!7

p {
  S s = javaxDefaultVMArgs(), old = s;
  print("Default VM Args: " + quote(s));
  if (!s.contains("-Djava.awt.headless=true")) s = trim(s + " -Djava.awt.headless=true");
  if (neq(old, s))
    setDefaultVMArgs(s);
  else
    print("Keeping.");
}