docs: public String getClassification() {
          Metadata metadata;
          try {
              metadata = this.getMetadata(Metadata.CLASSIFICATION_TEMPLATE_KEY);
  
          } catch (BoxAPIException e) {
              JsonObject responseObject = JsonObject.readFrom(e.getResponse());
              String code = responseObject.get("code").asString();
  
              if (e.getResponseCode() == 404 && code.equals("instance_not_found")) {
                  return null;
              } else {
                  throw e;
              }
          }
  
          return metadata.getString(Metadata.CLASSIFICATION_KEY);
      }