##【Java记录】try-with-resources的一个坑

今天处理 AsynchronousFileChannel 时候的一个问题，代码如下：

public static void main(String[] args) throws Exception {    String filePath = "/home/xe/git/osc/JavaNote/Lang/data/Test.java";    ExecutorService executorService = Executors.newSingleThreadExecutor();    Set
    
      openOptions = new HashSet<>(Arrays.asList(new StandardOpenOption[]{StandardOpenOption.READ}));    try (AsynchronousFileChannel asynchronousFileChannel = AsynchronousFileChannel.open(Paths.get(filePath), openOptions, executorService)) {        ByteBuffer buffer = ByteBuffer.allocate(1024);        asynchronousFileChannel.read(buffer, 0, buffer, new CompletionHandler
     
      () {            @Override            public void completed(Integer result, ByteBuffer attachment) {                System.out.println("completed,result = " + result);                executorService.shutdown();            }            @Override            public void failed(Throwable exc, ByteBuffer attachment) {                System.out.println("failed");                exc.printStackTrace();                executorService.shutdown();            }        });    } catch (Exception e) {    }}
     
    

一直提示：

java.nio.channels.AsynchronousCloseException

一直找不到问题的原因，因为我并没有显式的去关闭 AsynchronousFileChannel，后来才发现，是被 try-with-resources 特性给关闭了，悲伤的故事。

所以，在异步调用中， 还是谨慎的处理通告的关闭操作比较好。