code: @Resetter
    public static void reset() {
      Object lock = reflector(ReflectorMessage.class).getPoolSync();
      synchronized (lock) {
        reflector(ReflectorMessage.class).setPoolSize(0);
        reflector(ReflectorMessage.class).setPool(null);
      }
    }
docs: Resets the static state of the {@link Message} class by
  emptying the message pool.