int findOrCreateRootRecord(@NotNull String rootUrl) {
    checkNotClosed();
    try {
      return treeAccessor.findOrCreateRootRecord(rootUrl);
    }
    catch (Throwable t) {
      //not only IOException: almost everything thrown from .findOrCreateRootRecord() is a sign of VFS structure corruption
      throw handleError(t);
    }
  }
int findOrCreateRootRecord(@NotNull String rootUrl)