public synchronized MultiUserChat getMultiUserChat(EntityBareJid jid) {
        WeakReference<MultiUserChat> weakRefMultiUserChat = multiUserChats.get(jid);
        if (weakRefMultiUserChat == null) {
            return createNewMucAndAddToMap(jid);
        }
        MultiUserChat multiUserChat = weakRefMultiUserChat.get();
        if (multiUserChat == null) {
            return createNewMucAndAddToMap(jid);
        }
        return multiUserChat;
    }
public synchronized MultiUserChat getMultiUserChat ( EntityBareJid jid ) { WeakReference < MultiUserChat > weakRefMultiUserChat = multiUserChats . get ( jid ) ; if ( weakRefMultiUserChat == null ) { return createNewMucAndAddToMap ( jid ) ; } MultiUserChat multiUserChat = weakRefMultiUserChat . get ( ) ; if ( multiUserChat == null ) { return createNewMucAndAddToMap ( jid ) ; } return multiUserChat ; }
Creates a multi user chat. Note: no information is sent to or received from the server until you attempt to
{@link MultiUserChat#join(org.jxmpp.jid.parts.Resourcepart) join} the chat room. On some server implementations, the room will not be
created until the first person joins it.
<p>
Most XMPP servers use a sub-domain for the chat service (eg chat.example.com for the XMPP server example.com).
You must ensure that the room address you're trying to connect to includes the proper chat sub-domain.
</p>

@param jid the name of the room in the form "roomName@service", where "service" is the hostname at which the
multi-user chat service is running. Make sure to provide a valid JID.
@return MultiUserChat instance of the room with the given jid.