一直报这个错误，已经好几次了，还有就是代码经常提示不全

WebSocket encountered error

java.io.IOException: java.util.concurrent.ExecutionException: java.io.IOException: 远程主机强迫关闭了一个现有的连接。
at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.sendMessageBlock(WsRemoteEndpointImplBase.java:327)
at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.sendMessageBlock(WsRemoteEndpointImplBase.java:262)
at org.apache.tomcat.websocket.WsSession.sendCloseMessage(WsSession.java:816)
at org.apache.tomcat.websocket.WsSession.onClose(WsSession.java:739)
at org.apache.tomcat.websocket.WsFrameBase.processDataControl(WsFrameBase.java:367)
at org.apache.tomcat.websocket.WsFrameBase.processData(WsFrameBase.java:296)
at org.apache.tomcat.websocket.WsFrameBase.processInputBuffer(WsFrameBase.java:133)
at org.apache.tomcat.websocket.WsFrameClient.processSocketRead(WsFrameClient.java:95)
at org.apache.tomcat.websocket.WsFrameClient.resumeProcessing(WsFrameClient.java:212)
at org.apache.tomcat.websocket.WsFrameClient.access$500(WsFrameClient.java:31)
at org.apache.tomcat.websocket.WsFrameClient$WsFrameClientCompletionHandler.doResumeProcessing(WsFrameClient.java:189)
at org.apache.tomcat.websocket.WsFrameClient$WsFrameClientCompletionHandler.completed(WsFrameClient.java:163)
at org.apache.tomcat.websocket.WsFrameClient$WsFrameClientCompletionHandler.completed(WsFrameClient.java:148)
at java.base/sun.nio.ch.Invoker.invokeUnchecked(Invoker.java:129)
at java.base/sun.nio.ch.Invoker.invokeUnchecked(Invoker.java:284)
at java.base/sun.nio.ch.WindowsAsynchronousSocketChannelImpl$ReadTask.completed(WindowsAsynchronousSocketChannelImpl.java:586)
at java.base/sun.nio.ch.Iocp$EventHandlerTask.run(Iocp.java:387)
at java.base/sun.nio.ch.AsynchronousChannelGroupImpl$1.run(AsynchronousChannelGroupImpl.java:113)
at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
at java.base/java.lang.Thread.run(Thread.java:840)
Caused by: java.util.concurrent.ExecutionException: java.io.IOException: 远程主机强迫关闭了一个现有的连接。
at java.base/sun.nio.ch.PendingFuture.get(PendingFuture.java:200)
at org.apache.tomcat.websocket.WsRemoteEndpointImplClient.doWrite(WsRemoteEndpointImplClient.java:62)
at org.apache.tomcat.websocket.WsRemoteEndpointImplBase$OutputBufferSendHandler.write(WsRemoteEndpointImplBase.java:952)
at org.apache.tomcat.websocket.WsRemoteEndpointImplBase$OutputBufferSendHandler.onResult(WsRemoteEndpointImplBase.java:967)
at org.apache.tomcat.websocket.WsRemoteEndpointImplClient.doWrite(WsRemoteEndpointImplClient.java:68)
at org.apache.tomcat.websocket.WsRemoteEndpointImplBase$OutputBufferSendHandler.write(WsRemoteEndpointImplBase.java:909)
at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.writeMessagePart(WsRemoteEndpointImplBase.java:509)
at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.sendMessageBlock(WsRemoteEndpointImplBase.java:314)
... 20 more
Caused by: java.io.IOException: 远程主机强迫关闭了一个现有的连接。
at java.base/sun.nio.ch.WindowsAsynchronousSocketChannelImpl.write0(Native Method)
at java.base/sun.nio.ch.WindowsAsynchronousSocketChannelImpl$WriteTask.run(WindowsAsynchronousSocketChannelImpl.java:784)
at java.base/sun.nio.ch.WindowsAsynchronousSocketChannelImpl.implWrite(WindowsAsynchronousSocketChannelImpl.java:920)
at java.base/sun.nio.ch.AsynchronousSocketChannelImpl.write(AsynchronousSocketChannelImpl.java:382)
at java.base/sun.nio.ch.AsynchronousSocketChannelImpl.write(AsynchronousSocketChannelImpl.java:387)
at org.apache.tomcat.websocket.AsyncChannelWrapperNonSecure.write(AsyncChannelWrapperNonSecure.java:58)
... 27 more