code: public WebServiceTemplateBuilder additionalMessageSenders(
  			WebServiceMessageSender... messageSenders) {
  		Assert.notNull(messageSenders, "MessageSenders must not be null");
  		return additionalMessageSenders(Arrays.asList(messageSenders));
  	}
docs: Add additional {@link WebServiceMessageSender WebServiceMessageSenders} that should
  be used with the {@link WebServiceTemplate}.
  @param messageSenders the message senders to add
  @return a new builder instance.
  @see #messageSenders(WebServiceMessageSender...)