docs: public static long getLong(Properties config, String key, long defaultValue) {
  		String val = config.getProperty(key);
  		if (val == null) {
  			return defaultValue;
  		} else {
  			try {
  				return Long.parseLong(val);
  			} catch (NumberFormatException nfe) {
  				throw new IllegalArgumentException("Value for configuration key='" + key + "' is not set correctly. " +
  						"Entered value='" + val + "'. Default value='" + defaultValue + "'");
  			}
  		}
  	}