Stomp 给出 TCP 连接失败和断开连接错误

Question

我已经使用 STOMP 和 sockjs 一段时间了，但有时会出现以下错误。

12:57:30.976 [48] [tcp-client-loop-nio-4] INFO  org.springframework.messaging.simp.stomp.StompBrokerRelayMessageHandler - TCP connection failure in session w6s21o5d: failed to forward DISCONNECT session=w6s21o5d
reactor.netty.channel.AbortedException: io.netty.channel.StacklessClosedChannelException
  at reactor.netty.FutureMono$FutureSubscription.wrapError(FutureMono.java:186) ~[reactor-netty-core-1.0.7.jar!/:1.0.7]
  at reactor.netty.FutureMono$FutureSubscription.operationComplete(FutureMono.java:177) [reactor-netty-core-1.0.7.jar!/:1.0.7]
  at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:578) [netty-common-4.1.65.Final.jar!/:4.1.65.Final]
  at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:552) [netty-common-4.1.65.Final.jar!/:4.1.65.Final]
  at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:491) [netty-common-4.1.65.Final.jar!/:4.1.65.Final]
  at io.netty.util.concurrent.DefaultPromise.setValue0(DefaultPromise.java:616) [netty-common-4.1.65.Final.jar!/:4.1.65.Final]
  at io.netty.util.concurrent.DefaultPromise.setFailure0(DefaultPromise.java:609) [netty-common-4.1.65.Final.jar!/:4.1.65.Final]
  at io.netty.util.concurrent.DefaultPromise.tryFailure(DefaultPromise.java:117) [netty-common-4.1.65.Final.jar!/:4.1.65.Final]
  at io.netty.channel.AbstractChannel$AbstractUnsafe.safeSetFailure(AbstractChannel.java:1021) [netty-transport-4.1.65.Final.jar!/:4.1.65.Final]
  at io.netty.channel.AbstractChannel$AbstractUnsafe.write(AbstractChannel.java:882) [netty-transport-4.1.65.Final.jar!/:4.1.65.Final]
  at io.netty.channel.DefaultChannelPipeline$HeadContext.write(DefaultChannelPipeline.java:1367) [netty-transport-4.1.65.Final.jar!/:4.1.65.Final]
  at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:717) [netty-transport-4.1.65.Final.jar!/:4.1.65.Final]
  at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:709) [netty-transport-4.1.65.Final.jar!/:4.1.65.Final]
  at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:792) [netty-transport-4.1.65.Final.jar!/:4.1.65.Final]
  at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:702) [netty-transport-4.1.65.Final.jar!/:4.1.65.Final]
  at io.netty.handler.timeout.IdleStateHandler.write(IdleStateHandler.java:304) [netty-handler-4.1.65.Final.jar!/:4.1.65.Final]
  at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:717) [netty-transport-4.1.65.Final.jar!/:4.1.65.Final]
  at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:764) [netty-transport-4.1.65.Final.jar!/:4.1.65.Final]
  at io.netty.channel.AbstractChannelHandlerContext$WriteTask.run(AbstractChannelHandlerContext.java:1071) [netty-transport-4.1.65.Final.jar!/:4.1.65.Final]
  at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164) [netty-common-4.1.65.Final.jar!/:4.1.65.Final]
  at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:472) [netty-common-4.1.65.Final.jar!/:4.1.65.Final]
  at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:497) [netty-transport-4.1.65.Final.jar!/:4.1.65.Final]
  at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989) [netty-common-4.1.65.Final.jar!/:4.1.65.Final]
  at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) [netty-common-4.1.65.Final.jar!/:4.1.65.Final]
  at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) [netty-common-4.1.65.Final.jar!/:4.1.65.Final]
  at java.lang.Thread.run(Thread.java:829) [?:?]
Caused by: io.netty.channel.StacklessClosedChannelException

断开连接消息是在页面重新加载之前从前端发送的，如下所示。

    window.addEventListener("beforeunload", function () {
        client.disconnect(function () {
            log("disconnect websocket..");
        });
    });

后端没有编写任何逻辑来处理这个 spring-stomp 处理它的其余部分。

我已经浏览了 STOMP 中的资源，但仍然没有解释为什么或到底在什么情况下会发生这种情况。导致此错误的可能原因是什么。