创建新的嵌入式媒体播放器组件时，java VLCJ NoSuchElementException

Question

我面临以下异常

playing all sources
receiveed sources are : [wow24=/home/younes/Desktop/test.mp4, wow23=/home/younes/Desktop/test.mp4, wow26=/home/younes/Desktop/test.mp4, wow25=/home/younes/Desktop/test.mp4, wow28=/home/younes/Desktop/test.mp4, test=/home/younes/Desktop/test.mp4, wow1=/home/younes/Desktop/test.mp4, wow16=/home/younes/Desktop/test.mp4, wow27=/home/younes/Desktop/test.mp4, wow19=/home/younes/Desktop/test.mp4, wow18=/home/younes/Desktop/test.mp4, wow29=/home/younes/Desktop/test.mp4, wow9=/home/younes/Desktop/test.mp4, wow20=/home/younes/Desktop/test.mp4, wow31=/home/younes/Desktop/test.mp4, wow30=/home/younes/Desktop/test.mp4, wow22=/home/younes/Desktop/test.mp4, wow11=rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mov, wow21=/home/younes/Desktop/test.mp4, wow10=rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mov]
receiveed sources are : [wow24=/home/younes/Desktop/test.mp4, wow23=/home/younes/Desktop/test.mp4, wow26=/home/younes/Desktop/test.mp4, wow25=/home/younes/Desktop/test.mp4, wow28=/home/younes/Desktop/test.mp4, test=/home/younes/Desktop/test.mp4, wow1=/home/younes/Desktop/test.mp4, wow16=/home/younes/Desktop/test.mp4, wow27=/home/younes/Desktop/test.mp4, wow19=/home/younes/Desktop/test.mp4, wow18=/home/younes/Desktop/test.mp4, wow29=/home/younes/Desktop/test.mp4, wow9=/home/younes/Desktop/test.mp4, wow20=/home/younes/Desktop/test.mp4, wow31=/home/younes/Desktop/test.mp4, wow30=/home/younes/Desktop/test.mp4, wow22=/home/younes/Desktop/test.mp4, wow11=rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mov, wow21=/home/younes/Desktop/test.mp4, wow10=rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mov]
adding panel wow24
adding panel wow24
playing all sources
Exception in thread "Thread-1" Exception in thread "Thread-2" java.util.NoSuchElementException
    at sun.misc.CompoundEnumeration.nextElement(CompoundEnumeration.java:59)
    at java.util.ServiceLoader$LazyIterator.hasNextService(ServiceLoader.java:357)
    at java.util.ServiceLoader$LazyIterator.hasNext(ServiceLoader.java:393)
    at java.util.ServiceLoader$1.hasNext(ServiceLoader.java:474)
    at uk.co.caprica.vlcj.factory.discovery.provider.DirectoryProviderDiscoveryStrategy.getSupportedProviders(DirectoryProviderDiscoveryStrategy.java:75)
    at uk.co.caprica.vlcj.factory.discovery.provider.DirectoryProviderDiscoveryStrategy.discoveryDirectories(DirectoryProviderDiscoveryStrategy.java:67)
    at uk.co.caprica.vlcj.factory.discovery.strategy.BaseNativeDiscoveryStrategy.discover(BaseNativeDiscoveryStrategy.java:68)
    at uk.co.caprica.vlcj.factory.discovery.NativeDiscovery.discover(NativeDiscovery.java:112)
    at uk.co.caprica.vlcj.factory.MediaPlayerFactory.discoverNativeLibrary(MediaPlayerFactory.java:187)
    at uk.co.caprica.vlcj.factory.MediaPlayerFactory.<init>(MediaPlayerFactory.java:119)
    at uk.co.caprica.vlcj.factory.MediaPlayerFactory.<init>(MediaPlayerFactory.java:143)
    at uk.co.caprica.vlcj.player.component.EmbeddedMediaPlayerComponent.initMediaPlayerFactory(EmbeddedMediaPlayerComponent.java:116)
    at uk.co.caprica.vlcj.player.component.EmbeddedMediaPlayerComponent.<init>(EmbeddedMediaPlayerComponent.java:77)
    at uk.co.caprica.vlcj.player.component.EmbeddedMediaPlayerComponent.<init>(EmbeddedMediaPlayerComponent.java:111)
    at com.wanasis.vlc.view.VideoSlotPanel.<init>(VideoSlotPanel.java:101)
    at com.wanasis.vlc.view.MainFrame.lambda$2(MainFrame.java:168)
    at java.util.HashMap$EntrySet.forEach(HashMap.java:1044)
    at com.wanasis.vlc.view.MainFrame.setupGridView(MainFrame.java:167)
    at com.wanasis.vlc.view.MainFrame.lambda$0(MainFrame.java:84)
    at java.lang.Thread.run(Thread.java:748)
    at com.wanasis.vlc.view.MainFrame.setDisplayableSources(MainFrame.java:86)
    at com.wanasis.vlc.control.MainFrameBuilder.lambda$1(MainFrameBuilder.java:98)
    at java.lang.Thread.run(Thread.java:748)
java.util.NoSuchElementException
    at sun.misc.CompoundEnumeration.nextElement(CompoundEnumeration.java:59)
    at java.util.ServiceLoader$LazyIterator.hasNextService(ServiceLoader.java:357)
    at java.util.ServiceLoader$LazyIterator.hasNext(ServiceLoader.java:393)
    at java.util.ServiceLoader$1.hasNext(ServiceLoader.java:474)
    at uk.co.caprica.vlcj.factory.discovery.provider.DirectoryProviderDiscoveryStrategy.getSupportedProviders(DirectoryProviderDiscoveryStrategy.java:75)
    at uk.co.caprica.vlcj.factory.discovery.provider.DirectoryProviderDiscoveryStrategy.discoveryDirectories(DirectoryProviderDiscoveryStrategy.java:67)
    at uk.co.caprica.vlcj.factory.discovery.strategy.BaseNativeDiscoveryStrategy.discover(BaseNativeDiscoveryStrategy.java:68)
    at uk.co.caprica.vlcj.factory.discovery.NativeDiscovery.discover(NativeDiscovery.java:112)
    at uk.co.caprica.vlcj.factory.MediaPlayerFactory.discoverNativeLibrary(MediaPlayerFactory.java:187)
    at uk.co.caprica.vlcj.factory.MediaPlayerFactory.<init>(MediaPlayerFactory.java:119)
    at uk.co.caprica.vlcj.factory.MediaPlayerFactory.<init>(MediaPlayerFactory.java:143)
    at uk.co.caprica.vlcj.player.component.EmbeddedMediaPlayerComponent.initMediaPlayerFactory(EmbeddedMediaPlayerComponent.java:116)
    at uk.co.caprica.vlcj.player.component.EmbeddedMediaPlayerComponent.<init>(EmbeddedMediaPlayerComponent.java:77)
    at uk.co.caprica.vlcj.player.component.EmbeddedMediaPlayerComponent.<init>(EmbeddedMediaPlayerComponent.java:111)
    at com.wanasis.vlc.view.VideoSlotPanel.<init>(VideoSlotPanel.java:101)
    at com.wanasis.vlc.view.MainFrame.lambda$2(MainFrame.java:168)
    at java.util.HashMap$EntrySet.forEach(HashMap.java:1044)
    at com.wanasis.vlc.view.MainFrame.setupGridView(MainFrame.java:167)
    at com.wanasis.vlc.view.MainFrame.lambda$0(MainFrame.java:84)
    at java.lang.Thread.run(Thread.java:748)
    at com.wanasis.vlc.view.MainFrame.setDisplayableSources(MainFrame.java:86)
    at com.wanasis.vlc.control.MainFrameBuilder.lambda$1(MainFrameBuilder.java:98)
    at java.lang.Thread.run(Thread.java:748)
the printed key is : wanaDVR
the printed key is : hjgfd

