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我已经下载了最新版本的 websocket 和 spring 示例

https://github.com/rstoyanchev/spring-websocket-portfolio。

我在 Tomcat 8.0 RC5 上运行应用程序并使用消息代理 RabbitMQ 3.1.5。由于以下错误，模拟仅运行 2-3 次，之后模拟不再起作用。我也尝试在 Glassfish 4.0 上运行该应用程序，但出现同样的错误。你能帮忙看看可能是什么原因吗？

15:47:35 [BrokerWebSocketChannel-1] ExceptionWebSocketHandlerDecorator - Unhandl
ed error for ExceptionWebSocketHandlerDecorator [delegate=LoggingWebSocketHandle
rDecorator [delegate=org.springframework.messaging.handler.websocket.SubProtocol
WebSocketHandler@1d2bde4]]
java.lang.IllegalStateException: The WebSocket session has been closed and no me
thod (apart from close()) may be called on a closed session
        at org.apache.tomcat.websocket.WsSession.checkState(WsSession.java:642)
        at org.apache.tomcat.websocket.WsSession.getNegotiatedSubprotocol(WsSess
ion.java:297)
        at org.springframework.web.socket.adapter.StandardWebSocketSession.getAc
ceptedProtocol(StandardWebSocketSession.java:113)
        at org.springframework.web.socket.sockjs.transport.session.WebSocketServ
erSockJsSession.getAcceptedProtocol(WebSocketServerSockJsSession.java:91)
        at org.springframework.messaging.handler.websocket.SubProtocolWebSocketH
andler.findProtocolHandler(SubProtocolWebSocketHandler.java:149)
        at org.springframework.messaging.handler.websocket.SubProtocolWebSocketH
andler.afterConnectionClosed(SubProtocolWebSocketHandler.java:224)
        at org.springframework.web.socket.support.WebSocketHandlerDecorator.afte
rConnectionClosed(WebSocketHandlerDecorator.java:69)
        at org.springframework.web.socket.support.LoggingWebSocketHandlerDecorat
or.afterConnectionClosed(LoggingWebSocketHandlerDecorator.java:74)
        at org.springframework.web.socket.support.ExceptionWebSocketHandlerDecor
ator.afterConnectionClosed(ExceptionWebSocketHandlerDecorator.java:89)
        at org.springframework.web.socket.sockjs.transport.session.AbstractSockJ
sSession.close(AbstractSockJsSession.java:237)
        at org.springframework.messaging.simp.stomp.StompProtocolHandler.handleM
essageToClient(StompProtocolHandler.java:183)
        at org.springframework.messaging.handler.websocket.SubProtocolWebSocketH
andler.handleMessage(SubProtocolWebSocketHandler.java:194)
        at org.springframework.messaging.support.channel.ExecutorSubscribableCha
nnel$1.run(ExecutorSubscribableChannel.java:80)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.
java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor
.java:615)
        at java.lang.Thread.run(Thread.java:724)
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