class RequestBodyConverter<T>
            implements Converter<T, RequestBody> {
        RequestBodyConverter() {
        }

        @Override
        public RequestBody convert(T value) throws IOException {<FILL_FUNCTION_BODY>}
    }

            try {
                byte[] content = JSON.toJSONBytes(value,
                        fastJsonConfig.getSerializeFilters(), fastJsonConfig.getSerializerFeatures());
                return RequestBody.create(MEDIA_TYPE, content);
            } catch (Exception e) {
                throw new IOException("Could not write JSON: " + e.getMessage(), e);
            }
        
<no_super_class>