object Tmp extends App {

  val f = Future {
    val r = Random.nextInt(500)
    if (r < 499)
      throw new RuntimeException("bad value")
    r
  }
  f.onComplete(ff => {
    if (ff.isSuccess) {
      println(s"success ${ff.get}")
    }
  })
  f.failed.foreach(t => s"failure ${t.getMessage}")
  // do the rest of your work
  println("A ..."); Thread.sleep(100)
  println("B ..."); Thread.sleep(100)
  println("C ..."); Thread.sleep(100)
  println("D ..."); Thread.sleep(100)
  println("E ..."); Thread.sleep(100)
  println("F ..."); Thread.sleep(100)
  Thread.sleep(1000)
}

A ...
B ...
C ...
D ...
E ...
F ...