未找到编译器镜像中的对象 scala - 以编程方式运行 Scala 编译器
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object scala in compiler mirror not found - running Scala compiler programmatically
提问by adelbertc
Running w/ a simple SBT project w/ Java 7 (details below) and invoking sbt runat the command line (no IntelliJ or anything)
使用 Java 7 运行一个简单的 SBT 项目（详细信息如下）并sbt run在命令行调用（没有 IntelliJ 或任何东西）
source
来源
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)
}
error
错误
error: error while loading Object, Missing dependency 'object scala in compiler mirror', required by /Library/Java/JavaVirtualMachines/jdk1.7.0_60.jdk/Contents/Home/jre/lib/rt.jar(java/lang/Object.class)
[error] (run-main-0) scala.reflect.internal.MissingRequirementError: object scala in compiler mirror not found.
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:1388)
at scala.tools.nsc.Global$Run.<init>(Global.scala:1053)
<etc...>
build.sbt
生成.sbt
scalaVersion := "2.11.4"
val scalaV = "2.11.4"
libraryDependencies ++= Seq(
"org.scala-lang" % "scala-compiler" % scalaV,
"org.scala-lang" % "scala-library" % scalaV,
"org.scala-lang" % "scala-reflect" % scalaV
)
java
爪哇
$ java -version
java version "1.7.0_60-ea"
Java(TM) SE Runtime Environment (build 1.7.0_60-ea-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.60-b09, mixed mode)
采纳答案by som-snytt
This is the one where you have to say:
这是你必须说的：
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)
}
That took me a couple of minutes. That method name, "embeddedDefaults", is as cryptic as any to come out of sbt.
这花了我几分钟。该方法名称“embeddedDefaults”与 sbt 中的任何名称一样神秘。
The comment on MutableSettings(which suggests a side effect):
评论MutableSettings（暗示有副作用）：
/** Initializes these settings for embedded use by type `T`.
* The class loader defining `T` should provide resources `app.class.path`
* and `boot.class.path`. These resources should contain the application
* and boot classpaths in the same form as would be passed on the command line.*/
The indentation is as in the source code.
缩进与源代码中的一样。
回答by Thamme Gowda
I hit the same problem.
我遇到了同样的问题。
settings.usejavacp.value = true
solved the problem for me!
为我解决了问题！
回答by ozma
@som-snytt solution worked for me on a clean sbt project. It didn't work on an akka-http project. this is the manual solution I've found (hardcoded path. One should adjust it to his env or put it in conf file)
@som-snytt 解决方案在一个干净的 sbt 项目中对我来说有效。它不适用于 akka-http 项目。这是我找到的手动解决方案（硬编码路径。应该将其调整为他的 env 或将其放入 conf 文件中）
It is just telling the compiler where to find scala libs for compilation
它只是告诉编译器在哪里可以找到用于编译的 Scala 库
val settings = new Settings()
//didn't need this one:// settings.embeddedDefaults[Probe]
settings.classpath.value = "/home/oz/.ivy2/cache/org.scala-lang/scala-compiler/jars/scala-compiler-2.11.8.jar:/home/oz/.ivy2/cache/org.scala-lang/scala-library/jars/scala-library-2.11.8.jar:/home/oz/.ivy2/cache/org.scala-lang/scala-reflect/jars/scala-reflect-2.11.8.jar:/home/oz/.ivy2/cache/org.scala-lang.modules/scala-xml_2.11/bundles/scala-xml_2.11-1.0.4.jar:/home/oz/.ivy2/cache/org.scala-lang.modules/scala-parser-combinators_2.11/bundles/scala-parser-combinators_2.11-1.0.4.jar"
settings.bootclasspath append "/home/oz/.ivy2/cache/org.scala-lang/scala-library/jars/scala-library-2.11.8.jar:/home/oz/.ivy2/cache/org.scala-lang/scala-compiler/jars/scala-compiler-2.11.8.jar:/home/oz/.ivy2/cache/org.scala-lang/scala-reflect/jars/scala-reflect-2.11.8.jar:/home/oz/.ivy2/cache/org.scala-lang.modules/scala-xml_2.11/bundles/scala-xml_2.11-1.0.4.jar:/home/oz/.ivy2/cache/org.scala-lang.modules/scala-parser-combinators_2.11/bundles/scala-parser-combinators_2.11-1.0.4.jar:/home/oz/.ivy2/cache/jline/jline/jars/jline-2.12.1.jar"
回答by geektcp
I resole it, beacuse the maven dependence error:
我重新解决了，因为maven依赖错误：
<dependency>
<groupId>com.haizhi.spark</groupId>
<artifactId>spark-assembly</artifactId>
<version>1.6.1</version>
</dependency>
I remove this dependency, and then successful!!
我去掉这个依赖，然后成功！！
