为什么我不能用这个制作带键的 stream

Question

我一直在尝试不同的方法，但无法正确。 这段代码有什么问题？

  def main(args: Array[String]): Unit = {
    val TEMPERATURE_THRESHOLD: Double = 50.00

    val see: StreamExecutionEnvironment = StreamExecutionEnvironment.getExecutionEnvironment

    val properties = new Properties()
    properties.setProperty("bootstrap.servers", "localhost:9092")
    properties.setProperty("zookeeper.connect", "localhost:2181")

    val src  = see.addSource(new FlinkKafkaConsumer010("broadcast",
      new JSONKeyValueDeserializationSchema(true), properties))

    src.map {
      v =>
        val key = v.get("locationID").asText
        val temperature = v.get("temp").asDouble()
        (key, temperature)
    }
        .keyBy(v => v._2)


    src.print()
    see.execute()

    case class Event(locationID: String, temp: Double)

当 flink 读取到阈值以上的值时，我想要一个警报

[{"locationID": "ASK","temp": 35},
{"locationID": "BC","temp": 45},
{"locationID":"CHD","temp": 55},
{"locationID": "RAJ","temp": 65},
{"locationID": "EGY","temp": 55}]

我得到的错误是：

作业执行失败