How to convert a Scala Iterable into Java util.List?

I have a written a method in Scala that is using a method written in Java - processSale() method takes util.List<Sale> as a parameter.

But after groupByKey() I'm getting an RDD[(String, Iterable[Sale])]. I've tried to import scala.collection.JavaConverters._ and do SaleParser.processSale(a.asJava).

However it gives me an Iterable[Sale]. How is it possible to convert it into a Java util.List?

val parseSales: RDD[(String, Sale)] = rawSales
      .map(sale => sale.Id -> sale)
      .groupByKey()
      .mapValues(a => SaleParser.processSale(???))