Redis存储点赞数据时，为何出现java.lang.ClassCastException异常？

@override
public void saveliked2redis(string likeuserid, string likepostid, string likeanswerid) {
    string key = rediskeyutils.getlikedkey(likeuserid, likepostid, likeanswerid);
    redistemplate.opsforhash().put(rediskeyutils.map_key_user_liked, key, constant.redis_like_code);
}

//点赞
@requiresauthentication
@requestmapping("/userlike")
public responsejson userlike(@requestbody userlike userlike) {
    redisservice.saveliked2redis(userlike.getlikeuserid(), userlike.getlikepostid(), userlike.getlikeanswerid());
    return new responsejson(constant.http_code_ok, null, "点赞成功");
}

public class userlike {
    private integer id;//主键id
    private string likeuserid;//点赞人id
    private string likepostid;//被点赞文章id
    private string likeanswerid;//被点赞回答id
    private integer status = 0;//点赞的状态，默认未点赞0 0：未点赞 1：已点赞
    //省略了构造部分
}

java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String