【发布时间】：2017-01-20 23:02:43
【问题描述】：
我已报名参加 Scala 函数式编程 Coursera 课程，并完成了遇到此问题的初始设置练习。
尝试通过 Intellij IDEA 的终端编译“Hello world”SBT 项目时出现此错误
[error] while compiling: /home/vgorcinschi/Documents/ideaProjects/CourseraScalaOne/example/src/main/scala/example/ExampleApp.scala
[error] during phase: typer
[error] library version: version 2.10.4
[error] compiler version: version 2.10.4
还有更多内容，但问题的核心在于 - 在 build.sbt 中，scalac 设置为 2.10.4 (and everything 2.10.4 and less is not competible with Java 8)，我将其设置为 2.12.1：
name := "example"
version := "1.0"
scalaVersion := "2.12.1"
libraryDependencies += "org.scalactic" %% "scalactic" % "3.0.1"
libraryDependencies += "org.scalatest" %% "scalatest" % "3.0.1" % "test"
libraryDependencies ++= Seq(
"org.scala-lang.modules" % "scala-xml_2.12" % "1.0.6",
"org.scala-lang" % "scala-reflect" % "2.12.1",
"org.scala-lang" % "scala-library" % "2.12.1"
)
这是类路径上的版本：
但是，即使在项目根目录的终端中尝试简单的 scala -version 我使用的是旧版本：
[vgorcinschi@localhost example]$ scala -version
Scala code runner version 2.10.4 -- Copyright 2002-2013, LAMP/EPFL
[vgorcinschi@localhost example]$
我将 Scala 设置为一个新的位置，但这并没有帮助：
[vgorcinschi@localhost ~]$ echo $SCALA_HOME
/usr/local/scala-2.11.8/
我正在开发 Fedora 24。有关如何在我的操作系统上更改 scala、scalac、scalap 位置的任何帮助都会有所帮助，否则我如何确保在项目中使用正确的 scala 版本？
请注意，我尝试使用 this advice 更改 scala 位置，但也没有用：
[vgorcinschi@localhost ~]$ sudo ln -s /usr/bin/scala /usr/local/scala-2.11.8/bin/scala
[sudo] password for vgorcinschi:
ln: failed to create symbolic link '/usr/local/scala-2.11.8/bin/scala': File exists
更新
这是完整的堆栈跟踪（用 'last compile: compile 调用）：
[debug]
[debug] Initial source changes:
[debug] removed:Set()
[debug] added: Set(/home/vgorcinschi/Documents/ideaProjects/CourseraScalaOne/example/src/main/scala/example/ExampleApp.scala)
[debug] modified: Set()
[debug] Removed products: Set()
[debug] Modified external sources: Set()
[debug] Modified binary dependencies: Set()
[debug] Initial directly invalidated sources: Set(/home/vgorcinschi/Documents/ideaProjects/CourseraScalaOne/example/src/main/scala/example/ExampleApp.scala)
[debug]
[debug] Sources indirectly invalidated by:
[debug] product: Set()
[debug] binary dep: Set()
[debug] external source: Set()
[debug] All initially invalidated sources: Set(/home/vgorcinschi/Documents/ideaProjects/CourseraScalaOne/example/src/main/scala/example/ExampleApp.scala)
[debug] Recompiling all 1 sources: invalidated sources (1) exceeded 50.0% of all sources
[info] Compiling 1 Scala source to /home/vgorcinschi/Documents/ideaProjects/CourseraScalaOne/example/target/scala-2.12/classes...
