Intellij content-assist unable to implement Java Interface in S

After hitting command-I for Implement Methods, the screenshot shows two methods that require being overridden to create a concrete class implementing IRichSpout.
Upon selecting both and hitting OK, nothing happens. The methods are not added to the scala class

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Hit OK .. nothing added ..

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Update To help diagnose, I had noticed the "override" seems to work. So I made the class extend the NoOpSpout class - and tried to override one of the methods that was unable to be implemented (when extending directly the IRichSpout). This did work!

class DummySpout extends NoOpSpout

class AkkaSpout extends DummySpout { //  BaseRichSpout with IRichSpout {
  override def getComponentConfiguration: util.Map[String, AnyRef] = super.getComponentConfiguration

  override def open(conf: util.Map[_, _], context: TopologyContext, collector: SpoutOutputCollector): Unit =, context, collector)

Notice that the open method now was overridden more or less correctly (some small manual adjustments for the java-to-scala conversion still required).

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