public static void main(String[] args) throws IllegalArgumentException, IllegalAccessException {

String jsonStr = "{ \"base.store\": {\"book\": [{\"price2\": 8.95},{ \"price2\": [8.95,1234,5678]}]}}";
	
	JSONObject jsonObject = JSON.parseObject(jsonStr);
	System.out.println(JSONPath.size(jsonObject, "$.base\\.store.book.price2"));
}

price2有两个，但是获得结果是4