[debug] Getting compiler-interface from component compiler for Scala 2.12.1
[debug] Getting compiler-interface from component compiler for Scala 2.12.1
[debug] Running cached compiler 6bac1d44, interfacing (CompilerInterface) with Scala compiler version 2.10.4
[debug] Calling Scala compiler with arguments (CompilerInterface):
[debug] -bootclasspath
[debug] /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.111-5.b16.fc24.x86_64/jre/lib/resources.jar:/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.111-5.b16.fc24.x86_64/jre/lib/rt.jar:/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.111-5.b16.fc24.x86_64/jre/lib/sunrsasign.jar:/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.111-5.b16.fc24.x86_64/jre/lib/jsse.jar:/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.111-5.b16.fc24.x86_64/jre/lib/jce.jar:/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.111-5.b16.fc24.x86_64/jre/lib/charsets.jar:/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.111-5.b16.fc24.x86_64/jre/lib/jfr.jar:/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.111-5.b16.fc24.x86_64/jre/classes:/home/vgorcinschi/.ivy2/cache/org.scala-lang/scala-library/jars/scala-library-2.12.1.jar
[debug] -classpath
[debug] /home/vgorcinschi/Documents/ideaProjects/CourseraScalaOne/example/target/scala-2.12/classes:/home/vgorcinschi/.ivy2/cache/org.scalactic/scalactic_2.12/bundles/scalactic_2.12-3.0.1.jar:/home/vgorcinschi/.ivy2/cache/org.scala-lang/scala-reflect/jars/scala-reflect-2.12.1.jar:/home/vgorcinschi/.ivy2/cache/org.scala-lang.modules/scala-xml_2.12/bundles/scala-xml_2.12-1.0.6.jar
[error]
[error] while compiling: /home/vgorcinschi/Documents/ideaProjects/CourseraScalaOne/example/src/main/scala/example/ExampleApp.scala
[error] during phase: typer
[error] library version: version 2.10.4
[error] compiler version: version 2.10.4
[error] reconstructed args: -bootclasspath /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.111-5.b16.fc24.x86_64/jre/lib/resources.jar:/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.111-5.b16.fc24.x86_64/jre/lib/rt.jar:/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.111-5.b16.fc24.x86_64/jre/lib/sunrsasign.jar:/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.111-5.b16.fc24.x86_64/jre/lib/jsse.jar:/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.111-5.b16.fc24.x86_64/jre/lib/jce.jar:/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.111-5.b16.fc24.x86_64/jre/lib/charsets.jar:/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.111-5.b16.fc24.x86_64/jre/lib/jfr.jar:/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.111-5.b16.fc24.x86_64/jre/classes:/home/vgorcinschi/.ivy2/cache/org.scala-lang/scala-library/jars/scala-library-2.12.1.jar -classpath /home/vgorcinschi/Documents/ideaProjects/CourseraScalaOne/example/target/scala-2.12/classes:/home/vgorcinschi/.ivy2/cache/org.scalactic/scalactic_2.12/bundles/scalactic_2.12-3.0.1.jar:/home/vgorcinschi/.ivy2/cache/org.scala-lang/scala-reflect/jars/scala-reflect-2.12.1.jar:/home/vgorcinschi/.ivy2/cache/org.scala-lang.modules/scala-xml_2.12/bundles/scala-xml_2.12-1.0.6.jar
[error]
[error] last tree to typer: Literal(Constant(Hello, world!))
[error] symbol: null
[error] symbol definition: null
[error] tpe: String("Hello, world!")
[error] symbol owners:
[error] context owners: value <local ExampleApp> -> object ExampleApp -> package example
[error]
[error] == Enclosing template or block ==
[error]
[error] Template( // val <local ExampleApp>: <notype> in object ExampleApp
[error] "App" // parents
[error] ValDef(
[error] private
[error] "_"
[error] <tpt>
[error] <empty>
[error] )
[error] // 2 statements
[error] DefDef( // def <init>(): example.ExampleApp.type in object ExampleApp
[error] <method>
[error] "<init>"
[error] []
[error] List(Nil)
[error] <tpt> // tree.tpe=example.ExampleApp.type
[error] Block( // tree.tpe=Unit
[error] Apply( // def <init>(): Object in class Object, tree.tpe=Object
[error] ExampleApp.super."<init>" // def <init>(): Object in class Object, tree.tpe=()Object
[error] Nil
[error] )
[error] ()
[error] )
[error] )
[error] Apply(
[error] "println"
[error] "Hello, world!"
[error] )
[error] )
[error]
[error] == Expanded type of tree ==
[error]
[error] ConstantType(value = Constant(Hello, world!))
