java - MSys2 下的 Scala - 无法初始化终端

Question

我的环境是最新的 Windows 10 x64/Scala 2.11.7/Msys2。

从 MSys2 控制台运行 Scala 时，我看到以下内容:

$ scala
[ERROR] Terminal initialization failed; falling back to unsupported
java.lang.NoClassDefFoundError: Could not initialize class org.fusesource.jansi.internal.Kernel32
    at org.fusesource.jansi.internal.WindowsSupport.getConsoleMode(WindowsSupport.java:50)
    at jline.WindowsTerminal.getConsoleMode(WindowsTerminal.java:204)
    at jline.WindowsTerminal.init(WindowsTerminal.java:82)
    at jline.TerminalFactory.create(TerminalFactory.java:101)
    at jline.TerminalFactory.get(TerminalFactory.java:158)
    at jline.console.ConsoleReader.<init>(ConsoleReader.java:229)
    at jline.console.ConsoleReader.<init>(ConsoleReader.java:221)
    at jline.console.ConsoleReader.<init>(ConsoleReader.java:209)
    at scala.tools.nsc.interpreter.jline.JLineConsoleReader.<init>(JLineReader.scala:61)
    at scala.tools.nsc.interpreter.jline.InteractiveReader.<init>(JLineReader.scala:33)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
    at scala.tools.nsc.interpreter.ILoop$$anonfun$scala$tools$nsc$interpreter$ILoop$$instantiate$1$1.apply(ILoop.scala:865)
    at scala.tools.nsc.interpreter.ILoop$$anonfun$scala$tools$nsc$interpreter$ILoop$$instantiate$1$1.apply(ILoop.scala:862)
    at scala.tools.nsc.interpreter.ILoop.scala$tools$nsc$interpreter$ILoop$$mkReader$1(ILoop.scala:871)
    at scala.tools.nsc.interpreter.ILoop$$anonfun$15$$anonfun$apply$8.apply(ILoop.scala:875)
    at scala.tools.nsc.interpreter.ILoop$$anonfun$15$$anonfun$apply$8.apply(ILoop.scala:875)
    at scala.util.Try$.apply(Try.scala:192)
    at scala.tools.nsc.interpreter.ILoop$$anonfun$15.apply(ILoop.scala:875)
    at scala.tools.nsc.interpreter.ILoop$$anonfun$15.apply(ILoop.scala:875)
    at scala.collection.immutable.Stream.map(Stream.scala:418)
    at scala.tools.nsc.interpreter.ILoop.chooseReader(ILoop.scala:875)
    at scala.tools.nsc.interpreter.ILoop$$anonfun$process$1$$anonfun$apply$mcZ$sp$2.apply(ILoop.scala:916)
    at scala.tools.nsc.interpreter.ILoop$$anonfun$process$1.apply$mcZ$sp(ILoop.scala:916)
    at scala.tools.nsc.interpreter.ILoop$$anonfun$process$1.apply(ILoop.scala:911)
    at scala.tools.nsc.interpreter.ILoop$$anonfun$process$1.apply(ILoop.scala:911)
    at scala.reflect.internal.util.ScalaClassLoader$.savingContextLoader(ScalaClassLoader.scala:97)
    at scala.tools.nsc.interpreter.ILoop.process(ILoop.scala:911)
    at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:74)
    at scala.tools.nsc.MainGenericRunner.run$1(MainGenericRunner.scala:87)
    at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:98)
    at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:103)
    at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)

Welcome to Scala version 2.11.7 (Java HotSpot(TM) 64-Bit Server VM, Java 1.7.0_79).
Type in expressions to have them evaluated.
Type :help for more information.

scala>

从 cmd.exe 运行它时，它按预期工作。为了调试这个问题，我尝试了以下 Scala 程序:

object Test extends App {
    println(org.fusesource.jansi.internal.WindowsSupport.getConsoleMode)
}

从 Msys2 运行时，会产生以下错误:

java.lang.UnsatisfiedLinkError: Could not load library. Reasons: [no jansi in java.library.path]
    at org.fusesource.hawtjni.runtime.Library.doLoad(Library.java:182)
    at org.fusesource.hawtjni.runtime.Library.load(Library.java:140)
    at org.fusesource.jansi.internal.Kernel32.<clinit>(Kernel32.java:37)
    at org.fusesource.jansi.internal.WindowsSupport.getConsoleMode(WindowsSupport.java:50)
    at Test$.delayedEndpoint$Test$1(Test.scala:5)
    at Test$delayedInit$body.apply(Test.scala:1)
    at scala.Function0$class.apply$mcV$sp(Function0.scala:34)
    at scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:12)
    at scala.App$$anonfun$main$1.apply(App.scala:76)
    at scala.App$$anonfun$main$1.apply(App.scala:76)
    at scala.collection.immutable.List.foreach(List.scala:381)
    at scala.collection.generic.TraversableForwarder$class.foreach(TraversableForwarder.scala:35)
    at scala.App$class.main(App.scala:76)
    at Test$.main(Test.scala:1)
    at Test.main(Test.scala)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at scala.reflect.internal.util.ScalaClassLoader$$anonfun$run$1.apply(ScalaClassLoader.scala:70)
    at scala.reflect.internal.util.ScalaClassLoader$class.asContext(ScalaClassLoader.scala:31)
    at scala.reflect.internal.util.ScalaClassLoader$URLClassLoader.asContext(ScalaClassLoader.scala:101)
    at scala.reflect.internal.util.ScalaClassLoader$class.run(ScalaClassLoader.scala:70)
    at scala.reflect.internal.util.ScalaClassLoader$URLClassLoader.run(ScalaClassLoader.scala:101)
    at scala.tools.nsc.CommonRunner$class.run(ObjectRunner.scala:22)
    at scala.tools.nsc.ObjectRunner$.run(ObjectRunner.scala:39)
    at scala.tools.nsc.CommonRunner$class.runAndCatch(ObjectRunner.scala:29)
    at scala.tools.nsc.ObjectRunner$.runAndCatch(ObjectRunner.scala:39)
    at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:65)
    at scala.tools.nsc.MainGenericRunner.run$1(MainGenericRunner.scala:87)
    at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:98)
    at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:103)
    at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)

我试过但没用:

• 互联网上的一些帖子提到它可能是由于缺少 VC2008 运行时引起的，所以我确保我同时拥有 x64 和 x86。
• 从 scala/lib/jline-2.12.1.jar 中提取 jansi.dll 并将其放入我的工作目录(“.”包含在 java.library.path 中)。
• 从一个全新的 MSys2 主目录开始。
• 从 cmd.exe 运行 bash --login -i(运行 scala 时出现同样的错误)
• 尝试 32 位和 64 位 JRE

还有一件事:这个问题不影响 sbt；例如，运行“sbt console”给我一个工作的 Scala 命令行，尽管是 2.10.4 版本。

Answer 1

问题是由于 scala/bin 目录下的 scala shell script 和同一目录下的 scala.bat 名称冲突引起的. Msys2 运行 shell 脚本，而 cmd.exe 运行批处理文件。显然，shell 脚本不适合 Msys2，这导致了我看到的错误。从 MSys2 发出 cmd//c scala.bat 会生成功能正常的 Scala 命令行。

编辑 scala shell 脚本以支持 MSys2 也很简单:https://gist.github.com/kirillkh/a9ba2e00ef2e901f13bf

我已经在 GitHub 上针对此更改打开了拉取请求:https://github.com/scala/scala/pull/4674