如何修复com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException：无法识别的字段“ sizeMapDefined”

Question

我们是Scala和Apache Flink的新手。当我们尝试使用ObjectMapper [com.fasterxml.jackson.databind.ObjectMapper]将scala.collection.mutable.Map转换为Scala POJO类时，出现无法识别的字段“ sizeMapDefined”异常。

com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException：无法识别的字段“ sizeMapDefined”（com.test.model.Data类），未标记为可忽略

在apache flink的帮助下尝试将AMPS（crankuptheamps）中的数据作为DataStream订阅。

import com.fasterxml.jackson.annotation.JsonIgnoreProperties
import scala.beans.BeanProperty

@JsonIgnoreProperties(ignoreUnknown = true)
@SerialVersionUID(123L)
class Data() extends Serializable {

  @BeanProperty var name: String = _
  @BeanProperty var address: String = _

  override def toString = s"Data($name, $address)"
}

@transient lazy val mapper = new ObjectMapper() with Serializable with ScalaObjectMapper
mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
mapper.registerModule(DefaultScalaModule)




var map = scala.collection.mutable.Map("name" -> "Thiru",
            "address" -> "Mayiladuthurai")
val testClass = mapper.convertValue(map, classOf[Data])