inner-future-exception.scala

// If you create a Future inside another Future, the inner one
// will not log exceptions thrown in its body to the console.
//
// Why not?
//
// Example:
import scala.concurrent.ExecutionContext.Implicits.global
import scala.concurrent.Future

val fut = Future {
  Future {
    println("This print will show in the logs...")
    throw new RuntimeException("But this exception never appears in the logs!")
  }
  1
}

Future { 
  throw new RuntimeException("This non-nested throwaway Future _also_ doesn't appear")
}
 
fut.foreach { _ => throw new RuntimeException("This exception appears also, as expected.") }