[error]
[error] uncaught exception during compilation: scala.reflect.internal.MissingRequirementError
scala.reflect.internal.MissingRequirementError: class scala.annotation.serializable in compiler mirror not found.
at scala.reflect.internal.MissingRequirementError$.signal(MissingRequirementError.scala:16)
at scala.reflect.internal.MissingRequirementError$.notFound(MissingRequirementError.scala:17)
at scala.reflect.internal.Mirrors$RootsBase$$anonfun$getModuleOrClass$3.apply(Mirrors.scala:49)
at scala.reflect.internal.Mirrors$RootsBase$$anonfun$getModuleOrClass$3.apply(Mirrors.scala:49)
at scala.reflect.internal.Symbols$Symbol.orElse(Symbols.scala:2229)
at scala.reflect.internal.Mirrors$RootsBase.getModuleOrClass(Mirrors.scala:48)
at scala.reflect.internal.Mirrors$RootsBase.getModuleOrClass(Mirrors.scala:61)
at scala.reflect.internal.Mirrors$RootsBase.getClassByName(Mirrors.scala:99)
at scala.reflect.internal.Mirrors$RootsBase.getRequiredClass(Mirrors.scala:102)
at scala.reflect.internal.Mirrors$RootsBase.requiredClass(Mirrors.scala:105)
at scala.reflect.internal.Definitions$DefinitionsClass.SerializableAttr$lzycompute(Definitions.scala:962)
at scala.reflect.internal.Definitions$DefinitionsClass.SerializableAttr(Definitions.scala:962)
at scala.reflect.internal.Symbols$Symbol.isSerializable(Symbols.scala:720)
at scala.tools.nsc.typechecker.SyntheticMethods$class.needsReadResolve$1(SyntheticMethods.scala:324)
at scala.tools.nsc.typechecker.SyntheticMethods$class.extras$1(SyntheticMethods.scala:357)
at scala.tools.nsc.typechecker.SyntheticMethods$class.synthesize$1(SyntheticMethods.scala:367)
at scala.tools.nsc.typechecker.SyntheticMethods$$anonfun$addSyntheticMethods$2.apply(SyntheticMethods.scala:400)
at scala.tools.nsc.typechecker.SyntheticMethods$$anonfun$addSyntheticMethods$2.apply(SyntheticMethods.scala:398)
at scala.reflect.internal.Trees$class.deriveTemplate(Trees.scala:1610)
at scala.reflect.internal.SymbolTable.deriveTemplate(SymbolTable.scala:13)
at scala.tools.nsc.typechecker.SyntheticMethods$class.addSyntheticMethods(SyntheticMethods.scala:398)
at scala.tools.nsc.Global$$anon$1.addSyntheticMethods(Global.scala:493)
at scala.tools.nsc.typechecker.Typers$Typer.finishMethodSynthesis(Typers.scala:1848)
at scala.tools.nsc.typechecker.Typers$Typer.typedModuleDef(Typers.scala:1810)
at scala.tools.nsc.typechecker.Typers$Typer.typed1(Typers.scala:5584)
at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:5642)
at scala.tools.nsc.typechecker.Typers$Typer.scala$tools$nsc$typechecker$Typers$Typer$$typedStat$1(Typers.scala:2928)
at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$61.apply(Typers.scala:3032)
at scala.tools.nsc.typechecker.Typers$Typer$$anonfun$61.apply(Typers.scala:3032)
at scala.collection.immutable.List.loop$1(List.scala:170)
at scala.collection.immutable.List.mapConserve(List.scala:186)
at scala.tools.nsc.typechecker.Typers$Typer.typedStats(Typers.scala:3032)
at scala.tools.nsc.typechecker.Typers$Typer.typedPackageDef$1(Typers.scala:5301)
at scala.tools.nsc.typechecker.Typers$Typer.typed1(Typers.scala:5587)
at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:5642)
at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:5704)
at scala.tools.nsc.typechecker.Analyzer$typerFactory$$anon$3.apply(Analyzer.scala:99)
at scala.tools.nsc.Global$GlobalPhase.applyPhase(Global.scala:464)
at scala.tools.nsc.typechecker.Analyzer$typerFactory$$anon$3$$anonfun$run$1.apply(Analyzer.scala:91)
at scala.tools.nsc.typechecker.Analyzer$typerFactory$$anon$3$$anonfun$run$1.apply(Analyzer.scala:91)
at scala.collection.Iterator$class.foreach(Iterator.scala:727)
at scala.collection.AbstractIterator.foreach(Iterator.scala:1157)
