@Override
    @SuppressWarnings("unchecked")
    public Class<IPolicyFailureWriter> getPolicyFailureWriterClass(IPluginRegistry pluginRegistry) {
        return (Class<IPolicyFailureWriter>) loadConfigClass(GatewayConfigProperties.FAILURE_WRITER_CLASS,
                IPolicyFailureWriter.class, pluginRegistry, DefaultPolicyFailureWriter.class);
    }
@see io.apiman.gateway.engine.IEngineConfig#getDataEncrypterConfig()
gateway/platforms/war/src/main/java/io/apiman/gateway/platforms/war/WarEngineConfig.java