public PresenceUpdateHandler getPresenceUpdateHandler() {
        return (PresenceUpdateHandler) modules.get(PresenceUpdateHandler.class);
    }
Returns the <code>PresenceUpdateHandler</code> registered with this server. The
<code>PresenceUpdateHandler</code> was registered with the server as a module while starting
up the server.

@return the <code>PresenceUpdateHandler</code> registered with this server.
xmppserver/src/main/java/org/jivesoftware/openfire/XMPPServer.java