如何调试scalajs链接器错误：不存在方法java.lang.Class.getDeclaredFields

将以下方法添加到后，将case类映射到

map

或

js.Dictionary

——现在我已经尝试了以下五到六种变体——我的代码编译良好，没有警告，但在

fastOptJS

sjs

链接阶段出错

方法 请注意，我尝试过的所有变体都以稍微不同的方式执行相同的操作

错误

[info]快速优化/Users/justin/Desktop/arete/jt/client/target/scala-2.11/client-fastopt.js
[错误]引用不存在的类java.lang.reflect.Field
[错误]从com.jshin47.jtdc.client.module.visualization.DiodeStateVizC$.ccToMap（java.lang.Object）scala.collection.immutable.Map调用
[错误]从com.jshin47.jtdc.client.module.visualization.DiodeStateVizC$调用（）
[错误]从com.jshin47.jtdc.client.module.landing.LandingLocC$$anonfun$2.apply（japgolly.scalajs.react.extra.router.RouterCtl）japgolly.scalajs.react.ReactElement调用
[错误]从com.jshin47.jtdc.client.module.landing.LandingLocC$$anonfun$2.apply（java.lang.Object）java.lang.Object调用
从scala.collection.LinearSeqOptimized$class.foreach（scala.collection.LinearSeqOptimized，scala.Function1）scala.Unit调用[error]
从scala.collection.mutable.MutableList.foreach（scala.Function1）scala.Unit调用[错误]
从scala.collection.TraversableLike$WithFilter.map（scala.Function1，scala.collection.generic.CanBuildFrom）java.lang.Object调用[error]
从scala.collection.immutable.Stream$StreamWithFilter.map（scala.Function1，scala.collection.generic.CanBuildFrom）java.lang.Object调用[error]
[错误]从org.scalajs.testinterface.internal.Slave.org$scalajs$testinterface$internal$Slave$$execute（scala.scalajs.js.Dynamic）scala.Unit调用
[错误]从org.scalajs.testinterface.internal.Slave.handlemsimpl（java.lang.String，scala.Function0）scala.Unit调用
[错误]从org.scalajs.testinterface.internal.BridgeBase.handleMsg（java.lang.String）scala.Unit调用
[错误]从org.scalajs.testinterface.internal.BridgeBase.$$anonfun$1（java.lang.String）scala.Unit调用
[错误]从org.scalajs.testinterface.internal.BridgeBase.init（）scala.Unit调用
[错误]从org.scalajs.testinterface.internal.BridgeBase.$$js$exported$meth$init（）java.lang.Object调用
[错误]从org.scalajs.testinterface.internal.BridgeBase.init调用
[错误]使用@JSExport导出到JavaScript
[错误]涉及实例化类：
[错误]com.jshin47.jtdc.client.module.visualization.DiodeStateVizC$
[错误]com.jshin47.jtdc.client.module.landing.LandingLocC$$anonfun$2
[错误]scala.collection.mutable.Queue
[错误]scala.collection.mutable.MutableList
[错误]scala.collection.TraversableLike$WithFilter
[错误]scala.collection.immutable.Stream$StreamWithFilter
[错误]org.scalajs.testinterface.internal.Slave
[错误]org.scalajs.testinterface.internal.Master
[错误]引用不存在的方法java.lang.Class.getDeclaredFields（）[java.lang.reflect.Field]
[错误]从com.jshin47.jtdc.client.module.visualization.DiodeStateVizC$.ccToMap（java.lang.Object）scala.collection.immutable.Map调用
[错误]从com.jshin47.jtdc.client.module.visualization.DiodeStateVizC$调用（）
[错误]从com.jshin47.jtdc.client.module.landing.LandingLocC$$anonfun$2.apply（japgolly.scalajs.react.extra.router.RouterCtl）japgolly.scalajs.react.ReactElement调用
[错误]从com.jshin47.jtdc.client.module.landing.LandingLocC$$anonfun$2.apply（java.lang.Object）java.lang.Object调用
从scala.collection.LinearSeqOptimized$class.foreach（scala.collection.LinearSeqOptimized，scala.Function1）scala.Unit调用[error]
从scala.collection.mutable.MutableList.foreach（scala.Function1）scala.Unit调用[错误]
从scala.collection.TraversableLike$WithFilter.map（scala.Function1，scala.collection.generic.CanBuildFrom）java.lang.Object调用[error]
从scala.collection.immutable.Stream$StreamWithFilter.map（scala.Function1，scala.collection.generic.CanBuildFrom）java.lang.Object调用[error]
[错误]从org.scalajs.testinterface.internal.Slave.org$scalajs$testinterface$internal$Slave$$execute（scala.scalajs.js.Dynamic）scala.Unit调用
[错误]从org.scalajs.testinterface.internal.Slave.handlemsimpl（java.lang.String，scala.Function0）scala.Unit调用
[错误]从org.scalajs.testinterface.internal.BridgeBase.handleMsg（java.lang.String）scala.Unit调用
[错误]从org.scalajs.testinterface.internal.BridgeBase.$$anonfun$1（java.lang.String）scala.Unit调用
[错误]从org.scalajs.testinterface.internal.BridgeBase.init（）scala.Unit调用
[错误]从org.scalajs.testinterface.internal.BridgeBase.$$js$exported$meth$init（）java.lang.Object调用
[错误]从org.scalajs.testinterface.internal.BridgeBase.init调用
[错误]使用@JSExport导出到JavaScript
[错误]涉及实例化类：
[错误]com.jshin47.jtdc.client.module.visualization.DiodeStateVizC$
[错误]com.jshin47.jtdc.client.module.landing.LandingLocC$$anonfun$2
[错误]scala.collection.mutable.Queue
[错误]scala.collection.mutable.MutableList
[错误]scala.collection.TraversableLike$WithFilter
[错误]scala.collection.immutable.Stream$StreamWithFilter
[错误]org.scalajs.testinterface.internal.Slave
[错误]org.scalajs.testinterface.internal.Master
[trace]堆栈跟踪被抑制：运行最后一个客户端/compile:fastOptJS以获得完整输出。
[错误]（客户端/编译：fastOptJS）存在链接错误
[错误]总时间：36秒，已完成2016年5月10日凌晨2:01:07

