code: private void fillDefault(final Map<String, Object> dataModel) {
          Keys.fillServer(dataModel);
          Keys.fillRuntime(dataModel);
      }
docs: Fills default values into the specified data model.
  
  <p>
  The default data model variable values includes:
  <ul>
  <li>{@code Keys.SERVER.*}</li>
  <li>{@code Keys.RUNTIME.*}</li>
  </ul>
  </p>
  
  @param dataModel the specified data model
  @see Keys#fillServer(java.util.Map)