Java XMPP spam bot

import java.util.Date;

import org.jivesoftware.smack.Connection;
import org.jivesoftware.smack.Roster;
import org.jivesoftware.smack.XMPPConnection;
import org.jivesoftware.smack.XMPPException;
import org.jivesoftware.smack.packet.Message;
import org.jivesoftware.smack.packet.Presence;
import org.jivesoftware.smackx.packet.Nick;
import org.jivesoftware.smackx.packet.VCard;

public class Nespi {
    private final static String SERVER = "jabber.cz";
    private final static String JMENO = "login";
    private final static String HESLO = "heslo";
    private final static String NICK = "Nespi!";
    private final static int STATUS_UPDATE_INTERVAL = 60; // [s]

    public static boolean aktualizovat = true;

    private static Connection con;
    private static Presence pr;

    public static void main(String[] args) throws XMPPException,
            InterruptedException {

        con = new XMPPConnection(SERVER);
        con.connect();
        con.login(JMENO, HESLO);

        Roster.setDefaultSubscriptionMode(Roster.SubscriptionMode.accept_all);

        pr = new Presence(Presence.Type.available);
        pr.setStatus(";-)");
        con.sendPacket(pr);

        new Nick(NICK);
        VCard vCard = new VCard();
        vCard.setJabberId(JMENO + "@" + SERVER);
        vCard.setNickName(NICK);
        vCard.save(con);

        class Status implements Runnable {
            @Override
            public void run() {
                while (aktualizovat) {
                    posliZpravu("JABBER_ID", "Nespi!");
                    try {
                        Thread.sleep(STATUS_UPDATE_INTERVAL*1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }

        Status st = new Status();
        Thread vlakno = new Thread(st);
        vlakno.start();
        System.out.println("XMPP klient byl uspesne spusten.");
        vlakno.join();
        con.disconnect();

    }

    public static void posliZpravu(String komuJID, String textZpravy) {
        Message zprava = new Message();
        zprava.setTo(komuJID);
        zprava.setBody(textZpravy);
        zprava.setType(Message.Type.chat);
        con.sendPacket(zprava);

        System.out.println("Zprava odeslana: " + new Date().toString());
    }

}