public boolean addOccupant( @Nonnull final JID occupant ) {
            Log.trace( "Adding remote occupant: '{}'", occupant );
            return occupants.add( occupant );
        }
The addresses of the occupants of the MUC that are joined through this FMUC node.
xmppserver/src/main/java/org/jivesoftware/openfire/muc/spi/FMUCHandler.java