private static ConfigInstance.Builder newBuilderInstance(ConfigKey<ConfigInstance> key) {
        try {
            return builderClass(key).getDeclaredConstructor().newInstance();
        } catch (InstantiationException | IllegalAccessException | InvocationTargetException | NoSuchMethodException e) {
            throw new RuntimeException("ConfigInstance builder cannot be instantiated", e);
        }
    }
@author Tony Vaagenes
@author gjoranv
@author ollivir
standalone-container/src/main/java/com/yahoo/container/standalone/StandaloneSubscriberFactory.java