How to convert a scala.List to a java.util.List?

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Not sure why this hasn’t been mentioned before but I think the most intuitive way is to invoke the asJava decorator method of JavaConverters directly on the Scala list:

scala> val scalaList = List(1,2,3)
scalaList: List[Int] = List(1, 2, 3)

scala> import scala.collection.JavaConverters._
import scala.collection.JavaConverters._

scala> scalaList.asJava
res11: java.util.List[Int] = [1, 2, 3]

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