!7

p {
  S s = javaxDefaultVMArgs();
  print("Default VM Args: " + quote(s));
  S fix = "-XX:MaxHeapFreeRatio=30 -XX:MinHeapFreeRatio=10 -XX:+UseG1GC";
  if (!contains(s, fix))
    setDefaultVMArgs(s + " " + fix);
  else
    print("Keeping.");
}