code: public static void NPE(Object o1, Object o2, Object o3) {
          if (null == o1 || null == o2 || null == o3) {
              throw new NullPointerException();
          }
      }
docs: Throws out {@link NullPointerException} if `o1` or `o2` or `o3` is `null`.
  @param o1
  the first object to be evaluated
  @param o2
  the second object to be evaluated
  @param o3
  the third object to be evaluated