How do you call a Scala singleton method from Java?

I'm trying to inject some Scala code into my existing Java app. (So, being said, I want some more fun).

I create a singleton stuff in Scala

ScalaPower.scala

    package org.fun
    class ScalaPower
    object ScalaPower{
      def showMyPower(time:Int) = {
        (0 to time-1).mkString(", ")
      }
    }

Now, inside OldJava.java

class OldJava {
  public void demo(){
    System.out.println(?)
  }
}

What should I fill in ? so that Java will call the showMyPower method? I tried both org.fun.ScalaPower.showMyPower(10) and org.fun.ScalaPower.getInstance().showMyPower(10) but none work.

(Decompile the class file using Jad show me nothing but nonsense code.)

Edit I remove the class ScalaPower declaration and scala produce the static method as expected. (call to org.fun.ScalaPower.showMyPower(10) just works).

Wonder if it's a bug in scala compiler or not