什么是来自.net的java等效的AggregateException？

Question

在.net中,AggregateException类允许您抛出包含多个异常的异常.

例如,如果并行运行多个任务,并且其中一些任务因异常而失败,则您希望抛出AggregateException.

java有一个等价的类吗？

具体案例我想用它:

public static void runMultipleThenJoin(Runnable... jobs) {
    final List<Exception> errors = new Vector<Exception>();
    try {
        //create exception-handling thread jobs for each job
        List<Thread> threads = new ArrayList<Thread>();
        for (final Runnable job : jobs)
            threads.add(new Thread(new Runnable() {public void run() {
                try {
                    job.run();
                } catch (Exception ex) {
                    errors.add(ex);
                }
            }}));

        //start all
        for (Thread t : threads)
            t.start();

        //join all
        for (Thread t : threads)
            t.join();            
    } catch (InterruptedException ex) {
        //no way to recover from this situation
        throw new RuntimeException(ex);
    }

    if (errors.size() > 0)
        throw new AggregateException(errors); 
}

Answer 1

Java 7的Throwable.addSuppressed(Throwable)会做类似的事情,虽然它的目的略有不同(try-with-resource)

Answer 2

我不知道任何内置类或库类，因为我以前从未想过这样做（通常您只会链接异常），但自己编写并不难。

您可能希望选择其中一个异常作为“主要”异常，以便它可以用于填充堆栈跟踪等。

public class AggregateException extends Exception {

    private final Exception[] secondaryExceptions;

    public AggregateException(String message, Exception primary, Exception... others) {
        super(message, primary);
        this.secondaryExceptions = others == null ? new Exception[0] : others;
    }

    public Throwable[] getAllExceptions() {

        int start = 0;
        int size = secondaryExceptions.length;
        final Throwable primary = getCause();
        if (primary != null) {
            start = 1;
            size++;
        }

        Throwable[] all = new Exception[size];

        if (primary != null) {
            all[0] = primary;
        }

        Arrays.fill(all, start, all.length, secondaryExceptions);
        return all;
    }

}