public void setFmucEnabled(boolean fmucEnabled) {
        this.fmucEnabled = fmucEnabled;
    }
Sets if this room accepts FMUC joins. By default, FMUC functionality is not enabled.
When joining nodes are attempting a join, a rejection will be returned when this feature is disabled.
xmppserver/src/main/java/org/jivesoftware/openfire/muc/MUCRoom.java