type="text" name="email"></td>
           </tr>
           <tr>
               <td align="right">Submit</td><td align="right"><input type="submit" value="submit"></td>
           </tr>
        </table>
        </form>
        <%
          else {
         String cookieName="userName";
         String cookieValue="";
          for(int i=0; i<cookies.length; i++){
              Cookie cookie=cookies;
if(cookieName.equals(cookie.getName())){
cookieValue=cookie.getValue();
%>
<h3 align="center" style="font-style: italic; color:#6666FF">Welcome back <%=cookieValue%></h3>
<%
%>
</body>
The servlet (the relevant part, the doPost() method):protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//get the user details
String name=request.getParameter("name");
String email=request.getParameter("email");
//create the cookie and add to response
Cookie userName=new Cookie("userName",name);
userName.setPath("/");
userName.setMaxAge(60*60*24);
response.addCookie(userName);
//prepare for forwarding
String url="/home.jsp";
RequestDispatcher dispatcher=this.getServletContext().getRequestDispatcher(url);
dispatcher.forward(request,response);
The problem is that when i enter the userdetails the first time in the form (because no cookies was found), the login page with the form is redisplayed, and if i click on refresh or reclick on th submit button then the message with the name is displayed.
I dont understand this behaviour, since the amount of cookies after the first login is made will be "2", the homepage with the username should be redisplayed and not the one with the login form.
Any advice?
p.s:
the if(cookies==null || cookies.length==1){ its to prevent that the jsp will consider the JSESSIONID as "logged in" cookie
Edited by: enrico on Jan 23, 2011 10:36 PM

Turn off the cache in your browser or set an expire header in your servlet.
Also, you might want to consider using the servlet session instead of manipulating the cookie directly.

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