code: private void readPropertiesFile(final String custConfFileName) {
  
          final Properties p = new Properties();
  
          LOGGER.log(READ_CONF_FILE, custConfFileName);
  
          try (InputStream is = ClasspathUtility.loadInputStream(custConfFileName)) {
  
              // Read the properties file
              p.load(is);
  
              for (final Map.Entry<Object, Object> entry : p.entrySet()) {
                  if (this.propertiesParametersMap.containsKey(entry.getKey())) {
                      LOGGER.log(UPDATE_PARAMETER, entry.getKey(), entry.getValue());
                  } else {
                      LOGGER.log(STORE_PARAMETER, entry.getKey(), entry.getValue());
                  }
                  storePropertiesParameter(entry);
  
              }
  
          } catch (final IOException e) {
              LOGGER.error(CONF_READING_ERROR, custConfFileName);
          }
  
      }
docs: Read a customized configuration file to load parameters values.
  
  @param custConfFileName the file to load