Convert scala future to java future

Question

I have a generated java interface containing a method:

public Future getCustomersAsync(AsyncHandler asyncHandler);

I w

Answer 1

Starting Scala 2.13, the standard library includes scala.jdk.FutureConverters which provides Scala to Java Future conversions (and vice versa):

import scala.jdk.FutureConverters._

// val scalaFuture: scala.concurrent.Future[Int] = Future.successful(42)
scalaFuture.asJava
// java.util.concurrent.CompletionStage[Int] = 

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Note for Java users, you'd rather use FutureConverters the explicit way:

import scala.jdk.javaapi.FutureConverters;

// val scalaFuture: scala.concurrent.Future[Int] = Future.successful(42)
FutureConverters.asJava(scalaFuture);
// java.util.concurrent.CompletionStage[Int] =