我正在尝试运行此project ，我在 sbt 文件中添加了依赖项，我的 sbt 文件如下所示:
name := "HelloScala"
version := "0.1"
scalaVersion := "2.11.8"
libraryDependencies += "org.apache.spark" %% "spark-core" % "2.3.1"
resolvers += Resolver.bintrayRepo("salesforce", "maven")
libraryDependencies += "com.salesforce.transmogrifai" %% "transmogrifai-core" % "0.3.4"
然后我从他们的存储库复制了 Helloworld 文件夹，但遇到了很多问题。
Information:10/09/18, 12:01 PM - Compilation completed with 88 errors and 0 warnings in 15 s 624 ms
Error:scalac: missing or invalid dependency detected while loading class file 'package.class'.
Could not access type Vector in value org.apache.spark.ml.linalg,
because it (or its dependencies) are missing. Check your build definition for
missing or conflicting dependencies. (Re-run with `-Ylog-classpath` to see the problematic classpath.)
A full rebuild may help if 'package.class' was compiled against an incompatible version of org.apache.spark.ml.linalg.
Error:scalac: missing or invalid dependency detected while loading class file 'OPVector.class'.
Could not access type Vector in value org.apache.spark.ml.linalg,
because it (or its dependencies) are missing. Check your build definition for
missing or conflicting dependencies. (Re-run with `-Ylog-classpath` to see the problematic classpath.)
A full rebuild may help if 'OPVector.class' was compiled against an incompatible version of org.apache.spark.ml.linalg.
Error:scalac: missing or invalid dependency detected while loading class file 'OpEvaluatorBase.class'.
Could not access type Evaluator in value org.apache.spark.ml.evaluation,
because it (or its dependencies) are missing. Check your build definition for
missing or conflicting dependencies. (Re-run with `-Ylog-classpath` to see the problematic classpath.)
A full rebuild may help if 'OpEvaluatorBase.class' was compiled against an incompatible version of org.apache.spark.ml.evaluation.
Error:scalac: missing or invalid dependency detected while loading class file 'OpHasLabelCol.class'.
Could not access type Params in value org.apache.spark.ml.param,
because it (or its dependencies) are missing. Check your build definition for
missing or conflicting dependencies. (Re-run with `-Ylog-classpath` to see the problematic classpath.)
A full rebuild may help if 'OpHasLabelCol.class' was compiled against an incompatible version of org.apache.spark.ml.param.
Error:scalac: missing or invalid dependency detected while loading class file 'OpHasPredictionCol.class'.
Could not access type Params in value org.apache.spark.ml.param,
because it (or its dependencies) are missing. Check your build definition for
missing or conflicting dependencies. (Re-run with `-Ylog-classpath` to see the problematic classpath.)
A full rebuild may help if 'OpHasPredictionCol.class' was compiled against an incompatible version of org.apache.spark.ml.param.
Error:scalac: missing or invalid dependency detected while loading class file 'OpHasFullPredictionCol.class'.
Could not access type Params in value org.apache.spark.ml.param,
because it (or its dependencies) are missing. Check your build definition for
missing or conflicting dependencies. (Re-run with `-Ylog-classpath` to see the problematic classpath.)
A full rebuild may help if 'OpHasFullPredictionCol.class' was compiled against an incompatible version of org.apache.spark.ml.param.
Error:scalac: missing or invalid dependency detected while loading class file 'OpHasRawPredictionCol.class'.
Could not access type Params in value org.apache.spark.ml.param,
because it (or its dependencies) are missing. Check your build definition for
missing or conflicting dependencies. (Re-run with `-Ylog-classpath` to see the problematic classpath.)
A full rebuild may help if 'OpHasRawPredictionCol.class' was compiled against an incompatible version of org.apache.spark.ml.param.
Error:scalac: missing or invalid dependency detected while loading class file 'OpHasProbabilityCol.class'.
Could not access type Params in value org.apache.spark.ml.param,
because it (or its dependencies) are missing. Check your build definition for
missing or conflicting dependencies. (Re-run with `-Ylog-classpath` to see the problematic classpath.)
A full rebuild may help if 'OpHasProbabilityCol.class' was compiled against an incompatible version of org.apache.spark.ml.param.
Error:scalac: missing or invalid dependency detected while loading class file 'ClassificationModelSelector.class'.
