java.lang.NoSuchMethodError: scala.Predef$.refArrayOps
java.lang.NoSuchMethodError: scala.Predef$.refArrayOps
提问于 2016-10-30 20:16:37
我有以下类：
import scala.util.{Success, Failure, Try}
class MyClass {
def openFile(fileName: String): Try[String] = {
Failure( new Exception("some message"))
}
def main(args: Array[String]): Unit = {
openFile(args.head)
}
}它有以下单元测试：
class MyClassTest extends org.scalatest.FunSuite {
test("pass inexistent file name") {
val myClass = new MyClass()
assert(myClass.openFile("./noFile").failed.get.getMessage == "Invalid file name")
}
}当我运行sbt test时，我得到以下错误：
java.lang.NoSuchMethodError: scala.Predef$.refArrayOps([Ljava/lang/Object;)Lscala/collection/mutable/ArrayOps;
at org.scalatest.tools.FriendlyParamsTranslator$.translateArguments(FriendlyParamsTranslator.scala:174)
at org.scalatest.tools.Framework.runner(Framework.scala:918)
at sbt.Defaults$$anonfun$createTestRunners$1.apply(Defaults.scala:533)
at sbt.Defaults$$anonfun$createTestRunners$1.apply(Defaults.scala:527)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
at scala.collection.immutable.Map$Map1.foreach(Map.scala:109)
at scala.collection.TraversableLike$class.map(TraversableLike.scala:244)
at scala.collection.AbstractTraversable.map(Traversable.scala:105)
at sbt.Defaults$.createTestRunners(Defaults.scala:527)
at sbt.Defaults$.allTestGroupsTask(Defaults.scala:543)
at sbt.Defaults$$anonfun$testTasks$4.apply(Defaults.scala:410)
at sbt.Defaults$$anonfun$testTasks$4.apply(Defaults.scala:410)
at scala.Function8$$anonfun$tupled$1.apply(Function8.scala:35)
at scala.Function8$$anonfun$tupled$1.apply(Function8.scala:34)
at scala.Function1$$anonfun$compose$1.apply(Function1.scala:47)
at sbt.$tilde$greater$$anonfun$$u2219$1.apply(TypeFunctions.scala:40)
at sbt.std.Transform$$anon$4.work(System.scala:63)
at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:226)
at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:226)
at sbt.ErrorHandling$.wideConvert(ErrorHandling.scala:17)
at sbt.Execute.work(Execute.scala:235)
at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:226)
at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:226)
at sbt.ConcurrentRestrictions$$anon$4$$anonfun$1.apply(ConcurrentRestrictions.scala:159)
at sbt.CompletionService$$anon$2.call(CompletionService.scala:28)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
[error] (test:executeTests) java.lang.NoSuchMethodError: scala.Predef$.refArrayOps([Ljava/lang/Object;)Lscala/collection/mutable/ArrayOps;构建定义：
version := "1.0"
scalaVersion := "2.12.0"
// https://mvnrepository.com/artifact/org.scalatest/scalatest_2.11
libraryDependencies += "org.scalatest" % "scalatest_2.11" % "3.0.0"我不知道这是什么原因。我的类和单元测试看起来很简单。有什么想法吗？
回答 8
Stack Overflow用户
回答已采纳
发布于 2016-10-30 22:15:53
scalatest_2.11是只与Scala2.11.x兼容的ScalaTest版本。改为编写libraryDependencies += "org.scalatest" %% "scalatest" % "3.0.0" % "test" (注意%%)以自动选择正确的版本，并切换到Scala 2.11.8，直到scalatest_2.12发布(应该很快就会发布)。有关详细信息，请参阅http://www.scala-sbt.org/0.13/docs/Cross-Build.html。
Stack Overflow用户
发布于 2017-05-18 05:35:16
我使用了IntelliJ，然后再次导入项目。我的意思是，关闭打开的项目并导入为Maven或SBT。注意:我选择了mvn (自动导入Maven项目)它就消失了。
Stack Overflow用户
发布于 2017-03-21 14:05:34
根据我的经验，如果在build.sbt中匹配scalatest版本和scala版本后仍然出现错误，则必须考虑在您的机器上运行的实际scala版本。你可以通过$ scala查看它，查看
Welcome to Scala 2.12.1 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_121). Type in expressions for evaluation. Or try :help.此类型的消息。您需要匹配此Scala版本(例如，这里是2.12.1 )和build.sbt的。
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原文链接：
https://stackoverflow.com/questions/40328948
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