warn(propertyName + " = " + propertyValue, e);
  static final Class getClassProperty(String propertyName, Class defaultValue)  {    Class usingClass = null;    try    {      String propertyValue = logManager.getProperty(propertyName);      if (propertyValue != null)        usingClass = Class.forName(propertyValue);      if (usingClass != null)        return usingClass;    }    catch (Exception _)    {    }    return defaultValue;  }