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vaadin / flow

Vaadin Flow is a Java framework binding Vaadin web components to Java. This is part of Vaadin 10+.
Apache License 2.0
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NPE in VaadinService.java:1480 (flow-server-2.4.3.jar) #9579

Open realulim opened 3 years ago

realulim commented 3 years ago

Description of the bug / feature

When I subject Vaadin to a mild dose of load (via running a Selenium Test Suite) I am getting occasional NullPointerExceptions, which translate to the UI not responding to the user action.

While I am not sure about the underlying issue, at least the NPE should be fixed in Vaadin.

Minimal reproducible example

Put any Vaadin 14.4.* application with Spring and Spring Security under stress. The error mostly appears upon trying to login. Example: https://github.com/realulim/vaadin-reproducer

Expected behavior

A reasonable error message should be produced that gives a bit more detail on the possible cause.

Actual behavior

A NullPointerException is thrown (see attached stacktrace)

Versions:

- Vaadin / Flow version: I have reproduced with 14.4.0 to 14.4.4
- Java version: 1.8
- OS version: Fedora 29, but also reproduced with CentOS 7
- Browser version (if applicable): Firefox / Chrome newest versions
- Application Server: Spring Boot 2.3.6 (was not able to reproduce with 2.4.0)
java.io.IOException: Broken pipe
    at sun.nio.ch.FileDispatcherImpl.writev0(Native Method) ~[na:1.8.0_232]
    at sun.nio.ch.SocketDispatcher.writev(SocketDispatcher.java:51) ~[na:1.8.0_232]
    at sun.nio.ch.IOUtil.write(IOUtil.java:148) ~[na:1.8.0_232]
    at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:504) ~[na:1.8.0_232]
    at org.xnio.nio.NioSocketConduit.write(NioSocketConduit.java:162) ~[xnio-nio-3.8.0.Final.jar:3.8.0.Final]
    at io.undertow.server.protocol.http.HttpResponseConduit.write(HttpResponseConduit.java:655) ~[undertow-core-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.conduits.ChunkedStreamSinkConduit.doWrite(ChunkedStreamSinkConduit.java:166) ~[undertow-core-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.conduits.ChunkedStreamSinkConduit.write(ChunkedStreamSinkConduit.java:128) ~[undertow-core-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.conduits.ChunkedStreamSinkConduit.write(ChunkedStreamSinkConduit.java:219) ~[undertow-core-2.1.4.Final.jar:2.1.4.Final]
    at org.xnio.conduits.ConduitStreamSinkChannel.write(ConduitStreamSinkChannel.java:158) ~[xnio-api-3.8.0.Final.jar:3.8.0.Final]
    at io.undertow.channels.DetachableStreamSinkChannel.write(DetachableStreamSinkChannel.java:179) ~[undertow-core-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.server.HttpServerExchange$WriteDispatchChannel.write(HttpServerExchange.java:2082) ~[undertow-core-2.1.4.Final.jar:2.1.4.Final]
    at org.xnio.channels.Channels.writeBlocking(Channels.java:202) ~[xnio-api-3.8.0.Final.jar:3.8.0.Final]
    at io.undertow.servlet.spec.ServletOutputStreamImpl.writeTooLargeForBuffer(ServletOutputStreamImpl.java:199) ~[undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.spec.ServletOutputStreamImpl.write(ServletOutputStreamImpl.java:147) ~[undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at org.springframework.security.web.util.OnCommittedResponseWrapper$SaveContextServletOutputStream.write(OnCommittedResponseWrapper.java:645) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.util.OnCommittedResponseWrapper$SaveContextServletOutputStream.write(OnCommittedResponseWrapper.java:645) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at sun.nio.cs.StreamEncoder.writeBytes(StreamEncoder.java:221) ~[na:1.8.0_232]
    at sun.nio.cs.StreamEncoder.implWrite(StreamEncoder.java:282) ~[na:1.8.0_232]
    at sun.nio.cs.StreamEncoder.write(StreamEncoder.java:125) ~[na:1.8.0_232]
    at java.io.OutputStreamWriter.write(OutputStreamWriter.java:207) ~[na:1.8.0_232]
    at java.io.BufferedWriter.flushBuffer(BufferedWriter.java:129) ~[na:1.8.0_232]
    at java.io.BufferedWriter.write(BufferedWriter.java:230) ~[na:1.8.0_232]
    at java.io.Writer.write(Writer.java:157) ~[na:1.8.0_232]
    at java.io.Writer.append(Writer.java:227) ~[na:1.8.0_232]
    at com.vaadin.flow.server.BootstrapHandler.writeBootstrapPage(BootstrapHandler.java:493) ~[flow-server-2.4.3.jar:2.4.3]
    at com.vaadin.flow.server.BootstrapHandler.synchronizedHandleRequest(BootstrapHandler.java:482) ~[flow-server-2.4.3.jar:2.4.3]
    at com.vaadin.flow.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:40) ~[flow-server-2.4.3.jar:2.4.3]
    at com.vaadin.flow.server.VaadinService.handleRequest(VaadinService.java:1545) ~[flow-server-2.4.3.jar:2.4.3]
    at com.vaadin.flow.server.VaadinServlet.service(VaadinServlet.java:247) [flow-server-2.4.3.jar:2.4.3]
    at com.vaadin.flow.spring.SpringServlet.service(SpringServlet.java:111) [vaadin-spring-12.3.2.jar:na]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:584) [jakarta.servlet-api-4.0.4.jar:4.0.4]
