code: public RestTemplateBuilder additionalMessageConverters(
  			HttpMessageConverter<?>... messageConverters) {
  		Assert.notNull(messageConverters, "MessageConverters must not be null");
  		return additionalMessageConverters(Arrays.asList(messageConverters));
  	}
docs: Add additional {@link HttpMessageConverter HttpMessageConverters} that should be
  used with the {@link RestTemplate}. Any converters configured on the builder will
  replace RestTemplate's default converters.
  @param messageConverters the converters to add
  @return a new builder instance
  @see #messageConverters(HttpMessageConverter...)