@Override
    @SuppressWarnings("unchecked")
    public Class<IPluginRegistry> getPluginRegistryClass() {
        return (Class<IPluginRegistry>) loadConfigClass(GatewayConfigProperties.PLUGIN_REGISTRY_CLASS, IPluginRegistry.class, null);
    }
@return the class to use as the {@link IPluginRegistry}
gateway/platforms/war/src/main/java/io/apiman/gateway/platforms/war/WarEngineConfig.java