code: public static void isBlank(String text, String message) {
          if (StringUtils.isBlank(text)) {
              throw new IllegalArgumentException(message);
          }
      }
docs: Assert that the given String is not empty; that is,
  it must not be {@code null} and not the empty String.
  <pre class="code">Assert.hasLength(name, "Name must not be empty");</pre>
  
  @param text the String to check
  @param message the exception message to use if the assertion fails
  @see org.apache.commons.lang3.StringUtils#isBlank