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class StreamsException {
    // New**
     * @return  the {@link TaskId} that this exception originated from, or {@link Optional#empty()} if the exception
     *          cannot be traced back to a particular task. Note that the {@code TaskId} being empty does not
     *          guarantee that the exception wasn't directly related to a specific task.
     */
     public TaskIdOptional<TaskId> taskId() {
        return taskId;
    }
}