please include function getOpt_cached.

static Field findField2(O o, S field) {
  Class c = o.getClass();
  HashMap<S, Field> map;
  synchronized(getOpt_cache) {
    map = getOpt_cache.get(c);
    if (map == null)
      map = getOpt_makeCache(c);
  }
  
  if (map == getOpt_special) {
    if (o instanceof Class)
      ret findField2_findStaticField((Class) o, field);
  }
    
  ret map.get(field);
}

static Field findField2_findStaticField(Class<?> c, String field) {
  Class _c = c;
  do {
    for (Field f : _c.getDeclaredFields())
      if (f.getName().equals(field) && (f.getModifiers() & java.lang.reflect.Modifier.STATIC) != 0)
        return f;
    _c = _c.getSuperclass();
  } while (_c != null);
  ret null;
}

Began life as a copy of #1002772