    at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:74) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.ServletChain$1.handleRequest(ServletChain.java:68) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.RedirectDirHandler.handleRequest(RedirectDirHandler.java:68) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:251) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.ServletInitialHandler.dispatchToServlet(ServletInitialHandler.java:196) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.spec.RequestDispatcherImpl.forwardImpl(RequestDispatcherImpl.java:225) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.spec.RequestDispatcherImpl.forwardImplSetup(RequestDispatcherImpl.java:149) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.spec.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:111) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at org.springframework.web.servlet.mvc.ServletForwardingController.handleRequestInternal(ServletForwardingController.java:141) [spring-webmvc-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:177) [spring-webmvc-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:52) [spring-webmvc-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040) [spring-webmvc-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) [spring-webmvc-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) [spring-webmvc-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) [spring-webmvc-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:497) [jakarta.servlet-api-4.0.4.jar:4.0.4]
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) [spring-webmvc-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:584) [jakarta.servlet-api-4.0.4.jar:4.0.4]
    at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:74) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.websockets.jsr.JsrWebSocketFilter.doFilter(JsrWebSocketFilter.java:173) [undertow-websockets-jsr-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:320) [spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:126) [spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:90) [spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:118) [spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137) [spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111) [spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:158) [spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63) [spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:200) [spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116) [spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:92) [spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:77) [spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105) [spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56) [spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) [spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:215) [spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178) [spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:358) [spring-web-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:271) [spring-web-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) [spring-web-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) [spring-web-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) [spring-web-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.ServletChain$1.handleRequest(ServletChain.java:68) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.RedirectDirHandler.handleRequest(RedirectDirHandler.java:68) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:132) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46) [undertow-core-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60) [undertow-core-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43) [undertow-core-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:269) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:78) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:133) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:130) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:249) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:78) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:99) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.server.Connectors.executeRootHandler(Connectors.java:370) [undertow-core-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:836) [undertow-core-2.1.4.Final.jar:2.1.4.Final]
    at org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35) [jboss-threads-3.1.0.Final.jar:3.1.0.Final]
    at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:2019) [jboss-threads-3.1.0.Final.jar:3.1.0.Final]
    at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1558) [jboss-threads-3.1.0.Final.jar:3.1.0.Final]
    at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1449) [jboss-threads-3.1.0.Final.jar:3.1.0.Final]
    at java.lang.Thread.run(Thread.java:748) [na:1.8.0_232]
    Suppressed: java.io.IOException: UT010029: Stream is closed
        at io.undertow.servlet.spec.ServletOutputStreamImpl.write(ServletOutputStreamImpl.java:138) ~[undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
        at org.springframework.security.web.util.OnCommittedResponseWrapper$SaveContextServletOutputStream.write(OnCommittedResponseWrapper.java:645) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
        at org.springframework.security.web.util.OnCommittedResponseWrapper$SaveContextServletOutputStream.write(OnCommittedResponseWrapper.java:645) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
        at sun.nio.cs.StreamEncoder.writeBytes(StreamEncoder.java:221) ~[na:1.8.0_232]
        at sun.nio.cs.StreamEncoder.implClose(StreamEncoder.java:316) ~[na:1.8.0_232]
        at sun.nio.cs.StreamEncoder.close(StreamEncoder.java:149) ~[na:1.8.0_232]
        at java.io.OutputStreamWriter.close(OutputStreamWriter.java:233) ~[na:1.8.0_232]
        at java.io.BufferedWriter.close(BufferedWriter.java:266) ~[na:1.8.0_232]
        at com.vaadin.flow.server.BootstrapHandler.writeBootstrapPage(BootstrapHandler.java:494) ~[flow-server-2.4.3.jar:2.4.3]
        ... 109 common frames omitted

