I've just been playing with Scala, and installed the Eclipse plugin as described at http://www.scala-lang.org/node/94, but after entering the "Hello World" test example and setting up the run configuration as described, I get the following error

Exception in thread "main" java.lang.NoSuchMethodError: main

For reference the code is

package hello

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

I've tinkered a bit with the obvious solutions (adding a main method, adding a singleton object with a main method) but I'm clearly doing something wrong.

Can anyone get their test example to work, or point out what I am doing wrong?