如何从 CompletableFuture.join() 获取原始异常？
How to get original exception from CompletableFuture.join()?
有什么方法可以获取当任务执行因异常而失败时抛出的原始异常？看起来 CompletableFuture.join 总是在失败时抛出 CompletionException。
我们的原始异常包含额外的属性（成员变量），必须使用这些属性以正确的方式处理异常。
来自the docs：
To better conform with the use of common functional forms, if a computation involved in the completion of this CompletableFuture threw an exception, this method throws an (unchecked) CompletionException with the underlying exception as its cause.
换句话说，
Exception original = completableException.getCause();
有什么方法可以获取当任务执行因异常而失败时抛出的原始异常？看起来 CompletableFuture.join 总是在失败时抛出 CompletionException。
我们的原始异常包含额外的属性（成员变量），必须使用这些属性以正确的方式处理异常。
来自the docs：
To better conform with the use of common functional forms, if a computation involved in the completion of this CompletableFuture threw an exception, this method throws an (unchecked) CompletionException with the underlying exception as its cause.
换句话说，
Exception original = completableException.getCause();