Scala 2.9 can't run "hello world" sample on Windows XP
I'开发者_StackOverflow社区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.
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.
I think it´s a CLASSPATH
issue. You could try this:
$ scala -classpath . Hello
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