public static Retrofit2ConverterFactory create(FastJsonConfig fastJsonConfig) {
        if (fastJsonConfig == null) throw new NullPointerException("fastJsonConfig == null");
        return new Retrofit2ConverterFactory(fastJsonConfig);
    }
@author ligboy, wenshao
@author Victor.Zxy
src/main/java/com/alibaba/fastjson/support/retrofit/Retrofit2ConverterFactory.java