Enviando Mensagem Instatânea (MSN) com JAVA

Depois de sofrer bastante para fazer meu programa funcionar, finalmente consegui! E é realmente simples mandar uma mensagem para o MSN de alguém usando Java...

Primeiro, baixe a lib Java MSN Messenger Library (JML) em http://jml.blathersource.org/

Você precisará criar 2 classes.
Primeiro, crie a classe MSNListener, desse jeito:

import net.sf.jml.MsnContact;
import net.sf.jml.MsnMessenger;
import net.sf.jml.MsnSwitchboard;
import net.sf.jml.event.MsnAdapter;
import net.sf.jml.message.MsnControlMessage;
import net.sf.jml.message.MsnDatacastMessage;
import net.sf.jml.message.MsnInstantMessage;
import net.sf.jml.message.MsnSystemMessage;
import net.sf.jml.message.MsnUnknownMessage;

public class MsnListener extends MsnAdapter {

    public void exceptionCaught(
            MsnMessenger messenger,
            Throwable throwable) {
    }

    public void loginCompleted(
            MsnMessenger messenger) {
    }

    public void logout(
            MsnMessenger messenger) {
    }

    public void instantMessageReceived(
            MsnSwitchboard switchboard,
            MsnInstantMessage message,
            MsnContact friend) {
        switchboard.sendMessage(message, false);
    }

    public void systemMessageReceived(
            MsnMessenger messenger,
            MsnSystemMessage message) {
    }

    public void controlMessageReceived(
            MsnSwitchboard switchboard,
            MsnControlMessage message,
            MsnContact contact) {
        switchboard.sendMessage(message, false);
    }

    public void datacastMessageReceived(
            MsnSwitchboard switchboard,
            MsnDatacastMessage message,
            MsnContact friend) {
        switchboard.sendMessage(message, false);
    }

    public void unknownMessageReceived(
            MsnSwitchboard switchboard,
            MsnUnknownMessage message,
            MsnContact friend) {
    }

    public void contactListInitCompleted(
            MsnMessenger messenger) {
    }

    public void contactListSyncCompleted(
            MsnMessenger messenger) {
    }

    public void contactStatusChanged(
            MsnMessenger messenger,
            MsnContact friend) {
    }

    public void ownerStatusChanged(
            MsnMessenger messenger) {
    }

    public void contactAddedMe(
            MsnMessenger messenger,
            MsnContact friend) {
    }

    public void contactRemovedMe(
            MsnMessenger messenger,
            MsnContact friend) {
    }

    public void switchboardClosed(
            MsnSwitchboard switchboard) {
    }

    public void switchboardStarted(
            MsnSwitchboard switchboard) {
    }

    public void contactJoinSwitchboard(
            MsnSwitchboard switchboard,
            MsnContact friend) {
    }

    public void contactLeaveSwitchboard(
            MsnSwitchboard switchboard,
            MsnContact friend) {
    }

}

Agora, crie a classe MSNSender, desse jeito:

import java.util.Properties;
import net.sf.jml.Email;
import net.sf.jml.MsnMessenger;
import net.sf.jml.MsnProtocol;
import net.sf.jml.MsnUserStatus;
import net.sf.jml.impl.MsnMessengerFactory;

public class MSNSender {

    private String username;
    private String password;
    private String proxyHost;
    private String proxyPort;

    public MSNSender(
            String username,
            String password,
            String proxyHost,
            String proxyPort) {

        this.username = username;
        this.password = password;
        this.proxyHost = proxyHost;
        this.proxyPort = proxyPort;

    }

    public void send(
            String msg,
            String to) {

        if (proxyHost != null && proxyHost.trim().length() > 0) {
            Properties systemSettings = System.getProperties();
            systemSettings.put("https.proxySet", "true");
            systemSettings.put("https.proxyHost", proxyHost);
            systemSettings.put("https.proxyPort", proxyPort);
            systemSettings.put("http.proxySet", "true");
            systemSettings.put("http.proxyHost", proxyHost);
            systemSettings.put("http.proxyPort", proxyPort);
        }
        
        MsnMessenger messenger = MsnMessengerFactory.createMsnMessenger(username, password);
        messenger.setSupportedProtocol(new MsnProtocol[] { MsnProtocol.MSNP11 });
        messenger.getOwner().setInitStatus(MsnUserStatus.ONLINE);
        messenger.setLogIncoming(false);
        messenger.setLogOutgoing(true);
        messenger.addListener(new MsnListener());
        messenger.login();

        // Tempo de espera para completar o login
        try {
            Thread.sleep(16000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        messenger.sendText(Email.parseStr(to), msg);
        messenger.logout();
    }

    public static void main(String args[]){
        MSNSender sender = new MSNSender("rafael@hotmail.com","senha","","");
        sender.send("Oi! Tudo bem?", "maria@hotmail.com");
    }
}