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[编辑：添加评论中要求的精​​度]

我正在尝试以编程方式运行编译器并得到“缺少依赖项'编译器镜像中的对象 scala'”错误。我在编译器镜像中找不到这个帖子对象 scala - 以编程方式运行 Scala 编译器（但它只解释了如果我们从 sbt 而不是从外部启动程序时如何解决问题）。

所以我在这里复制/粘贴示例：

import scala.tools.nsc.{ Global, Settings }

object Playground extends App {
  val compiler = new Global(new Settings())
  val testFiles = List("Test.scala")
  val runner = new compiler.Run()
  val result = runner.compile(testFiles)
  println(result)
}

以及从 SBT 启动时使其工作的解决方案：

trait Probe

object Playground extends App {
  //val compiler = new Global(new Settings())
  val s = new Settings()
  s.embeddedDefaults[Probe]
  val compiler = new Global(s)
  val testFiles = List("Test.scala")
  val runner = new compiler.Run()
  val result = runner.compile(testFiles)
  println(result)
}

我正在尝试通过将来自 sbt 的 fullClassPath 值作为类路径传递来直接从终端启动这两个版本：

java -cp /home/lorilan/path-to-my-project/target/scala-2.11/classes:/home/lorilan/.ivy2/c‌​ache/org.scala-lang/scala-compiler/jars/scala-compiler-2.11.6.jar:/home/lorilan/.‌​ivy2/cache/org.scala-lang/scala-library/jars/scala-library-2.11.6.jar:/home/loril‌​an/.ivy2/cache/org.scala-lang/scala-reflect/jars/scala-reflect-2.11.6.jar p.Playground

java -version 在哪里给出

java version "1.7.0_79" 
OpenJDK Runtime Environment (IcedTea 2.5.5) (Arch Linux build 7.u79_2.5.5-1-x86_64)
OpenJDK 64-Bit Server VM (build 24.79-b02, mixed mode)

每次我收到以下错误：

error: error while loading Object, Missing dependency 'object scala in compiler mirror', required by /usr/lib/jvm/java-7-openjdk/jre/lib/rt.jar(java/lang/Object.class)
Exception in thread "main" scala.reflect.internal.MissingRequirementError: object scala in compiler mirror not found.
at scala.reflect.internal.MissingRequirementError$.signal(MissingRequirementError.scala:17)
at scala.reflect.internal.MissingRequirementError$.notFound(MissingRequirementError.scala:18)
at scala.reflect.internal.Mirrors$RootsBase.getModuleOrClass(Mirrors.scala:53)
at scala.reflect.internal.Mirrors$RootsBase.getModuleOrClass(Mirrors.scala:66)
at scala.reflect.internal.Mirrors$RootsBase.getPackage(Mirrors.scala:173)
at scala.reflect.internal.Definitions$DefinitionsClass.ScalaPackage$lzycompute(Definitions.scala:161)
at scala.reflect.internal.Definitions$DefinitionsClass.ScalaPackage(Definitions.scala:161)
at scala.reflect.internal.Definitions$DefinitionsClass.ScalaPackageClass$lzycompute(Definitions.scala:162)
at scala.reflect.internal.Definitions$DefinitionsClass.ScalaPackageClass(Definitions.scala:162)
at scala.reflect.internal.Definitions$DefinitionsClass.init(Definitions.scala:1392)
at scala.tools.nsc.Global$Run.<init>(Global.scala:1216)
at puck.Playground$.main(Playground.scala:15)
at puck.Playground.main(Playground.scala)

所以我的问题是双重的：

  • 有人可以向我解释上述帖子中显示的“魔术”是如何工作的吗？（我没有得到 embeddedDefaults 方法的注释）

  • 有人可以给出一个同样神奇的技巧来从终端运行操场吗？

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