How do I set the maximum age of a cookie?

package org.kodejava.servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet(name = "CookieExpirationServlet", urlPatterns = "/cookie-expiration")
public class CookieExpirationServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doPost(request, response);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String username = request.getParameter("username");
        if (username != null) {
            Cookie cookie = new Cookie("username", username);

            // Set the cookie age to 600 seconds (10 minutes). Setting the age
            // to 0 will delete the cookie while giving it a negative value will
            // not store the cookie, and it will be deleted when the browser is
            // closed.
            cookie.setMaxAge(600);
            response.addCookie(cookie);
        }
    }
}

Maven dependencies

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>4.0.1</version>
</dependency>