!7

p {
  S s = javaxDefaultVMArgs(), old = s;
  print("Default VM Args: " + quote(s));
  s = s.replaceAll("-XX:MaxHeapFreeRatio=\\d+", "");
  s = s.replaceAll("-XX:MinHeapFreeRatio=\\d+", "");
  s = trim(s);
  s = trim(s + " -XX:MaxHeapFreeRatio=20 -XX:MinHeapFreeRatio=10");
  if (!s.contains("-server")) s = trim("-server " + s);
  if (!s.contains("-XX:+UseG1GC")) s = trim(s + " -XX:+UseG1GC");
  if (!s.contains("-XX:+UseStringDeduplication"))
    s = trim(s + " -XX:+UseStringDeduplication");
  if (neq(old, s))
    setDefaultVMArgs(s);
  else
    print("Keeping.");
}

Began life as a copy of #1008034