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scalaideintellij-ideascala-2.7

Stuck at "Hello World" with IntelliJ IDEA 9.0.1 for Scala

I've been using Eclipse since 2.x and IDEs in general for over 20 years (since Turbo Pascal and Turbo C in the late '80s!).

(that preamble is supposed to imply, "I'm not an idiot" ... but doesn't sound so smart as I read it... LOL :-] )

Now I'm trying to use the Scala debugger in IntelliJ 9.0.1. I've resigned myself to an old standby, the "hello world" trick to check if the environment is setup correctly:

class hello {
  def main(a: Array[String]) = println("got args: " + a)
}

I also tried this version, just in case:

object hello extends Application {
    println("hi")
}

Alas, I'm unable to get even this simple Scala example to run. I'd like to eventually put a breakpoint in it, but for now just running it would be great. I have Java 1.6u20 and the Scala plug-in 0.3.473 (January 2010). The error below summarizes my experience:

alt text

What possibly could I be doing wrong?

Thanks

Solution

  • From your screenshot it looks like you were using:

    class hello {
  def main(a: Array[String]) = println("got args: " + a)
}

    The main method has to be on an object to support a main method.

    Capitalizing the object / class name is the convention but it isn't enforced.