please include function jnativehook_init.
import org.jnativehook.keyboard.NativeKeyEvent;

static cached Map<S, Int> jNativeHook_keyCodes() {
  TreeMap<S, Int> map = new(new AlphanumComparator);
  new Matches m;
  for (S field : fieldNames(NativeKeyEvent.class))
    if (startsWith(field, "VC_", m))
      map.put(m.rest(), toInt(get(NativeKeyEvent, field)));
  ret map;
}