我试过的 由于不熟悉链接器的详细信息，我只能尝试一些“明显的”诊断：

• 无论我是否调用该方法，都会抛出此错误（它不必位于代码路径中，因此当方法本身被调用时会抛出此错误）

    def ccToMap(cc: AnyRef) =
      (Map[String, Any]() /: cc.getClass.getDeclaredFields) {
        (a, f) =>
          f.setAccessible(true)
          a + (f.getName -> f.get(cc))
      }
  

   [info] Fast optimizing /Users/justin/Desktop/arete/jt/client/target/scala-2.11/client-fastopt.js
   [error] Referring to non-existent class java.lang.reflect.Field
   [error]   called from com.jshin47.jtdc.client.module.visualization.DiodeStateVizC$.ccToMap(java.lang.Object)scala.collection.immutable.Map
   [error]   called from com.jshin47.jtdc.client.module.visualization.DiodeStateVizC$.<init>()
   [error]   called from com.jshin47.jtdc.client.module.landing.LandingLocC$$anonfun$2.apply(japgolly.scalajs.react.extra.router.RouterCtl)japgolly.scalajs.react.ReactElement
   [error]   called from com.jshin47.jtdc.client.module.landing.LandingLocC$$anonfun$2.apply(java.lang.Object)java.lang.Object
   [error]   called from scala.collection.LinearSeqOptimized$class.foreach(scala.collection.LinearSeqOptimized,scala.Function1)scala.Unit
   [error]   called from scala.collection.mutable.MutableList.foreach(scala.Function1)scala.Unit
   [error]   called from scala.collection.TraversableLike$WithFilter.map(scala.Function1,scala.collection.generic.CanBuildFrom)java.lang.Object
   [error]   called from scala.collection.immutable.Stream$StreamWithFilter.map(scala.Function1,scala.collection.generic.CanBuildFrom)java.lang.Object
   [error]   called from org.scalajs.testinterface.internal.Slave.org$scalajs$testinterface$internal$Slave$$execute(scala.scalajs.js.Dynamic)scala.Unit
   [error]   called from org.scalajs.testinterface.internal.Slave.handleMsgImpl(java.lang.String,scala.Function0)scala.Unit
   [error]   called from org.scalajs.testinterface.internal.BridgeBase.handleMsg(java.lang.String)scala.Unit
   [error]   called from org.scalajs.testinterface.internal.BridgeBase.$$anonfun$1(java.lang.String)scala.Unit
   [error]   called from org.scalajs.testinterface.internal.BridgeBase.init()scala.Unit
   [error]   called from org.scalajs.testinterface.internal.BridgeBase.$$js$exported$meth$init()java.lang.Object
   [error]   called from org.scalajs.testinterface.internal.BridgeBase.init
   [error]   exported to JavaScript with @JSExport
   [error] involving instantiated classes:
   [error]   com.jshin47.jtdc.client.module.visualization.DiodeStateVizC$
   [error]   com.jshin47.jtdc.client.module.landing.LandingLocC$$anonfun$2
   [error]   scala.collection.mutable.Queue
   [error]   scala.collection.mutable.MutableList
   [error]   scala.collection.TraversableLike$WithFilter
   [error]   scala.collection.immutable.Stream$StreamWithFilter
   [error]   org.scalajs.testinterface.internal.Slave
