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

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.

When you change your implementation from class to object, it works like a charm:

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

I picked up this little, but important difference here: http://sonyarouje.com/2011/03/18/running-scala-in-intellij-idea-10/

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