public Collection<MUCOccupant> getParticipants() {
        return occupants.stream()
            .filter(occupant -> occupant.getRole() == Role.participant)
            .collect(Collectors.toUnmodifiableList());
    }
Returns a collection with the current list of room participants. The collection contains the
data of the occupants with participant role.

@return a collection with the current list of moderators.
xmppserver/src/main/java/org/jivesoftware/openfire/muc/MUCRoom.java