Could not access type Estimator in package org.apache.spark.ml,
because it (or its dependencies) are missing. Check your build definition for
missing or conflicting dependencies. (Re-run with `-Ylog-classpath` to see the problematic classpath.)
A full rebuild may help if 'ClassificationModelSelector.class' was compiled against an incompatible version of org.apache.spark.ml.
Error:scalac: missing or invalid dependency detected while loading class file 'InputParams.class'.
Could not access type Params in value org.apache.spark.ml.param,
because it (or its dependencies) are missing. Check your build definition for
missing or conflicting dependencies. (Re-run with `-Ylog-classpath` to see the problematic classpath.)
A full rebuild may help if 'InputParams.class' was compiled against an incompatible version of org.apache.spark.ml.param.
Error:scalac: missing or invalid dependency detected while loading class file 'OpPipelineStageBase.class'.
Could not access type MLWritable in value org.apache.spark.ml.util,
because it (or its dependencies) are missing. Check your build definition for
missing or conflicting dependencies. (Re-run with `-Ylog-classpath` to see the problematic classpath.)
A full rebuild may help if 'OpPipelineStageBase.class' was compiled against an incompatible version of org.apache.spark.ml.util.
Error:scalac: missing or invalid dependency detected while loading class file 'HasLogisticRegression.class'.
Could not access type Params in value org.apache.spark.ml.param,
because it (or its dependencies) are missing. Check your build definition for
missing or conflicting dependencies. (Re-run with `-Ylog-classpath` to see the problematic classpath.)
A full rebuild may help if 'HasLogisticRegression.class' was compiled against an incompatible version of org.apache.spark.ml.param.
Error:scalac: missing or invalid dependency detected while loading class file 'HasRandomForestBase.class'.
Could not access type Params in value org.apache.spark.ml.param,
because it (or its dependencies) are missing. Check your build definition for
missing or conflicting dependencies. (Re-run with `-Ylog-classpath` to see the problematic classpath.)
A full rebuild may help if 'HasRandomForestBase.class' was compiled against an incompatible version of org.apache.spark.ml.param.
Error:scalac: missing or invalid dependency detected while loading class file 'HasDecisionTreeBase.class'.
Could not access type Params in value org.apache.spark.ml.param,
because it (or its dependencies) are missing. Check your build definition for
missing or conflicting dependencies. (Re-run with `-Ylog-classpath` to see the problematic classpath.)
A full rebuild may help if 'HasDecisionTreeBase.class' was compiled against an incompatible version of org.apache.spark.ml.param.
Error:scalac: missing or invalid dependency detected while loading class file 'HasNaiveBayes.class'.
Could not access type Params in value org.apache.spark.ml.param,
because it (or its dependencies) are missing. Check your build definition for
missing or conflicting dependencies. (Re-run with `-Ylog-classpath` to see the problematic classpath.)
A full rebuild may help if 'HasNaiveBayes.class' was compiled against an incompatible version of org.apache.spark.ml.param.
Error:scalac: missing or invalid dependency detected while loading class file 'DataReaders.class'.
Could not access type Encoder in package org.apache.spark.sql,
because it (or its dependencies) are missing. Check your build definition for
missing or conflicting dependencies. (Re-run with `-Ylog-classpath` to see the problematic classpath.)
A full rebuild may help if 'DataReaders.class' was compiled against an incompatible version of org.apache.spark.sql.
Error:scalac: missing or invalid dependency detected while loading class file 'OpWorkflow.class'.
Could not access type SparkSession in package org.apache.spark.sql,
because it (or its dependencies) are missing. Check your build definition for
missing or conflicting dependencies. (Re-run with `-Ylog-classpath` to see the problematic classpath.)
A full rebuild may help if 'OpWorkflow.class' was compiled against an incompatible version of org.apache.spark.sql.
Error:scalac: missing or invalid dependency detected while loading class file 'SplitterParams.class'.
Could not access type Params in value org.apache.spark.ml.param,
because it (or its dependencies) are missing. Check your build definition for
missing or conflicting dependencies. (Re-run with `-Ylog-classpath` to see the problematic classpath.)
A full rebuild may help if 'SplitterParams.class' was compiled against an incompatible version of org.apache.spark.ml.param.
Error:scalac: missing or invalid dependency detected while loading class file 'ModelSelectorBase.class'.
