I am using smack 1.5.1. There is a problem when I use invitationReceived listener and to join Conference. The list of Conference Roster is always null if I use join MUC in invitationReceived event. And I cannot display the roster in the left of Conference Window. But, when the new action comes, for example a user joined the conference, the roster does well. I do not know why?
Thanks in advance!