static L<File> hotwire_collectJars(File jar) {
  LS libIDs;
  try {
    libIDs = hotwire_libraryIDsFromJar(jar);
  } on fail {
    jar.delete();
  }
  
  L<File> files = ll(jar);
  for (S libID : libIDs)
    files.add(loadLibraryOrSrcLib(libID));
  ret files;
}