ReactiveMongo +播放通用NullPointerException

Question

我正试图为我的应用程序加入一个非常简单的Mongo模型，但我最初的尝试是徒劳的。我被一个NullPointerException卡住了，我甚至尝试用Try包装我的电话，最后得到一个Success(scala.concurrent.impl.Promise$DefaultPromise@1f02f0b3)

这是密码

  def token = Action.async(parse.json) { request =>
    request.body.validate[Auth].map { creds =>
      UserService.login(creds.username, creds.password).map {
        case Some(context) =>
          val accessToken = TokenResponse(Crypto.generateToken)
          val model = Json.toJson(context)
          val res = Try(collection.insert(model).map(_ => Ok(Json.toJson(accessToken))))
          println(res.toString)
          res.get
        case _ => Future(BadRequest)
      }.flatMap(identity)
    } recoverTotal (request => Future(Unauthorized))
  }

下面是错误(注意在调用堆栈中没有引用我的应用程序)：

play.api.Application$$anon$1: Execution exception[[NullPointerException: null]]
    at play.api.Application$class.handleError(Application.scala:296) ~[play_2.11-2.3.6.jar:2.3.6]
    at play.api.DefaultApplication.handleError(Application.scala:402) [play_2.11-2.3.6.jar:2.3.6]
    at play.core.server.netty.PlayDefaultUpstreamHandler$$anonfun$3$$anonfun$applyOrElse$4.apply(PlayDefaultUpstreamHandler.scala:320) [play_2.11-2.3.6.jar:2.3.6]
    at play.core.server.netty.PlayDefaultUpstreamHandler$$anonfun$3$$anonfun$applyOrElse$4.apply(PlayDefaultUpstreamHandler.scala:320) [play_2.11-2.3.6.jar:2.3.6]
    at scala.Option.map(Option.scala:145) [scala-library-2.11.2.jar:na]
Caused by: java.lang.NullPointerException: null
    at reactivemongo.bson.buffer.WritableBuffer$class.writeString(buffer.scala:71) ~[reactivemongo-bson_2.11-0.10.5.0.akka23.jar:0.10.5.0.akka23]
    at reactivemongo.core.netty.ChannelBufferWritableBuffer.writeString(netty.scala:61) ~[reactivemongo_2.11-0.10.5.0.akka23.jar:0.10.5.0.akka23]
    at reactivemongo.bson.buffer.DefaultBufferHandler$BSONStringBufferHandler$.write(bufferhandlers.scala:83) ~[reactivemongo-bson_2.11-0.10.5.0.akka23.jar:0.10.5.0.akka23]
    at reactivemongo.bson.buffer.DefaultBufferHandler$BSONStringBufferHandler$.write(bufferhandlers.scala:82) ~[reactivemongo-bson_2.11-0.10.5.0.akka23.jar:0.10.5.0.akka23]
    at reactivemongo.bson.buffer.DefaultBufferHandler$.serialize(bufferhandlers.scala:227) ~[reactivemongo-bson_2.11-0.10.5.0.akka23.jar:0.10.5.0.akka23]

我试着使用Postman，最后得到了这个引用，但没有多大帮助：

app/controllers/Application.scala:27

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Answer 1

结果是simple...my产生的JSON有空值，而ReactiveMongo不喜欢这样。我将提交一个错误，以优雅的失败，或至少更多的描述。