private static void logRoots(@NonNls @NotNull String prefix, @NotNull Collection<? extends VirtualFile> roots) {
    if (LOG.isDebugEnabled()) {
      LOG.debug(prefix + ": " + join(roots, VirtualFile::getPath, ", "));
    }
  }
private static void logRoots(@NonNls @NotNull String prefix, @NotNull Collection<? extends VirtualFile> roots)