code: private MetaInfo tryFetchMetaInfo(URI jsonSchemaUri) {
          if (jsonSchemaUri == null) return null;
          try {
              metaInfo = doFetchMetaInfo(jsonSchemaUri);
              Validator validator = metaInfo.getDefaultValidator();
              if (validator != null) {
                  getValidators().add(validator);
              }
          } catch (Exception ex) {
              return null;
          }
  
          return metaInfo;
      }
docs: Tries to fetch a schema and add the default Schema validator for it
  
  @param jsonSchemaUri
  @return