code: private static void setDefaultProperties(CitrusAppConfiguration configuration) {
          for (Map.Entry<String, String> entry : configuration.getDefaultProperties().entrySet()) {
              log.debug(String.format("Setting application property %s=%s", entry.getKey(), entry.getValue()));
              System.setProperty(entry.getKey(), Optional.ofNullable(entry.getValue()).orElse(""));
          }
      }
docs: Reads default properties in configuration and sets them as system properties.
  @param configuration