Could not access type Estimator in package org.apache.spark.ml,
because it (or its dependencies) are missing. Check your build definition for
missing or conflicting dependencies. (Re-run with `-Ylog-classpath` to see the problematic classpath.)
A full rebuild may help if 'ModelSelectorBase.class' was compiled against an incompatible version of org.apache.spark.ml.
Error:scalac: missing or invalid dependency detected while loading class file 'HasLinearRegression.class'.
Could not access type Params in value org.apache.spark.ml.param,
because it (or its dependencies) are missing. Check your build definition for
missing or conflicting dependencies. (Re-run with `-Ylog-classpath` to see the problematic classpath.)
A full rebuild may help if 'HasLinearRegression.class' was compiled against an incompatible version of org.apache.spark.ml.param.
Error:scalac: missing or invalid dependency detected while loading class file 'HasGradientBoostedTreeBase.class'.
Could not access type Params in value org.apache.spark.ml.param,
because it (or its dependencies) are missing. Check your build definition for
missing or conflicting dependencies. (Re-run with `-Ylog-classpath` to see the problematic classpath.)
A full rebuild may help if 'HasGradientBoostedTreeBase.class' was compiled against an incompatible version of org.apache.spark.ml.param.
Error:scalac: missing or invalid dependency detected while loading class file 'HasRandomForestBase.class'.
Could not access type Estimator in package org.apache.spark.ml,
because it (or its dependencies) are missing. Check your build definition for
missing or conflicting dependencies. (Re-run with `-Ylog-classpath` to see the problematic classpath.)
A full rebuild may help if 'HasRandomForestBase.class' was compiled against an incompatible version of org.apache.spark.ml.
Error:scalac: missing or invalid dependency detected while loading class file 'DataCutterParams.class'.
Could not access type Params in value org.apache.spark.ml.param,
because it (or its dependencies) are missing. Check your build definition for
missing or conflicting dependencies. (Re-run with `-Ylog-classpath` to see the problematic classpath.)
A full rebuild may help if 'DataCutterParams.class' was compiled against an incompatible version of org.apache.spark.ml.param.
Error:scalac: missing or invalid dependency detected while loading class file 'HasDecisionTreeBase.class'.
Could not access type Estimator in package org.apache.spark.ml,
because it (or its dependencies) are missing. Check your build definition for
missing or conflicting dependencies. (Re-run with `-Ylog-classpath` to see the problematic classpath.)
A full rebuild may help if 'HasDecisionTreeBase.class' was compiled against an incompatible version of org.apache.spark.ml.
Error:scalac: missing or invalid dependency detected while loading class file 'FeatureBuilder.class'.
Could not access term package in package org.apache.spark.sql,
because it (or its dependencies) are missing. Check your build definition for
missing or conflicting dependencies. (Re-run with `-Ylog-classpath` to see the problematic classpath.)
A full rebuild may help if 'FeatureBuilder.class' was compiled against an incompatible version of org.apache.spark.sql.
Error:scalac: missing or invalid dependency detected while loading class file 'FeatureBuilder.class'.
Could not access type DataFrame in value org.apache.spark.sql.package,
because it (or its dependencies) are missing. Check your build definition for
missing or conflicting dependencies. (Re-run with `-Ylog-classpath` to see the problematic classpath.)
A full rebuild may help if 'FeatureBuilder.class' was compiled against an incompatible version of org.apache.spark.sql.package.
Error:scalac: missing or invalid dependency detected while loading class file 'OpWorkflowCore.class'.
Could not access type Dataset in package org.apache.spark.sql,
because it (or its dependencies) are missing. Check your build definition for
missing or conflicting dependencies. (Re-run with `-Ylog-classpath` to see the problematic classpath.)
A full rebuild may help if 'OpWorkflowCore.class' was compiled against an incompatible version of org.apache.spark.sql.
