There is this exception in logs from time to time using Vaadin 25 with Spring-boot 4:
[nio-8080-exec-8] o.atmosphere.cpr.AsynchronousProcessor : Failed to cancel resource: ddf5b314-760d-4bfe-a28f-45183b8d5b7d
java.lang.IllegalStateException: Message will not be sent because the WebSocket session has been closed
at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.writeMessagePart(WsRemoteEndpointImplBase.java:458) ~[tomcat-websocket.jar:11.0.22]
at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.startMessage(WsRemoteEndpointImplBase.java:415) ~[tomcat-websocket.jar:11.0.22]
at org.apache.tomcat.websocket.WsRemoteEndpointImplBase$TextMessageSendHandler.write(WsRemoteEndpointImplBase.java:829) ~[tomcat-websocket.jar:11.0.22]
at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.sendStringByCompletion(WsRemoteEndpointImplBase.java:216) ~[tomcat-websocket.jar:11.0.22]
at org.apache.tomcat.websocket.WsRemoteEndpointAsync.sendText(WsRemoteEndpointAsync.java:46) ~[tomcat-websocket.jar:11.0.22]
at org.atmosphere.container.version.JSR356WebSocket.write(JSR356WebSocket.java:73) ~[atmosphere-runtime-3.0.5.slf4jvaadin1.jar:3.0.5.slf4jvaadin1]
at org.atmosphere.websocket.WebSocket.write(WebSocket.java:261) ~[atmosphere-runtime-3.0.5.slf4jvaadin1.jar:3.0.5.slf4jvaadin1]
at org.atmosphere.websocket.WebSocket.write(WebSocket.java:227) ~[atmosphere-runtime-3.0.5.slf4jvaadin1.jar:3.0.5.slf4jvaadin1]
at org.atmosphere.websocket.WebSocket.write(WebSocket.java:48) ~[atmosphere-runtime-3.0.5.slf4jvaadin1.jar:3.0.5.slf4jvaadin1]
at org.atmosphere.cpr.AtmosphereResponseImpl$Stream.write(AtmosphereResponseImpl.java:955) ~[atmosphere-runtime-3.0.5.slf4jvaadin1.jar:3.0.5.slf4jvaadin1]
at org.atmosphere.handler.AbstractReflectorAtmosphereHandler.onStateChange(AbstractReflectorAtmosphereHandler.java:154) ~[atmosphere-runtime-3.0.5.slf4jvaadin1.jar:3.0.5.slf4jvaadin1]
at com.vaadin.flow.server.communication.PushAtmosphereHandler.onStateChange(PushAtmosphereHandler.java:54) ~[flow-server-25.1.10.jar:25.1.10]
at org.atmosphere.cpr.AsynchronousProcessor.invokeAtmosphereHandler(AsynchronousProcessor.java:538) ~[atmosphere-runtime-3.0.5.slf4jvaadin1.jar:3.0.5.slf4jvaadin1]
at org.atmosphere.cpr.AsynchronousProcessor.completeLifecycle(AsynchronousProcessor.java:480) ~[atmosphere-runtime-3.0.5.slf4jvaadin1.jar:3.0.5.slf4jvaadin1]
at org.atmosphere.cpr.AsynchronousProcessor.endRequest(AsynchronousProcessor.java:584) ~[atmosphere-runtime-3.0.5.slf4jvaadin1.jar:3.0.5.slf4jvaadin1]
at org.atmosphere.websocket.DefaultWebSocketProcessor.executeClose(DefaultWebSocketProcessor.java:689) ~[atmosphere-runtime-3.0.5.slf4jvaadin1.jar:3.0.5.slf4jvaadin1]
at org.atmosphere.websocket.DefaultWebSocketProcessor.close(DefaultWebSocketProcessor.java:635) ~[atmosphere-runtime-3.0.5.slf4jvaadin1.jar:3.0.5.slf4jvaadin1]
at org.atmosphere.container.JSR356Endpoint.onClose(JSR356Endpoint.java:318) ~[atmosphere-runtime-3.0.5.slf4jvaadin1.jar:3.0.5.slf4jvaadin1]
at org.apache.tomcat.websocket.WsSession.fireEndpointOnClose(WsSession.java:718) ~[tomcat-websocket.jar:11.0.22]
at org.apache.tomcat.websocket.WsSession.onClose(WsSession.java:626) ~[tomcat-websocket.jar:11.0.22]
at org.apache.tomcat.websocket.WsFrameBase.processDataControl(WsFrameBase.java:349) ~[tomcat-websocket.jar:11.0.22]
at org.apache.tomcat.websocket.WsFrameBase.processData(WsFrameBase.java:281) ~[tomcat-websocket.jar:11.0.22]
at org.apache.tomcat.websocket.WsFrameBase.processInputBuffer(WsFrameBase.java:129) ~[tomcat-websocket.jar:11.0.22]
at org.apache.tomcat.websocket.server.WsFrameServer.onDataAvailable(WsFrameServer.java:85) ~[tomcat-websocket.jar:11.0.22]
at org.apache.tomcat.websocket.server.WsFrameServer.doOnDataAvailable(WsFrameServer.java:184) ~[tomcat-websocket.jar:11.0.22]
at org.apache.tomcat.websocket.server.WsFrameServer.notifyDataAvailable(WsFrameServer.java:164) ~[tomcat-websocket.jar:11.0.22]
at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler.upgradeDispatch(WsHttpUpgradeHandler.java:152) ~[tomcat-websocket.jar:11.0.22]
at org.apache.coyote.http11.upgrade.UpgradeProcessorInternal.dispatch(UpgradeProcessorInternal.java:60) ~[tomcat-coyote.jar:11.0.22]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:57) ~[tomcat-coyote.jar:11.0.22]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:1272) ~[tomcat-coyote.jar:11.0.22]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1801) ~[tomcat-coyote.jar:11.0.22]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) ~[tomcat-coyote.jar:11.0.22]