at scala.tools.nsc.typechecker.Analyzer$typerFactory$$anon$3.run(Analyzer.scala:91)
at scala.tools.nsc.Global$Run.compileUnitsInternal(Global.scala:1583)
at scala.tools.nsc.Global$Run.compileUnits(Global.scala:1557)
at scala.tools.nsc.Global$Run.compileSources(Global.scala:1553)
at scala.tools.nsc.Global$Run.compile(Global.scala:1662)
at xsbt.CachedCompiler0.run(CompilerInterface.scala:123)
at xsbt.CachedCompiler0.run(CompilerInterface.scala:99)
at xsbt.CompilerInterface.run(CompilerInterface.scala:27)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sbt.compiler.AnalyzingCompiler.call(AnalyzingCompiler.scala:102)
at sbt.compiler.AnalyzingCompiler.compile(AnalyzingCompiler.scala:48)
at sbt.compiler.AnalyzingCompiler.compile(AnalyzingCompiler.scala:41)
at sbt.compiler.AggressiveCompile$$anonfun$3$$anonfun$compileScala$1$1.apply$mcV$sp(AggressiveCompile.scala:98)
at sbt.compiler.AggressiveCompile$$anonfun$3$$anonfun$compileScala$1$1.apply(AggressiveCompile.scala:98)
at sbt.compiler.AggressiveCompile$$anonfun$3$$anonfun$compileScala$1$1.apply(AggressiveCompile.scala:98)
at sbt.compiler.AggressiveCompile.sbt$compiler$AggressiveCompile$$timed(AggressiveCompile.scala:159)
at sbt.compiler.AggressiveCompile$$anonfun$3.compileScala$1(AggressiveCompile.scala:97)
at sbt.compiler.AggressiveCompile$$anonfun$3.apply(AggressiveCompile.scala:142)
at sbt.compiler.AggressiveCompile$$anonfun$3.apply(AggressiveCompile.scala:86)
at sbt.inc.IncrementalCompile$$anonfun$doCompile$1.apply(Compile.scala:38)
at sbt.inc.IncrementalCompile$$anonfun$doCompile$1.apply(Compile.scala:36)
at sbt.inc.Incremental$.cycle(Incremental.scala:73)
at sbt.inc.Incremental$$anonfun$1.apply(Incremental.scala:33)
at sbt.inc.Incremental$$anonfun$1.apply(Incremental.scala:32)
at sbt.inc.Incremental$.manageClassfiles(Incremental.scala:41)
at sbt.inc.Incremental$.compile(Incremental.scala:32)
at sbt.inc.IncrementalCompile$.apply(Compile.scala:26)
at sbt.compiler.AggressiveCompile.compile2(AggressiveCompile.scala:150)
at sbt.compiler.AggressiveCompile.compile1(AggressiveCompile.scala:70)
at sbt.compiler.AggressiveCompile.apply(AggressiveCompile.scala:45)
at sbt.Compiler$.apply(Compiler.scala:70)
at sbt.Defaults$.sbt$Defaults$$compileTaskImpl(Defaults.scala:736)
at sbt.Defaults$$anonfun$compileTask$1.apply(Defaults.scala:730)
at sbt.Defaults$$anonfun$compileTask$1.apply(Defaults.scala:730)
at scala.Function1$$anonfun$compose$1.apply(Function1.scala:47)
at sbt.$tilde$greater$$anonfun$$u2219$1.apply(TypeFunctions.scala:42)
at sbt.std.Transform$$anon$4.work(System.scala:64)
at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:237)
at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:237)
at sbt.ErrorHandling$.wideConvert(ErrorHandling.scala:18)
at sbt.Execute.work(Execute.scala:244)
at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:237)
at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:237)
at sbt.ConcurrentRestrictions$$anon$4$$anonfun$1.apply(ConcurrentRestrictions.scala:160)
at sbt.CompletionService$$anon$2.call(CompletionService.scala:30)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.Executors$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] (compile:compile) scala.reflect.internal.MissingRequirementError: class scala.annotation.serializable in compiler mirror not found.
【问题讨论】：
-
您可以通过
sbt运行所有内容。如果您希望 REPL 使用scala，请尝试使用sbt console。这将获取您的构建设置。 -
它没有选择构建版本 - 完全相同的错误
-
如果你
cd到带有build.sbt的目录并运行sbt console它会给你一个 scala 版本而不是build.sbt中指定的版本？ -
是的，这就是它给我的：-“编译器版本：版本 2.10.4”可能是因为我的 /home/username/ 目录中有 .sbt 和 .ivy2？
-
我们可以看看你的
build.sbt吗？您还使用了错误的命令ls而不是ln。
标签： scala intellij-idea sbt fedora