Convert A Java Future To A Scala Future
Answer : How about just wrapping it (I'm assuming there's an implicit ExecutionContext here): val scalaFuture = Future { javaFuture.get } EDIT: A simple polling strategy could look like this (java.util.Future => F): def pollForResult[T](f: F[T]): Future[T] = Future { Thread.sleep(500) f }.flatMap(f => if (f.isDone) Future { f.get } else pollForResult(f)) This will check if the Java future is done every 500ms. Obviously the total blocking time is the same as above (rounded up to the nearest 500ms) but this solution will allow other tasks to be interleaved in the same thread of the ExecutionContext . Starting Scala 2.13 , the standard library includes scala.jdk.FutureConverters which provides Java to Scala CompletableFuture/Future implicit conversions: import scala.jdk.FutureConverters._ // val javaFuture = java.util.concurrent.CompletableFuture.completedFuture(12) val scalaFuture = javaFuture.asScala // scalaFuture: scala.concurrent.Future[Int] = Future(...