svoid replaceACCInClassLoader(O o, AccessControlContext newACC) {
  ClassLoader cl = getClassLoader(o);
  if (cl instanceof URLClassLoader) pcall {
    setOpt(cl, acc := newACC);
    try {
      setOpt(getOpt(cl, 'ucp), acc := newACC); // TODO
    } catch e {
      printShortException(e);
      if (java10OrHigher())
        if (addDefaultVMOption("--add-opens java.base/jdk.internal.loader=ALL-UNNAMED"))
          print("Please restart the OS");
    }
  }
}