Java JsonPath数组长度

我有这样一个Json:

{
    "hello": {
        "hello": [
            {
                "wwrjgn": "aerg",
                "aaa": "gggg",
                "rfshs": {
                    "segse": "segsegs",
                    "xx": "rgwgwgw",
                    "x-e ": "eergye"
                },
                "egg": "sgsese",
                "segess": "sgeses",
                "segess": "segess"
            },
            {
                "esges": "segesse",
                "segesg": "ws",
                "rddgdr": {
                    "rdrdrdg": “srgsesees"
                },
                "drr": 3600,
                "esese": "uytk",
                "wew": "699",
                "eses": “qe4ty"
            }
        ],
        "how": www"
    }
}

我执行以下操作:

Object document = 
Configuration.defaultConfiguration().addOptions().jsonProvider()
            .parse(ka.toJSONString());
int queries = JsonPath.read(document, "$..hello.length()");

    System.out.println("THE LENGTH OF THE NUMBER OF QUERIES " + queries);

我得到:

nested exception is java.lang.ClassCastException: net.minidev.json.JSONArray 
cannot be cast to java.base/java.lang.Integer] with root cause
java.lang.ClassCastException: net.minidev.json.JSONArray cannot be cast to 
java.base/java.lang.Integer

在此处尝试: http://jsonpath.herokuapp.com/?path= $。。你好长度() 我得到:

[
   2,
   2
]

这正是我需要的。

知道我做错了什么吗? 提前谢谢。