code: public static ConfigurationOptionBuilder<Collection<String>> stringsOption() {
  		return new ConfigurationOptionBuilder<Collection<String>>(SetValueConverter.STRINGS_VALUE_CONVERTER, Collection.class)
  				.defaultValue(Collections.<String>emptySet());
  	}
docs: Constructs a {@link ConfigurationOptionBuilder} whose value is of type {@link List}&lt;{@link String}&gt;
  
  @return a {@link ConfigurationOptionBuilder} whose value is of type {@link List}&lt;{@link String}&gt;