});
}
});
MessageDeliveryReceiptsManager messageDeliveryReceiptsManager = xmppSession.getExtensionManager(MessageDeliveryReceiptsManager.class);
messageDeliveryReceiptsManager.addMessageDeliveredListener(new MessageDeliveredListener() {
@Override
public void messageDelivered(MessageDeliveredEvent e) {
System.out.println("Message delivered: " + e.getMessageId());
}
});