/Users/monk/Desktop/HelloScala/src/main/scala/com/salesforce/hw/OpTitanicSimple.scala
Error:(42, 8) object SparkSession is not a member of package org.apache.spark.sql
import org.apache.spark.sql.SparkSession
Error:(95, 26) not found: value SparkSession
implicit val spark = SparkSession.builder.config(conf).getOrCreate()
Error:(143, 8) overloaded method value setLabelCol with alternatives:
(value: com.salesforce.op.features.FeatureLike[T])OpHasLabelCol.this.type <and>
(value: String)OpHasLabelCol.this.type
cannot be applied to (com.salesforce.op.features.Feature[com.salesforce.op.features.types.RealNN])
.setLabelCol(survived)
Error:(154, 64) could not find implicit value for evidence parameter of type org.apache.spark.sql.Encoder[com.salesforce.hw.Passenger]
val trainDataReader = DataReaders.Simple.csvCase[Passenger](
Error:(166, 40) could not find implicit value for parameter spark: org.apache.spark.sql.SparkSession
val fittedWorkflow = workflow.train()
Error:(174, 15) value columns is not a member of Any
dataframe.columns.foreach(println)
/Users/monk/Desktop/HelloScala/src/main/scala/com/salesforce/hw/boston/OpBoston.scala
Error:(41, 8) object Dataset is not a member of package org.apache.spark.sql
import org.apache.spark.sql.{Dataset, SparkSession}
Error:(41, 8) object SparkSession is not a member of package org.apache.spark.sql
import org.apache.spark.sql.{Dataset, SparkSession}
Error:(56, 47) not found: type SparkSession
def customRead(path: Option[String], spark: SparkSession): RDD[BostonHouse] = {
Error:(69, 90) not found: type Dataset
def readFn(params: OpParams)(implicit spark: SparkSession): Either[RDD[BostonHouse], Dataset[BostonHouse]] = {
Error:(69, 50) not found: type SparkSession
def readFn(params: OpParams)(implicit spark: SparkSession): Either[RDD[BostonHouse], Dataset[BostonHouse]] = {
Error:(77, 90) not found: type Dataset
def readFn(params: OpParams)(implicit spark: SparkSession): Either[RDD[BostonHouse], Dataset[BostonHouse]] = {
Error:(77, 50) not found: type SparkSession
def readFn(params: OpParams)(implicit spark: SparkSession): Either[RDD[BostonHouse], Dataset[BostonHouse]] = {
Error:(94, 6) value setGradientBoostedTreeSeed is not a member of com.salesforce.op.stages.impl.selector.HasRandomForestBase[E,MS]
possible cause: maybe a semicolon is missing before `value setGradientBoostedTreeSeed'?
.setGradientBoostedTreeSeed(randomSeed)
Error:(100, 43) overloaded method value setLabelCol with alternatives:
(value: com.salesforce.op.features.FeatureLike[T])OpHasLabelCol.this.type <and>
(value: String)OpHasLabelCol.this.type
cannot be applied to (com.salesforce.op.features.Feature[com.salesforce.op.features.types.RealNN])
val evaluator = Evaluators.Regression().setLabelCol(medv).setPredictionCol(prediction)
/Users/monk/Desktop/HelloScala/src/main/scala/com/salesforce/hw/dataprep/ConditionalAggregation.scala
Error:(40, 8) object SparkSession is not a member of package org.apache.spark.sql
import org.apache.spark.sql.SparkSession
Error:(69, 26) not found: value SparkSession
implicit val spark = SparkSession.builder.config(conf).getOrCreate()
/Users/monk/Desktop/HelloScala/src/main/scala/com/salesforce/hw/dataprep/JoinsAndAggregates.scala
Error:(40, 8) object SparkSession is not a member of package org.apache.spark.sql
import org.apache.spark.sql.SparkSession
Error:(74, 26) not found: value SparkSession
