Sono alle prime armi con la gestione dei cookies e ho provato a copiare da un libro questo semplice codice:

codice:
package coreservlets;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

/** Sets six cookies: three that apply only to the current
* session (regardless of how long that session lasts)
* and three that persist for an hour (regardless of
* whether the browser is restarted).
*/

public class SetCookies extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	for(int i=0; i<3; i++) {

	    // Default maxAge is -1, indicating cookie
	    // applies only to current browsing session.
	    Cookie cookie = new Cookie("Session-Cookie " + i, "Cookie-Value-S" + i);
	    response.addCookie(cookie);
	    cookie = new Cookie("Persistent-Cookie " + i, "Cookie-Value-P" + i);

	    // Cookie is valid for an hour, regardless of whether
	    // user quits browser, reboots computer, or whatever.
	    cookie.setMaxAge(3600);
	    response.addCookie(cookie);
	}
	response.setContentType("text/html");
	PrintWriter out = response.getWriter();
	String title = "Setting Cookies";
	out.println(ServletUtilities.headWithTitle(title) +
		"<BODY BGCOLOR=\"#FDF5E6\">\n" +
		"<H1 ALIGN=\"CENTER\">" + title + "</H1>\n" +
		"There are six cookies associated with this page.\n" +
		"To see them, visit the\n" +
		"<A HREF=\"/servlet/coreservlets.ShowCookies\">\n" +
		"<CODE>ShowCookies</CODE> servlet</A>.\n" +
		"

\n" +
		"Three of the cookies are associated only with the\n" +
		"current session, while three are persistent.\n" +
		"Quit the browser, restart, and return to the\n" +
		"<CODE>ShowCookies</CODE> servlet to verify that\n" +
		"the three long-lived ones persist across sessions.\n" +
		"</BODY></HTML>");
    }
}
Il problema, è che mi dà il seguente errore, quando cerco di aprire la servlet da browser:

codice:
type Exception report

message 

description The server encountered an internal error () that prevented it from fulfilling this request.

exception 

java.lang.IllegalArgumentException: Cookie name "Session-Cookie 0" is a reserved token
	javax.servlet.http.Cookie.<init>(Cookie.java:140)
	coreservlets.SetCookies.doGet(SetCookies.java:19)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	org.apache.catalina.servlets.InvokerServlet.serveRequest(InvokerServlet.java:419)
	org.apache.catalina.servlets.InvokerServlet.doGet(InvokerServlet.java:133)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)


note The full stack trace of the root cause is available in the Apache Tomcat/5.5.15 logs.
Help plz!