@Override
  public void removeAllRoots() {
    final List<OrderRootType> types = new ArrayList<>(getOrderRootTypes());
    for (OrderRootType type : types) {
      final String[] urls = getUrls(type);
      for (String url : urls) {
        removeRoot(url, type);
      }
    }
  }
@Override
  public void removeAllRoots()