code: protected Properties loadProperties(String fileName) {
          final Properties props = new Properties();
          final InputStream ins = LastaDiProperties.class.getClassLoader().getResourceAsStream(fileName);
          if (ins == null) {
              return null;
          }
          try {
              props.load(ins);
          } catch (RuntimeException | IOException e) {
              handleLoadingFailureException(fileName, e);
          } finally {
              try {
                  ins.close();
              } catch (IOException ignored) {}
          }
          mergePropIfExists(fileName, props);
          return props;
      }
docs: ============