public static Throwable getCompletedException()

in src/main/java/com/spotify/futures/CompletableFuturesExtra.java [207:219]

• 13 lines of code
• 3 McCabe index (conditional complexity)

  public static Throwable getCompletedException(CompletionStage<?> stage) {
    CompletableFuture<?> future = stage.toCompletableFuture();
    checkCompleted(future);
    if (!future.isCompletedExceptionally()) {
      throw new IllegalStateException("future was not completed exceptionally");
    }
    try {
      future.join();
      throw new IllegalStateException("Unreachable");
    } catch (CompletionException | CancellationException e) {
      return e;
    }
  }