code: public String replacePlaceholders(String value, PlaceholderResolver placeholderResolver) {
  		Assert.notNull(value, "'value' must not be null");
  		return parseStringValue(value, placeholderResolver, new HashSet<String>());
  	}
docs: Replaces all placeholders of format {@code ${name}} with the value returned
  from the supplied {@link PlaceholderResolver}.
  @param value the value containing the placeholders to be replaced
  @param placeholderResolver the {@code PlaceholderResolver} to use for replacement
  @return the supplied value with placeholders replaced inline