code: public List<Classification> listAll(String classificationName) {
          assertArgumentNotNull("classificationName", classificationName);
          return findClassificationMeta(classificationName, () -> {
              return "listAll('" + classificationName + "')";
          }).listAll();
      }
docs: Get list of all classification.
  @param classificationName The name of classification. (NotNull)
  @return The list of all classification. (NotNull)