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throw exception does not work inside future.map scala?


throw exception does not work inside future.map scala?

By : Bueká Torao García
Date : October 18 2020, 06:10 PM
Any of those help In the 1st example the exception is just that, a naked exception thrown when encountered. It's not significantly different from something like this.
code :
def testThrowException(number: Int): Future[Int] = {
  throw new Exception("BOOM!")
  . . . //code to create a Future[Int]
res0: scala.concurrent.Future[Int] = Future(Failure(java.lang.Exception: number is 0))


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How does throw new exception inside a catch work?

How does throw new exception inside a catch work?


By : Dextor
Date : March 29 2020, 07:55 AM
may help you . You're right about some assumptions, but you should go a bit deeper. Inside your try block, suppose one of your methods of your class throws this kind of exception IOException. So catch will work as way for you to treat this exceptional case. It's basically this. If you just throw your exception away using a RuntimeException, but as you did, wrapping your IOException in RuntimeException you won't lose it at all.
A normal use is in a higher level treat your exception. Here's a good tutorial about Exception Handling, please check: Best Practices for Exception Handling
Future throw exception handle outside from origin future

Future throw exception handle outside from origin future


By : Gina Paál
Date : March 29 2020, 07:55 AM
This might help you I'm not sure what you actually try to accomplish.
but for me it works this way
code :
import 'dart:async';

void main() {

  var fur1 = new Future<int>(() => 45);
//  fur1.then((value) {
//    throw new StateError('Hello error');
//  });

  var fur2 = new Future<int>(() => 24);
  fur2.then((value) {
    var x = fur1.then((value1) {
      print(value1);
        throw new StateError('Hello error'); // <= inner exception
      });
      print(value);
      return x; // <= return future
    }).catchError((err) => print('catchError: ${err}'));
  }
import 'dart:async';

void main() {

  var fur1 = new Future<int>(() => 45);
  fur1.then((value) {
    throw new StateError('Hello1 error');
  }).catchError((err) => print('catchError1: ${err}'));

  var fur2 = new Future<int>(() => 24);
  fur2.then((value) {
    var x = fur1.then((value1) {
      print(value1);
      throw new StateError('Hello2 error'); // <= inner exception
    });
    print(value);
    return x; // <= return future
  }).catchError((err) => print('catchError2: ${err}'));
}
catchError1: Bad state: Hello1 error
24
45
catchError2: Bad state: Hello2 error
[Scala][Mokito] How to stub a Future function to throw exception

[Scala][Mokito] How to stub a Future function to throw exception


By : Luis Pitta
Date : March 29 2020, 07:55 AM
hop of those help? You don't want to throw the Exception inside the Future.failed, just create it there. What happens in a call to a real repository is that an Exception is thrown in the calculation of the Future's result, and this would then be caught and placed in a Failure instance, rather than a successful calculation result being placed in a Success instance. So:
code :
when(repository.create(any[Team])(same(ec))).thenReturn(Future.failed(new Exception(...)))
Does Scala Future[T] block internally? What happens inside Scala Future?

Does Scala Future[T] block internally? What happens inside Scala Future?


By : Leo Delos Reyes
Date : March 29 2020, 07:55 AM
hope this fix your issue , Assuming you're calling code that blocks in a Future:
scala exception handling with series of dependent future and non-future method calls

scala exception handling with series of dependent future and non-future method calls


By : Pedro Filipe Serra
Date : March 29 2020, 07:55 AM
hope this fix your issue 1) Futures are firing eagerly and they aren't referentially transparent. Answers to the referenced question also contain some insights about Future's internal behavior, so I'd like to skip it here.
In order to manage side-effects concerning execution pools/queues/threads in a more predictable way, you could consider scalaz/monix/fs2 Task or iteratee/scalaz/cats Eval (more abstract lazy evaluation, and intended for sync stuff) + Cont (continuations are abstracting over subscriptions) as alternative. All are referentially transparent and start execution lazily "on-demand".
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