Unable to get presence of roster by using smack, openfire

Question

I am new to smack API. I am trying to develop a chat application where I was trying for setting and getting the presence.

When I change the presence of a user, its working perfectly fine and it is getting reflected in the Openfire Server.

But when I tries to get the Presence of a user, I am always getting the status as 'unavailable' even if his presence in openfire is showing as 'available'.

I am using the following code to set the status.

        Presence presence = new Presence(Presence.Type.available);
        presence.setStatus("Online, Programmatically!");
        presence.setPriority(24);
        presence.setMode(Presence.Mode.available);
        user.getConnection().sendPacket(presence);

I am using the Roster class to get the presence as follows.

Roster roster = avatar.getRoster();
Collection<RosterEntry> entries = roster.getEntries();

for(RosterEntry rosterEntry: entries) {
    String user = rosterEntry.getUser();

    Presence presence = roster.getPresence(user);

    System.out.println("Presence : "+presence);                                     // 1
    System.out.println("Presence type: "+presence.getType());                // 2
    System.out.println("Presence mode: "+presence.getMode());             // 3

}

Line No 1 alwasys gives 'unavailable' while line number 2 and 3 always give null

I am not able to figure out the cause of this problem. Please help me to resolve this issue.

Thanks in advance.

Answer 1

Using RosterListener is the proper solution to this problem. There is no reason that code should have a Thread.sleep() in order to make it work properly.

Roster roster = con.getRoster();
roster.addRosterListener(new RosterListener() {
    // Ignored events public void entriesAdded(Collection<String> addresses) {}
    public void entriesDeleted(Collection<String> addresses) {}
    public void entriesUpdated(Collection<String> addresses) {}
    public void presenceChanged(Presence presence) {
        System.out.println("Presence changed: " + presence.getFrom() + " " + presence);
    }
});

(source: http://www.igniterealtime.org/builds/smack/docs/latest/documentation/roster.html)

Answer 2

the problem is that after logging in immediately, it is gonna take some time for the presence of users to get updated.So between logging in and calling the online buddies function there should be a thread.sleep() for a few seconds.Then the online contacts will be retrieved. I did that and was able to retrieve them. after login use

Thread.sleep(5000);

use in the beginiing of the method also