private void reListenRpc(QrConfig cfg) {
        unregisterInSlobrok();
        if (supervisor == null) {
            setupRpc(cfg);
        } else if (cfg.rpc().enabled()) {
            listenRpc(cfg);
        }
    }
Do not delete this method even if it's empty.
Calling this methods forces this class to be loaded,
which runs the static block.
container-disc/src/main/java/com/yahoo/container/jdisc/ConfiguredApplication.java