static Map<S, Class> classForName_cache = synchroHashMap();

static Class classForName(S name) ctex {
  if (classForName_cache == null) ret Class.forName(name); // in class init
  Class c = classForName_cache.get(name);
  if (c == null)
    classForName_cache.put(name, c = Class.forName(name));
  ret c;
}