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Editorial Team
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Asked: 2026-05-25T22:33:33+00:00

I’m trying to run HelloWorld sample with scala 2.9.1 final on Windows XP: object

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I’m trying to run HelloWorld sample with scala 2.9.1 final on Windows XP:

object HelloWorld extends App {
  println("Hello, World!")
}

File is saved as Hello.scala.

When I run scalac Hello.scala, it’s ok.

When I run scala Hello, it writes: 

"Exception in thread "main" java.lang.RuntimeException: Cannot figure out how to run target"

It’s ridiculous, my echo %PATH% contains: 

C:\Program Files\Java\jdk1.6.0_25\bin;
C:\Program Files\Java\jdk1.6.0_25\jre\lib;
C:\Program Files\Java\jdk1.6.0_25\lib;
C:\Program Files\scala\bin

so everything seems to be in classpath.

Running scala -classpath "%PATH%;." Hello doesn’t help either.

Please help.

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1 Answer

  1. Editorial Team

    Shouldn’t it be scala HelloWorld?

    I can repro your problem on Mac too:

    $ scalac hello.scala 
$ scala HelloWorld
Hello, World!
$ scala Hello
Exception in thread "main" java.lang.RuntimeException: Cannot figure out how to run target: Hello
    at scala.sys.package$.error(package.scala:27)
    at scala.tools.nsc.GenericRunnerCommand.scala$tools$nsc$GenericRunnerCommand$$guessHowToRun(GenericRunnerCommand.scala:38)
    at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
    at scala.tools.nsc.GenericRunnerCommand$$anonfun$2.apply(GenericRunnerCommand.scala:48)
    at scala.Option.getOrElse(Option.scala:109)
    at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:48)
    at scala.tools.nsc.GenericRunnerCommand.<init>(GenericRunnerCommand.scala:17)
    at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:33)
    at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:89)
    at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)

    scala expects either a class name or a source name. scala Hello doesn’t resolve to either of them.

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