at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:946) ~[tomcat-util.jar:11.0.22]
at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:480) ~[tomcat-util.jar:11.0.22]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:57) ~[tomcat-util.jar:11.0.22]
at java.base/java.lang.Thread.run(Unknown Source) ~[na:na]
I would like to ask others if they ever encountered this exception, what might be the cause of this and if there is anything I can do to increase quality of my application to prevent this exception from rising?
I am building Vaadin 25.1.7 application with Spring-boot 4.0.7 deployed as .war file behind an nginx reverse proxy 1.30.2 with push mode being WEBSOCKETS_XHR, using HTTP 1.1 with tomcat 11. Nginx is configured properly for vaadin websocket connections by official docs.
Altough there are no user reported problems and it seems harmless, I still would like to fix it :) Thanks.
I have one demo docker cluster with nginx, and I have somewhat different settings, your proxy_connect_timeout might be too short. I.e. it might need some grace.
I have not found original exception message and type again, however, there is another exception occuring several times during application runtime:
java.io.IOException: The response may not be written to once it has been closed
at org.apache.catalina.connector.OutputBuffer.writeBytes(OutputBuffer.java:360)
at org.apache.catalina.connector.OutputBuffer.write(OutputBuffer.java:341)
at org.apache.catalina.connector.CoyoteOutputStream.write(CoyoteOutputStream.java:99)
at com.vaadin.flow.server.communication.TransferUtil.transfer(TransferUtil.java:103)
at com.vaadin.flow.server.streams.InputStreamDownloadHandler.handleDownloadRequest(InputStreamDownloadHandler.java:102)
at com.vaadin.flow.server.streams.DownloadHandler$1.handleDownloadRequest(DownloadHandler.java:139)
at com.vaadin.flow.server.streams.DownloadHandler.handleRequest(DownloadHandler.java:103)
at com.vaadin.flow.server.communication.StreamRequestHandler.callElementResourceHandler(StreamRequestHandler.java:194)
at com.vaadin.flow.server.communication.StreamRequestHandler.handleRequest(StreamRequestHandler.java:119)
at com.vaadin.flow.server.VaadinService.handleRequest(VaadinService.java:1835)
at com.vaadin.flow.server.VaadinServlet.service(VaadinServlet.java:402)
at com.vaadin.flow.spring.SpringServlet.service(SpringServlet.java:106)
at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:710)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:128)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:513)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:333)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:262)
at org.springframework.web.servlet.mvc.ServletForwardingController.handleRequestInternal(ServletForwardingController.java:139)
at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:177)
at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:49)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:866)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1000)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:892)
at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:622)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:874)
at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:710)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:128)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107)
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:199)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:165)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:77)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:492)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:113)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:83)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:782)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:72)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:341)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:397)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:1272)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1801)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)
at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:946)
at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:480)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:57)
at java.base/java.lang.Thread.run(Unknown Source)
Might the proxy_connect_timeout of 130s be too high in some scenarios? I mean, I know there is not much I can do about this kind of messages, even with precise tweaking and configuration there could be some timeouts in some cases.