   [error]   org.scalajs.testinterface.internal.Master
   [error] Referring to non-existent method java.lang.Class.getDeclaredFields()     [java.lang.reflect.Field
   [error]   called from com.jshin47.jtdc.client.module.visualization.DiodeStateVizC$.ccToMap(java.lang.Object)scala.collection.immutable.Map
   [error]   called from com.jshin47.jtdc.client.module.visualization.DiodeStateVizC$.<init>()
   [error]   called from com.jshin47.jtdc.client.module.landing.LandingLocC$$anonfun$2.apply(japgolly.scalajs.react.extra.router.RouterCtl)japgolly.scalajs.react.ReactElement
   [error]   called from com.jshin47.jtdc.client.module.landing.LandingLocC$$anonfun$2.apply(java.lang.Object)java.lang.Object
   [error]   called from scala.collection.LinearSeqOptimized$class.foreach(scala.collection.LinearSeqOptimized,scala.Function1)scala.Unit
   [error]   called from scala.collection.mutable.MutableList.foreach(scala.Function1)scala.Unit
   [error]   called from scala.collection.TraversableLike$WithFilter.map(scala.Function1,scala.collection.generic.CanBuildFrom)java.lang.Object
   [error]   called from scala.collection.immutable.Stream$StreamWithFilter.map(scala.Function1,scala.collection.generic.CanBuildFrom)java.lang.Object
   [error]   called from org.scalajs.testinterface.internal.Slave.org$scalajs$testinterface$internal$Slave$$execute(scala.scalajs.js.Dynamic)scala.Unit
   [error]   called from org.scalajs.testinterface.internal.Slave.handleMsgImpl(java.lang.String,scala.Function0)scala.Unit
   [error]   called from org.scalajs.testinterface.internal.BridgeBase.handleMsg(java.lang.String)scala.Unit
   [error]   called from org.scalajs.testinterface.internal.BridgeBase.$$anonfun$1(java.lang.String)scala.Unit
   [error]   called from org.scalajs.testinterface.internal.BridgeBase.init()scala.Unit
   [error]   called from org.scalajs.testinterface.internal.BridgeBase.$$js$exported$meth$init()java.lang.Object
   [error]   called from org.scalajs.testinterface.internal.BridgeBase.init
   [error]   exported to JavaScript with @JSExport
   [error] involving instantiated classes:
   [error]   com.jshin47.jtdc.client.module.visualization.DiodeStateVizC$
   [error]   com.jshin47.jtdc.client.module.landing.LandingLocC$$anonfun$2
   [error]   scala.collection.mutable.Queue
   [error]   scala.collection.mutable.MutableList
   [error]   scala.collection.TraversableLike$WithFilter
   [error]   scala.collection.immutable.Stream$StreamWithFilter
   [error]   org.scalajs.testinterface.internal.Slave
   [error]   org.scalajs.testinterface.internal.Master
   [trace] Stack trace suppressed: run last client/compile:fastOptJS for the full output.
   [error] (client/compile:fastOptJS) There were linking errors
   [error] Total time: 36 s, completed May 10, 2016 2:01:07 AM