自定義Scala REPL問題

我正在嘗試使用我在各種網站上發現的一些信息編寫一個基本的Scala REPL。我最基本的REPL實施看起來是這樣的，自定義Scala REPL問題

import scala.tools.nsc.Settings 
import scala.tools.nsc.interpreter._ 

object BillyREPL extends App { 
    val settings = new Settings 
    settings.usejavacp.value = true 
    settings.deprecation.value = true 

    new ILoop().process(settings) 
}

用下面的構建設置，

import sbt._ 
import sbt.Keys._ 

object BillyREPLBuild extends Build { 

    lazy val billyrepl = Project(
    id = "billyrepl", 
    base = file("."), 
    settings = Project.defaultSettings ++ Seq(
     name := "BillyREPL", 
     organization := "tv.yobriefcasts", 
     version := "0.1-SNAPSHOT", 
     scalaVersion := "2.10.1", 
     libraryDependencies ++= Seq(
     "org.scala-lang" % "scala-compiler" % "2.10.1", 
     "org.scala-lang" % "scala-library" % "2.10.1" 
    ) 
    ) 
) 
}

嘗試運行然而，這導致了一些警告和最終的錯誤（這我相信由最初所引起警告），

Welcome to Scala version 2.10.1 (Java HotSpot(TM) 64-Bit Server VM, Java 1.7.0_12-ea). 
Type in expressions to have them evaluated. 
Type :help for more information. 

scala> 
Failed to initialize compiler: object scala.annotation.Annotation in compiler mirror not found. 
** Note that as of 2.8 scala does not assume use of the java classpath. 
** For the old behavior pass -usejavacp to scala, or if using a Settings 
** object programatically, settings.usejavacp.value = true.

而試圖讀取/評估ANYING時的錯誤如下。我不確定這是否是由於一些額外的缺失依賴，並且我意識到錯誤消息表明這是不常見的，但是我想知道如果有人之前曾經處理過這個問題，是否在我打開問題之前？

2 

Failed to initialize the REPL due to an unexpected error. 
This is a bug, please, report it along with the error diagnostics printed below. 
java.lang.NullPointerException 
    at scala.tools.nsc.interpreter.ExprTyper$codeParser$.applyRule(ExprTyper.scala:24) 
    at scala.tools.nsc.interpreter.ExprTyper$codeParser$.stmts(ExprTyper.scala:35) 
    at scala.tools.nsc.interpreter.ExprTyper$$anonfun$parse$2.apply(ExprTyper.scala:43) 
    at scala.tools.nsc.interpreter.ExprTyper$$anonfun$parse$2.apply(ExprTyper.scala:42) 
    at scala.tools.nsc.reporters.Reporter.withIncompleteHandler(Reporter.scala:51) 
    at scala.tools.nsc.interpreter.ExprTyper$class.parse(ExprTyper.scala:42) 
    at scala.tools.nsc.interpreter.IMain$exprTyper$.parse(IMain.scala:1074) 
    at scala.tools.nsc.interpreter.IMain.parse(IMain.scala:1078) 
    at scala.tools.nsc.interpreter.IMain$$anonfun$showCodeIfDebugging$1.apply(IMain.scala:1168) 
    at scala.tools.nsc.interpreter.IMain$$anonfun$showCodeIfDebugging$1.apply(IMain.scala:1168) 
    at scala.tools.nsc.interpreter.IMain.beSilentDuring(IMain.scala:238) 
    at scala.tools.nsc.interpreter.IMain.showCodeIfDebugging(IMain.scala:1168) 
    at scala.tools.nsc.interpreter.IMain$ReadEvalPrint.compileAndSaveRun(IMain.scala:800) 
    at scala.tools.nsc.interpreter.IMain$ReadEvalPrint.compile(IMain.scala:761) 
    at scala.tools.nsc.interpreter.IMain.bind(IMain.scala:618) 
    at scala.tools.nsc.interpreter.IMain.bind(IMain.scala:661) 
    at scala.tools.nsc.interpreter.IMain$$anonfun$quietBind$1.apply(IMain.scala:660) 
    at scala.tools.nsc.interpreter.IMain$$anonfun$quietBind$1.apply(IMain.scala:660) 
    at scala.tools.nsc.interpreter.IMain.beQuietDuring(IMain.scala:232) 
    at scala.tools.nsc.interpreter.IMain.quietBind(IMain.scala:660) 
    at scala.tools.nsc.interpreter.ILoop$$anonfun$process$1$$anonfun$apply$mcZ$sp$2.apply$mcV$sp(ILoop.scala:838) 
    at scala.tools.nsc.interpreter.ILoopInit$class.runThunks(ILoopInit.scala:122) 
    at scala.tools.nsc.interpreter.ILoop.runThunks(ILoop.scala:42) 
    at scala.tools.nsc.interpreter.ILoopInit$class.postInitialization(ILoopInit.scala:95) 
    at scala.tools.nsc.interpreter.ILoop.postInitialization(ILoop.scala:42) 
    at scala.tools.nsc.interpreter.ILoopInit$$anonfun$createAsyncListener$1.apply$mcV$sp(ILoopInit.scala:63) 
    at scala.tools.nsc.interpreter.ILoopInit$$anonfun$createAsyncListener$1.apply(ILoopInit.scala:60) 
    at scala.tools.nsc.interpreter.ILoopInit$$anonfun$createAsyncListener$1.apply(ILoopInit.scala:60) 
    at scala.tools.nsc.io.package$$anon$3.call(package.scala:40) 
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) 
    at java.util.concurrent.FutureTask.run(FutureTask.java:166) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) 
    at java.lang.Thread.run(Thread.java:722) 
.

來源

2013-06-04 James Hughes

是否經由'SBT開始你的項目run'，因爲推出定製來自sbt的口譯員不工作AFAIK。如果是這種情況，請嘗試使用sbt-assembly構建獨立程序，並查看是否正確啓動。 –

啊，就是這樣。你想發佈這個答案，所以我可以接受它嗎？ –