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我正在尝试解析一个类，出于某种原因，Jackson（实际上是 Scala 中的 Jerkson 接口）正在转储。我猜这可能与BoardOpen成为一个类的子MessageEvent类有关：

class BoardOpen(

  override val channel: String

) extends MessageEvent(channel)

和

class MessageEvent( val channel: String = "/" )

完整的错误：

The error com.codahale.jerkson.ParsingException: No suitable constructor found
for type [simple type, class engine.event.BoardOpen]: can not instantiate from J
SON object (need to add/enable type information?)
 at [Source: java.io.StringReader@4004c5b3; line: 1, column: 2]
        at com.codahale.jerkson.ParsingException$.apply(ParsingException.scala:17)
        at com.codahale.jerkson.Parser$class.parse(Parser.scala:86)
        at com.codahale.jerkson.Json$.parse(Json.scala:6)
        at com.codahale.jerkson.Parser$class.parse(Parser.scala:14)
        at com.codahale.jerkson.Json$.parse(Json.scala:6)
        at controllers.socket.MessageParser$.matchMsg(MessageParser.scala:59)
        at controllers.socket.MessageParser$.parseRawMessage(MessageParser.scala:90)
        at controllers.socket.MessageParser$.readStringMsg(MessageParser.scala:42)

这就是我去解析数据时发生的事情：

msgCase match {
       case "BoardOpen"            => parse[BoardOpen](msgData)

JSON看起来像：

{"channel":"/board"}

任何想法为什么它失败了？谢谢。

更新：

因为只有channel属性需要担心，所以我想我会看看如果我将解析更改为会发生什么parse[MessageEvent](msgData)，奇怪的是它会吐出同样的错误：

The error com.codahale.jerkson.ParsingException: No suitable constructor found
for type [simple type, class com.alloyengine.powder.MessageEvent]: can not insta
ntiate from JSON object (need to add/enable type information?)
 at [Source: java.io.StringReader@34fd2520; line: 1, column: 2]
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