please include function jdk_watchService_start.

svoid jdk_watchService_registerRecursivePath(File path, VF1<File> listener) ctex {
  final Set<File> listeningTo = synchroSet();
  VF1<File> listener = voidfunc(File f) {
    // TODO: remove listeners on deleted directory
    if (listeningTo.add(f))
      jdk_watchService_registerPath(f, this);
  };
  jdk_watchService_registerPath(path, listener, jdk_watchService_allEventKinds());
  for (File subDir : findAllDirs(path))
    jdk_watchService_registerPath(subDir, listener, jdk_watchService_allEventKinds());
}