Question

我正在初始化Bayeux客户端：

SslContextFactory sslContextFactory = new SslContextFactory(true);
HttpClient httpClient = new HttpClient(sslContextFactory);
httpClient.start();

Map<String, Object> options = new HashMap<String, Object>();
ClientTransport transport = new LongPollingTransport(options, httpClient);
BayeuxClient client =  new BayeuxClient("https://localhost:8483/cometd/", transport);

client.handshake();

boolean handshaken = client.waitFor(20000, BayeuxClient.State.CONNECTED);
if (!handshaken) {
    LOGGER.info("Failed to handshake");
    throw new RuntimeException("Failed to handshake");
}

我将其用于与服务器的某些通信，它可以工作，它可以订阅频道，发送和接收，然后将其闲置一会儿。我遇到以下异常：

java.util.concurrent.TimeoutException: Idle timeout 20000 ms
at org.eclipse.jetty.client.http.HttpConnectionOverHTTP.onIdleExpired(HttpConnectionOverHTTP.java:145)
at org.eclipse.jetty.io.ssl.SslConnection.onIdleExpired(SslConnection.java:286)
at org.eclipse.jetty.io.AbstractEndPoint.onIdleExpired(AbstractEndPoint.java:401)
at org.eclipse.jetty.io.IdleTimeout.checkIdleTimeout(IdleTimeout.java:166)
at org.eclipse.jetty.io.IdleTimeout$1.run(IdleTimeout.java:50)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)

，并多次出现以下内容：

java.nio.channels.ClosedChannelException: null
at org.eclipse.jetty.io.WriteFlusher.onClose(WriteFlusher.java:502)
at org.eclipse.jetty.io.AbstractEndPoint.onClose(AbstractEndPoint.java:353)
at org.eclipse.jetty.io.ChannelEndPoint.onClose(ChannelEndPoint.java:216)
at org.eclipse.jetty.io.AbstractEndPoint.doOnClose(AbstractEndPoint.java:225)
at org.eclipse.jetty.io.AbstractEndPoint.close(AbstractEndPoint.java:192)
at org.eclipse.jetty.io.AbstractEndPoint.close(AbstractEndPoint.java:175)
at org.eclipse.jetty.io.ssl.SslConnection$DecryptedEndPoint.doClose(SslConnection.java:1132)
at org.eclipse.jetty.io.AbstractEndPoint.doOnClose(AbstractEndPoint.java:220)
at org.eclipse.jetty.io.AbstractEndPoint.close(AbstractEndPoint.java:192)
at org.eclipse.jetty.io.AbstractEndPoint.close(AbstractEndPoint.java:175)
at org.eclipse.jetty.client.http.HttpConnectionOverHTTP.close(HttpConnectionOverHTTP.java:195)
at org.eclipse.jetty.client.http.HttpConnectionOverHTTP.onIdleExpired(HttpConnectionOverHTTP.java:145)
at org.eclipse.jetty.io.ssl.SslConnection.onIdleExpired(SslConnection.java:286)
at org.eclipse.jetty.io.AbstractEndPoint.onIdleExpired(AbstractEndPoint.java:401)
at org.eclipse.jetty.io.IdleTimeout.checkIdleTimeout(IdleTimeout.java:166)
at org.eclipse.jetty.io.IdleTimeout$1.run(IdleTimeout.java:50)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)

如果我让它忙，它不会失败。我尝试更改httpclient的超时，但这只会延迟问题。 Bayeux为什么不关闭通道而不进行轮询？我使用的是最新版本org.cometd.java 4.0.2。

还要注意的是，我有一个没有问题的javascript客户端。

有人可以帮忙吗？

Answer 1

默认心跳由timeout参数在服务器端控制，默认为30秒。这意味着当系统空闲时，长轮询每30秒发生一次。

您已在20秒配置了客户端idleTimeout，这从您的异常堆栈跟踪就可以看出。

当系统处于空闲状态时，客户端将在响应（长轮询）之前超时，从而导致您看到的错误。

您应该足以将客户端idleTimeout配置为大于心跳timeout的值，或者-等效地-将心跳timeout设置为小于客户端的值idleTimeout。

Answer 2

事实证明我在阻止CometD线程：

我构建了一个命令行工具来检查服务器，当我收到消息（带有来自cometD的线程）时，我正在将该线程保留给用户输入。如果我将线程保持足够长的时间，那么CometD将与上述异常断开连接。

解决方案：当您收到来自CometD的消息时，请不要保留它，而要使用新线程。

Java Bayeux客户端在空闲时通过TimeoutException断开连接

2 个答案: