title: Why does my Servlet create a JSESSIONID cookie?
body: <p>I am developing something using Servlets. I am creating cookies in this program, and a cookie named as <code>JSESSIONID</code> is being created, but when I comment out all the code even then the cookie is created. Here is my code:</p>
  
  <h2>CookieDemoServlet.java:</h2>
  
  <pre><code>public class CookieDemoServlet extends HttpServlet {
  
      public void service(HttpServletRequest req, HttpServletResponse res) throws
              ServletException, IOException {
  
          /*String em = req.getParameter("email");
          Cookie ck[] = req.getCookies();
          if (ck != null) {
              if (ck.length != 0) {
                  for (Cookie c : ck) {
                      String cn = c.getName();
  
                      if (cn.equals("JSESSIONID")) {
  
                          System.out.println("You are the Old User");
                          String cv = c.getValue();
                          String d = c.getDomain();
  
                          System.out.println(cn + "\t:" + cv + "\t:" + d);
                      }
  
                  } else {
                      System.out.println("Sorry,No Cookies Found");
                  }
              }
  
              HttpSession session = req.getSession();
              boolean b = session.isNew();
              if (b) {
                  System.out.println("You are the New user");
              } else {
                  System.out.println("You are the Old User");
              }
  
              Cookie c1 = new Cookie("Email", em);
              res.addCookie(c1);
              Cookie c2 = new Cookie("Phone", "99999");
              res.addCookie(c2);*/
  
              RequestDispatcher rd = req.getRequestDispatcher("cookiedemo.jsp");
              rd.forward(req, res);
  
          }
  
      }
  }
  </code></pre>
  
  <p>What could be the reason?</p>