Roster roster = connection.getRoster();
List pres_map = roster.getPresences(room);
Roster return null presenceMap in 4.0.0-rc1/
In 3.4.2 Smack Roster return not null
Roster roster = connection.getRoster();
List pres_map = roster.getPresences(room);
Roster return null presenceMap in 4.0.0-rc1/
In 3.4.2 Smack Roster return not null