private void applyAffiliationChangeAndSendPresence(JID groupMember) {
        final List<Presence> presences = applyAffiliationChange(groupMember, null, null, null);
        for (Presence presence : presences) {
            send(presence, this.getSelfRepresentation());
        }
    }
Saves the room configuration to the DB. After the room has been saved to the DB it will
become persistent.
xmppserver/src/main/java/org/jivesoftware/openfire/muc/MUCRoom.java