Vaadin7视频异常

Question

有时，在使用Video组件时会出现以下异常：

May 24, 2021 1:20:32 PM com.vaadin.server.DefaultErrorHandler doDefault
SEVERE: 
org.eclipse.jetty.io.EofException
    at org.eclipse.jetty.io.ChannelEndPoint.flush(ChannelEndPoint.java:284)
    at org.eclipse.jetty.io.WriteFlusher.flush(WriteFlusher.java:393)
    at org.eclipse.jetty.io.WriteFlusher.completeWrite(WriteFlusher.java:349)
    at org.eclipse.jetty.io.ChannelEndPoint$3.run(ChannelEndPoint.java:132)
    at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)
    at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:295)
    at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)
    at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126)
    at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:765)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:683)
    at java.lang.Thread.run(Thread.java:748)
Caused by: java.io.IOException: An established connection was aborted by the software in your host machine
    at sun.nio.ch.SocketDispatcher.write0(Native Method)
    at sun.nio.ch.SocketDispatcher.write(SocketDispatcher.java:51)
    at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:93)
    at sun.nio.ch.IOUtil.write(IOUtil.java:65)
    at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:471)
    at org.eclipse.jetty.io.ChannelEndPoint.flush(ChannelEndPoint.java:262)
    ... 11 more

在Tomcat下似乎也会发生类似的错误，但它有更多与Vaadin直接相关的信息。我不能证明它们是相同的错误，因为Jetty提供的信息很稀疏，但它们确实在类似的情况下发生。

[2021-05-24 13:39:15 EDT] INFO org.apache.catalina.core.StandardWrapperValve invoke [2021-05-24 13:39:15 EDT] SEVERE com.mobiwms.website.WmsUI$1 error Uncaught exception
org.apache.catalina.connector.ClientAbortException: java.io.IOException: Broken pipe
    at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:356)
    at org.apache.catalina.connector.OutputBuffer.appendByteArray(OutputBuffer.java:795)
    at org.apache.catalina.connector.OutputBuffer.append(OutputBuffer.java:724)
    at org.apache.catalina.connector.OutputBuffer.writeBytes(OutputBuffer.java:391)
    at org.apache.catalina.connector.OutputBuffer.write(OutputBuffer.java:369)
    at org.apache.catalina.connector.CoyoteOutputStream.write(CoyoteOutputStream.java:96)
    at com.vaadin.server.DownloadStream.writeResponse(DownloadStream.java:307)
    at com.vaadin.ui.AbstractMedia.handleConnectorRequest(AbstractMedia.java:129)
    at com.vaadin.server.ConnectorResourceHandler.handleRequest(ConnectorResourceHandler.java:90)
    at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1435)
    at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:380)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:185)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:800)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:806)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:748)
Caused by: java.io.IOException: Broken pipe
    at sun.nio.ch.FileDispatcherImpl.write0(Native Method)
    at sun.nio.ch.SocketDispatcher.write(SocketDispatcher.java:47)
    at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:93)
    at sun.nio.ch.IOUtil.write(IOUtil.java:65)
    at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:471)
    at org.apache.tomcat.util.net.SecureNioChannel.flush(SecureNioChannel.java:144)
    at org.apache.tomcat.util.net.SecureNioChannel.write(SecureNioChannel.java:654)
    at org.apache.tomcat.util.net.NioBlockingSelector.write(NioBlockingSelector.java:101)
    at org.apache.tomcat.util.net.NioSelectorPool.write(NioSelectorPool.java:157)
    at org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper.doWrite(NioEndpoint.java:1306)
    at org.apache.tomcat.util.net.SocketWrapperBase.doWrite(SocketWrapperBase.java:726)
    at org.apache.tomcat.util.net.SocketWrapperBase.writeBlocking(SocketWrapperBase.java:496)
    at org.apache.tomcat.util.net.SocketWrapperBase.write(SocketWrapperBase.java:434)
    at org.apache.coyote.http11.Http11OutputBuffer$SocketOutputBuffer.doWrite(Http11OutputBuffer.java:623)
    at org.apache.coyote.http11.filters.IdentityOutputFilter.doWrite(IdentityOutputFilter.java:116)
    at org.apache.coyote.http11.Http11OutputBuffer.doWrite(Http11OutputBuffer.java:225)
    at org.apache.coyote.Response.doWrite(Response.java:541)
    at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:351)
    ... 34 more

如何防止此问题？如果我知道在try...catch中包装什么，我会这么做，但我不完全确定要包装什么。它是非常随机的。我知道如果我连续多次打开和关闭视频，我可以触发它，相当快。从我在网上看到的情况来看，这可能与超时有关，但这种随机性让我感到困惑。有时我不会得到错误，有时我会，无论自动播放是打开还是关闭。我看不到一个可靠的模式。

Answer 1

当服务器正在向浏览器写入文件(这里是视频流)时，连接断开时会发生异常。显然，浏览器没有正常关闭或代理断开了连接。

Answer 2

我真的不喜欢这个答案，但它似乎解决了这个问题。如果人们有更好的解决方案，请告诉我。总之，基本上，既然handleConnectorRequest已经注意到了这个问题，我想我可以通过忽略异常来绕过这个错误。

        helpVideo = new Video() {

            @Override
            public boolean handleConnectorRequest(VaadinRequest request, VaadinResponse response, String path)
                    throws IOException {
                
                try {
                    return super.handleConnectorRequest(request, response, path);
                } catch (IOException e) {
                    LOGGER.severe("Exception with video: " + e);
                }
                
                // This is not ideal, but we are sort of faking that things worked to get around other issues
                return true;
            }
            
        };

是的，虽然这是完全合法的，但这似乎是一个可怕的想法。但是它是有效的，所以我为有同样问题的人提供了一种变通方法。