保存null值到缓存，get的时候报错 2.3.5-release

Exception in thread "main" java.lang.ClassCastException: java.lang.Object cannot be cast to java.io.Serializable


代码：
` public static void main(String[] args) {
        CacheChannel channel = J2Cache.getChannel();
        channel.set("region","key",null,true);
        System.out.println(channel.get("region","key"));
    }
`
