public synchronized String getRejectionMessage()
        {
            if (!isRejected()) {
                throw new IllegalStateException( "Cannot get rejection message, as rejection did not occur." );
            }

            final Packet stanza = this.responses.get( this.responses.size() -1 );
            final Element fmuc = stanza.getElement().element(FMUC);
            return fmuc.elementText("reject");
        }
Retrieve and clean the list of stanzas that have been queued after federation was initiated, but before it
was finished.

@return A list of queued stanzas (possibly empty).
xmppserver/src/main/java/org/jivesoftware/openfire/muc/spi/FMUCHandler.java