public static Throwable getException()

in src/main/java/com/spotify/futures/CompletableFutures.java [292:303]

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

  public static <T> Throwable getException(CompletionStage<T> stage) {
    CompletableFuture<T> future = stage.toCompletableFuture();
    if (!future.isCompletedExceptionally()) {
      throw new IllegalStateException("future was not completed exceptionally");
    }
    try {
      future.join();
      return null;
    } catch (CompletionException x) {
      return x.getCause();
    }
  }