implicit val spark = SparkSession.builder.config(conf).getOrCreate()
/Users/monk/Desktop/HelloScala/src/main/scala/com/salesforce/hw/iris/IrisFeatures.scala
Error:(38, 36) not found: type Iris
val id = FeatureBuilder.Integral[Iris].extract(_.getID.toIntegral).asPredictor
Error:(39, 41) not found: type Iris
val sepalLength = FeatureBuilder.Real[Iris].extract(_.getSepalLength.toReal).asPredictor
Error:(40, 40) not found: type Iris
val sepalWidth = FeatureBuilder.Real[Iris].extract(_.getSepalWidth.toReal).asPredictor
Error:(41, 41) not found: type Iris
val petalLength = FeatureBuilder.Real[Iris].extract(_.getPetalLength.toReal).asPredictor
Error:(42, 40) not found: type Iris
val petalWidth = FeatureBuilder.Real[Iris].extract(_.getPetalWidth.toReal).asPredictor
Error:(43, 39) not found: type Iris
val irisClass = FeatureBuilder.Text[Iris].extract(_.getClass$.toText).asResponse
/Users/monk/Desktop/HelloScala/src/main/scala/com/salesforce/hw/iris/IrisKryoRegistrator.scala
Error:(40, 47) type Iris is not a member of package com.salesforce.hw.iris
doAvroRegistration[com.salesforce.hw.iris.Iris](kryo)
/Users/monk/Desktop/HelloScala/src/main/scala/com/salesforce/hw/iris/OpIris.scala
Error:(41, 8) object Dataset is not a member of package org.apache.spark.sql
import org.apache.spark.sql.{Dataset, SparkSession}
Error:(41, 8) object SparkSession is not a member of package org.apache.spark.sql
import org.apache.spark.sql.{Dataset, SparkSession}
Error:(56, 37) not found: type Iris
val irisReader = new CustomReader[Iris](key = _.getID.toString){
Error:(57, 76) not found: type Iris
def readFn(params: OpParams)(implicit spark: SparkSession): Either[RDD[Iris], Dataset[Iris]] = {
Error:(57, 83) not found: type Dataset
def readFn(params: OpParams)(implicit spark: SparkSession): Either[RDD[Iris], Dataset[Iris]] = {
Error:(57, 50) not found: type SparkSession
def readFn(params: OpParams)(implicit spark: SparkSession): Either[RDD[Iris], Dataset[Iris]] = {
Error:(79, 6) value setInput is not a member of com.salesforce.op.stages.impl.selector.HasDecisionTreeBase[E,MS]
possible cause: maybe a semicolon is missing before `value setInput'?
.setInput(labels, features).getOutput()
Error:(87, 53) type mismatch;
found : Any
required: com.salesforce.op.features.FeatureLike[_ <: com.salesforce.op.features.types.FeatureType]
val workflow = new OpWorkflow().setResultFeatures(pred, raw, prob, labels)
Error:(87, 59) type mismatch;
found : Any
required: com.salesforce.op.features.FeatureLike[_ <: com.salesforce.op.features.types.FeatureType]
val workflow = new OpWorkflow().setResultFeatures(pred, raw, prob, labels)
Error:(87, 64) type mismatch;
found : Any
required: com.salesforce.op.features.FeatureLike[_ <: com.salesforce.op.features.types.FeatureType]
val workflow = new OpWorkflow().setResultFeatures(pred, raw, prob, labels)
/Users/monk/Desktop/HelloScala/src/main/scala/com/salesforce/hw/titanic/OpTitanic.scala
Error:(54, 45) not found: type Passenger
val simpleReader = DataReaders.Simple.csv[Passenger](
Error:(55, 5) not found: value schema
schema = Passenger.getClassSchema.toString, key = _.getPassengerId.toString
Error:(55, 49) not found: value key
schema = Passenger.getClassSchema.toString, key = _.getPassengerId.toString
Error:(79, 6) value setModelsToTry is not a member of com.salesforce.op.stages.impl.selector.HasRandomForestBase[E,MS]
possible cause: maybe a semicolon is missing before `value setModelsToTry'?