您可以猜到我正在同时播放多个视频，在这里实现这一点是我代码的所有重要部分

我有一个显示管理器，每次我的视频源更新时都会触发更新

public  static void updateGridDisplay(HashMap<String, String> displayableSources) {

        new Thread(() -> {
            while (mainFrame == null || !mainFrame.isVisible())
                try {

                    Thread.sleep(100);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            mainFrame.setDisplayableSources(displayableSources);
        }).start();

    }

设置可显示源的方法如下

    public void setDisplayableSources(HashMap<String, String> displayableSources) {
        this.displayableSources = new HashMap<>(displayableSources);
        new Thread(() -> {
            while (!isVisible()) {
                try {
                    Thread.sleep(200);
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

            }
            setupGridView();
        }).run();
    } 

如您所见，我总是担心可见性，因为vlcj嵌入组件需要使组件可见才能正常工作

我的想法很简单：一个以面板为组成部分的网格，每个人都拿着它作为媒体播放器。

    private void setupGridView() {

        for (Component c : centerPanel.getComponents()) {
            if (c instanceof VideoSlotPanel) {
                VideoSlotPanel slotPanel = (VideoSlotPanel) c;
                slotPanel.pause();
            }

        }

        centerPanel.removeAll();

        System.out.println("receiveed sources are : " + displayableSources.entrySet());
        displayableSources.entrySet().forEach(entry -> {
            centerPanel.add(new VideoSlotPanel(entry.getValue(), entry.getKey()));
        });

        centerPanel.revalidate();
        revalidate();
        centerPanel.repaint();
        repaint();

        if (isVisible())
            for (Component c : centerPanel.getComponents()) {
                if (c instanceof VideoSlotPanel) {
                    VideoSlotPanel slotPanel = (VideoSlotPanel) c;
                    slotPanel.play();
                }

            }

    }

最后，视频广告位面板很简单，只需包装vlcj嵌入式视频组件

public VideoSlotPanel(final String source, final String title) {

        this.title = title;
        this.source = source;

        System.out.println("adding panel "+title);

        setLayout(new BorderLayout(0, 0));

        setBorder(BorderFactory.createEmptyBorder(1, 1, 1, 1));

        slotPanel = new JPanel();
        add(slotPanel, BorderLayout.CENTER);
        slotPanel.setLayout(new GridLayout(1, 0, 0, 0));

        empc = new EmbeddedMediaPlayerComponent();  
        empc.mediaPlayer().input().enableKeyInputHandling(false);
        empc.mediaPlayer().input().enableMouseInputHandling(false);

        empc.videoSurfaceComponent().addMouseListener(new FullscreenShowMouseClickEvent());

        slotPanel.add(empc);

        SlotsManager.subscribe(this);
        parent = this;
    }

行代码empc = new EmbeddedMediaPlayerComponent();引发了这种异常，为什么以及如何，我无法理解这一点，也无法通过逻辑推理加以解决，即使我采用线程化风格，我也认为这应该可行： JVM在开始运行应用程序之前具有所有必需的工具和类（重用vlcj API组件）

此错误每3或4次出现1次

普通应用中没有致命或破坏行为

我该怎么做