hi ... there iz some problem in this code, i m not getting all the cookies ... can anybody point out my mistake

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class CookieDemo extends HttpServlet
{
    public void service(HttpServletRequest req,HttpServletResponse res) throws IOException,ServletException
    {
        String bookname;
        res.setContentType("text/html");
        PrintWriter p=res.getWriter();
        bookname=req.getParameter("bookname");
        if(bookname!=null && bookname.length()>0)
        {
            Cookie cookie=new Cookie("book",bookname);
            res.addCookie(cookie);
        }
        Cookie[] cookies=req.getCookies();
        if(cookies.length>0)
        {
            p.println("[list]");
            for(int i=0;i<cookies.length;i++)
            {
                bookname=cookies[i].getValue();
                p.println("<li>"+bookname+"</li>");
            }
            p.println("</ul>");
        }
        p.println("<form action='CookieDemo'>");
        p.println("Enter Book Name: <input type='text' name='bookname'>");
        p.println("<input type='submit' value='Add Book'>");
        p.println("</form>");
    }
}