Re: hello, my question: RoomInfo info = MultiUserChat.getRoomInfo(xmppConnection, entry.getJid()); then cast this exception!

thanks for everyone!

I'v solved this problem, must add this code:

ProviderManager pm = ProviderManager.getInstance();

pm.addExtensionProvider("x", "jabber:x:data", new DataFormProvider());

...

RoomInfo info = MultiUserChat.getRoomInfo(xmppConnection, entry.getJid());

so, solved this problem.