RestTemplate httpClientTemplate = new RestTemplate();
            List<HttpMessageConverter<?>> converters = httpClientTemplate.getMessageConverters();
            List<HttpMessageConverter<?>> convertersValid = new ArrayList<HttpMessageConverter<?>>();
            for (HttpMessageConverter<?> converter : converters) {
                if (converter instanceof MappingJackson2HttpMessageConverter || converter instanceof MappingJackson2XmlHttpMessageConverter)
                    continue;
                convertersValid.add(converter);
            }
            convertersValid.add(new FastJsonHttpMessageConverter());
            httpClientTemplate.setMessageConverters(convertersValid);