.setModelsToTry(LogisticRegression, RandomForest)
Error:(83, 53) type mismatch;
found : Any
required: com.salesforce.op.features.FeatureLike[_ <: com.salesforce.op.features.types.FeatureType]
val workflow = new OpWorkflow().setResultFeatures(pred, raw)
Error:(83, 59) type mismatch;
found : Any
required: com.salesforce.op.features.FeatureLike[_ <: com.salesforce.op.features.types.FeatureType]
val workflow = new OpWorkflow().setResultFeatures(pred, raw)
/Users/monk/Desktop/HelloScala/src/main/scala/com/salesforce/hw/titanic/TitanicFeatures.scala
Error:(41, 40) not found: type Passenger
val pClass = FeatureBuilder.PickList[Passenger].extract(d => Option(d.getPclass).map(_.toString).toPickList).asPredictor // scalastyle:off
Error:(43, 34) not found: type Passenger
val name = FeatureBuilder.Text[Passenger].extract(d => Option(d.getName).toText).asPredictor
Error:(45, 37) not found: type Passenger
val sex = FeatureBuilder.PickList[Passenger].extract(d => Option(d.getSex).toPickList).asPredictor
Error:(47, 33) not found: type Passenger
val age = FeatureBuilder.Real[Passenger].extract(d => Option(Double.unbox(d.getAge)).toReal).asPredictor
Error:(49, 39) not found: type Passenger
val sibSp = FeatureBuilder.PickList[Passenger].extract(d => Option(d.getSibSp).map(_.toString).toPickList).asPredictor
Error:(51, 39) not found: type Passenger
val parch = FeatureBuilder.PickList[Passenger].extract(d => Option(d.getParch).map(_.toString).toPickList).asPredictor
Error:(53, 40) not found: type Passenger
val ticket = FeatureBuilder.PickList[Passenger].extract(d => Option(d.getTicket).toPickList).asPredictor
Error:(57, 39) not found: type Passenger
val cabin = FeatureBuilder.PickList[Passenger].extract(d => Option(d.getCabin).toPickList).asPredictor
Error:(59, 42) not found: type Passenger
val embarked = FeatureBuilder.PickList[Passenger].extract(d => Option(d.getEmbarked).toPickList).asPredictor
Error:(39, 40) not found: type Passenger
val survived = FeatureBuilder.RealNN[Passenger].extract(_.getSurvived.toDouble.toRealNN).asResponse
Error:(55, 34) not found: type Passenger
val fare = FeatureBuilder.Real[Passenger].extract(d => Option(Double.unbox(d.getFare)).toReal).asPredictor
/Users/monk/Desktop/HelloScala/src/main/scala/com/salesforce/hw/titanic/OpTitanicMini.scala
Error:(40, 8) object SparkSession is not a member of package org.apache.spark.sql
import org.apache.spark.sql.SparkSession
Error:(66, 26) not found: value SparkSession
implicit val spark = SparkSession.builder.config(new SparkConf()).getOrCreate()
Error:(75, 34) value transmogrify is not a member of Any
val featureVector = features.transmogrify()
Error:(78, 36) value sanityCheck is not a member of Any
val checkedFeatures = survived.sanityCheck(featureVector, checkSample = 1.0, removeBadFeatures = true)
Error:(78, 63) not found: value checkSample
val checkedFeatures = survived.sanityCheck(featureVector, checkSample = 1.0, removeBadFeatures = true)
Error:(78, 82) not found: value removeBadFeatures
val checkedFeatures = survived.sanityCheck(featureVector, checkSample = 1.0, removeBadFeatures = true)
Error:(81, 73) too many arguments for method setInput: (features: (com.salesforce.op.features.FeatureLike[com.salesforce.op.features.types.RealNN], com.salesforce.op.features.FeatureLike[com.salesforce.op.features.types.OPVector]))com.salesforce.op.stages.impl.classification.BinaryClassificationModelSelector
val (pred, raw, prob) = BinaryClassificationModelSelector().setInput(survived, checkedFeatures).getOutput()
/Users/monk/Desktop/HelloScala/src/main/scala/com/salesforce/hw/titanic/TitanicKryoRegistrator.scala
Error:(41, 50) type Passenger is not a member of package com.salesforce.hw.titanic
doAvroRegistration[com.salesforce.hw.titanic.Passenger](kryo)
我尝试搜索这些问题，发现可能是版本问题，但我不知道如果存在版本问题，我应该使用哪个版本。 但如果我尝试从命令行运行它，它就可以工作:
cd helloworld
./gradlew compileTestScala installDist
./gradlew -q sparkSubmit -Dmain=com.salesforce.hw.OpTitanicSimple -Dargs="\
`pwd`/src/main/resources/TitanicDataset/TitanicPassengersTrainData.csv"
IntelliJ 无法正常工作，我该如何解决此问题？
最佳答案
在build.sbt中缺少两个依赖项:spark-mllib和spark-sql
libraryDependencies ++= Seq(
"org.apache.spark" %% "spark-core" % "2.3.1",
"org.apache.spark" %% "spark-mllib" % "2.3.1",
"org.apache.spark" %% "spark-sql" % "2.3.1",
"com.salesforce.transmogrifai" %% "transmogrifai-core" % "0.3.4"
)
这将删除第一 block 错误。
关于java - 如何使用 IntelliJ 解决 Scala 中的异常？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/52252621/