code: public <T extends RestTemplate> T build(Class<T> restTemplateClass) {
  		return configure(BeanUtils.instantiateClass(restTemplateClass));
  	}
docs: Build a new {@link RestTemplate} instance of the specified type and configure it
  using this builder.
  @param <T> the type of rest template
  @param restTemplateClass the template type to create
  @return a configured {@link RestTemplate} instance.
  @see RestTemplateBuilder#build()
  @see #configure(RestTemplate)