static L<File> hotwire_collectJars(File jar) {
  L<File> files = ll(jar);
  S dehlibs;
  try {
    dehlibs = unnull(loadTextFileFromZip(jar, "libraries"));
  } on fail {
    jar.delete();
  }
  
  for (S libID : regexpExtractAll("\\d+", dehlibs))
    files.add(loadLibraryOrSrcLib(libID));
  ret files;
}