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Roster.getPresence(String) always returns null

I am doing a very simple Jabber bot with Smack. I set it up with

roster.setSubscriptionMode(Roster.SUBSCRIPTION_ACCEPT_ALL);

and then at some events, I want to send a message to everyone in my Roster that is presently online (no matter if they’'re away or whatever).

for (Iterator i = con.getRoster().getEntries(); i.hasNext(); ) {

RosterEntry entry = (RosterEntry) i.next();

Presence presence = con.getRoster().getPresence(entry.getUser());

System.out.println(“presence=’’” + presence);

}

This always prints “presence=null”, even for my own user that has the bot in its own roster and is definitely online. According to how I read the api docs, I should get a Presence object, but I always get null, for all users. Any ideas here?