Google app engine 没有合适的构造器google应用程序引擎

我试图在我的google数据存储中插入数据，因此我通过google API explorer发送此请求：

    POST https://local-sport-meeting-app.appspot.com/_ah/api/localSportMeetingApi/v1/rencontre

Content-Type:  application/json
X-JavaScript-User-Agent:  Google APIs Explorer

{
 "date": {
  "day": 30,
  "hour": 20,
  "minute": 15,
  "month": 11,
  "year": 2014
 },
 "idComp": "5153049148391424",
 "idParticipant2": "5664902681198592",
 "idPartiticpant1": "5734055144325120",
 "latitude": 3.105024,
 "lieu": "STADE MARCEL MICHELIN\"",
 "longitude": 45.789907
}

但这将返回以下错误：

400 Bad Request

- Show headers -

{
 "error": {
  "errors": [
   {
    "domain": "global",
    "reason": "badRequest",
    "message": "com.google.appengine.repackaged.org.codehaus.jackson.map.JsonMappingException: No suitable constructor found for type [simple type, class com.iutclermont.lpmobile.localsportmeeting.backend.DatePerso]: can not instantiate from JSON object (need to add/enable type information?)\n at [Source: N/A; line: -1, column: -1] (through reference chain: com.iutclermont.lpmobile.localsportmeeting.backend.Rencontre[\"date\"])"
   }
  ],
  "code": 400,
  "message": "com.google.appengine.repackaged.org.codehaus.jackson.map.JsonMappingException: No suitable constructor found for type [simple type, class com.iutclermont.lpmobile.localsportmeeting.backend.DatePerso]: can not instantiate from JSON object (need to add/enable type information?)\n at [Source: N/A; line: -1, column: -1] (through reference chain: com.iutclermont.lpmobile.localsportmeeting.backend.Rencontre[\"date\"])"
 }
}

我在android studio中使用Objectify和应用程序引擎模块生成实体，并且根据Objectify的请求，我有一个空构造函数

是否有人已经有这个问题或知道如何解决它。

---

谢谢。

这里也有同样的问题。。。你找到解决办法了吗？当然找到了，因为这是一个学术项目，我完成了。但不幸的是，我无法告诉你。。。我遇到这个问题已经一年了。顺便说一句，我可能仍然有来源，所以我会看看我是否能找到答案。但我不能保证