Problem PacketListener

Smack Smack Dev
1

Hi Everyone!

I’‘m new user of Smack and I need your help for my school project that’'s to create a Instant Messaging Client.

I’'ve a problem with the method (XMPPConnexion).addPacketListener(PacketListener, Filter)

When I launch my program, I’'ve always an JavaNullPointerException but sending and receiving Message work…

Another problem is that I’'ve a lot of Message Body receive to null when I Chat on my program with a spark client ( when the spark user write a message on chat window and when I send a message with my client)

Ps : Sorry for the vocabulary but i’'m french and my english is not good

2

Could you post your code that is causing the null pointer exception.

3

My code is :

/b

import javax.swing.*;

import java.awt.*;

//import java.awt.event.*;

import org.jivesoftware.smack.*;

import org.jivesoftware.smack.packet.*;

import org.jivesoftware.smack.filter.*;

public class Fenetre extends JFrame implements PacketListener{

public XMPPConnection con;

public JPanel global, ecrire;

public JTextArea ecr, rec;

public JScrollPane scrollecr, scrollrec;

public JButton envoi;

public static Chat chat;

public PacketListener myListener;

public PacketFilter filter;

public Fenetre(){

this.setSize(400,200);

this.setDefaultCloseOperation(EXIT_ON_CLOSE);

this.global = new JPanel();

this.global.setLayout(new BorderLayout());

this.ecr = new JTextArea();

this.rec = new JTextArea();

this.rec.setEditable(false);

this.rec.setRows(7);

this.ecr.setRows(3);

this.ecr.setLineWrap(true);

this.rec.setLineWrap(true);

this.envoi = new JButton(“Envoyer”);

this.scrollecr = new JScrollPane(this.ecr);

this.scrollrec = new JScrollPane(this.rec);

this.ecrire = new JPanel();

this.ecrire.setLayout(new BorderLayout());

this.ecrire.add(scrollecr, BorderLayout.CENTER);

this.ecrire.add(envoi, BorderLayout.EAST);

this.global.add(scrollrec, BorderLayout.CENTER);

this.global.add(ecrire, BorderLayout.SOUTH);

this.add(global);

this.setTitle(“Conversation Window Test”);

this.setVisible(true);

boolean co = this.createConnexion();

if (co){

this.setTitle(“Connected”);

}

this.envoi.addActionListener(new Action_Listener(this));

this.filter = new PacketTypeFilter(Message.class);

this.con.addPacketListener(this, filter);

}

public boolean createConnexion(){

try{

//Create a connection to the jivesoftware.com XMPP server.

XMPPConnection.DEBUG_ENABLED = true;

XMPPConnection con = new XMPPConnection(“yourserver”);

// Most servers require you to login before performing other tasks.

con.login(“your username”, "your pasword);

this.chat = con.createChat(“username of friend”);

filter = new PacketTypeFilter(Message.class);

con.addPacketListener(this, filter);

return true;

}catch(XMPPException e){

e.getMessage();

return false;

}

}

public void processPacket(Packet packet) {

Message message = (Message)packet;

String from = message.getFrom();

String body = message.getBody();

this.rec.append(this.chat.getParticipant()+ " dit : \n " + body + “\n”);

}

public static void main (String[] args){

Fenetre fen = new Fenetre();

}

}

Thanks for help

EDIT : I’‘ve found that my exception came from the listener in the constructor that i’‘ve forget to remove … then I’'ve no Exception when I run the program but the messages null when I chat with a spark client are always receive.

I can made a filter when the received message body is null but I don’‘t know if it’'s the best solution…

Message was edited by: Slashsnakit

4

One more thing can you post your exact exception stack trace that you are getting?

5

I’‘ve found that my exception came from the listener in the constructor that i’‘ve forget to remove … then I’'ve no Exception when I run the program but the messages null when I chat with a spark client are always receive.

I can made a filter when the received message body is null but I don’‘t know if it’'s the best solution…

(You answer the same time I edit my post )

6

There are message packets sent by spark that are status updates, like that a message is being typed, etc. These messages don’‘t contain a body, so you’'ll always wawnt to check your Message packets to make sure they have a body.

Alex

7

Many Thanks! That’'s what I think and you confirm

Ok then I can continue to program

I’‘ve seen that you’'re Developper but you work for jive or they choose moderators on net programmers ?

It’'s cool to speak with programmers who have experience and lives so far.

Message was edited by: Slashsnakit

8

Thx to AWenckus