2020-12-04 18:34:04.332 ERROR 13146 --- [  XNIO-1 task-5] io.undertow.request                      : UT005023: Exception handling request to /

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.RuntimeException: java.lang.NullPointerException
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014) ~[spring-webmvc-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:497) ~[jakarta.servlet-api-4.0.4.jar:4.0.4]
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:584) ~[jakarta.servlet-api-4.0.4.jar:4.0.4]
    at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:74) ~[undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129) ~[undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.websockets.jsr.JsrWebSocketFilter.doFilter(JsrWebSocketFilter.java:173) ~[undertow-websockets-jsr-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) ~[undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) ~[undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:320) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:126) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:90) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:118) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:158) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:200) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:92) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:77) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:215) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178) ~[spring-security-web-5.3.5.RELEASE.jar:5.3.5.RELEASE]
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:358) ~[spring-web-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:271) ~[spring-web-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) ~[undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) ~[undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) ~[undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) ~[undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) ~[undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) ~[undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) ~[undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) ~[undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84) ~[undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62) ~[undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.ServletChain$1.handleRequest(ServletChain.java:68) ~[undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36) ~[undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.RedirectDirHandler.handleRequest(RedirectDirHandler.java:68) ~[undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:132) ~[undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57) ~[undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) ~[undertow-core-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46) ~[undertow-core-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64) ~[undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60) ~[undertow-core-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77) ~[undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43) ~[undertow-core-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) ~[undertow-core-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) ~[undertow-core-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:269) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:78) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:133) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:130) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:249) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:78) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:99) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.server.Connectors.executeRootHandler(Connectors.java:370) [undertow-core-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:836) [undertow-core-2.1.4.Final.jar:2.1.4.Final]
    at org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35) [jboss-threads-3.1.0.Final.jar:3.1.0.Final]
    at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:2019) [jboss-threads-3.1.0.Final.jar:3.1.0.Final]
    at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1558) [jboss-threads-3.1.0.Final.jar:3.1.0.Final]
    at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1449) [jboss-threads-3.1.0.Final.jar:3.1.0.Final]
    at java.lang.Thread.run(Thread.java:748) [na:1.8.0_232]
Caused by: java.lang.RuntimeException: java.lang.NullPointerException
    at io.undertow.servlet.spec.RequestDispatcherImpl.forwardImpl(RequestDispatcherImpl.java:251) ~[undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.spec.RequestDispatcherImpl.forwardImplSetup(RequestDispatcherImpl.java:149) ~[undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.spec.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:111) ~[undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at org.springframework.web.servlet.mvc.ServletForwardingController.handleRequestInternal(ServletForwardingController.java:141) ~[spring-webmvc-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:177) ~[spring-webmvc-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:52) ~[spring-webmvc-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040) ~[spring-webmvc-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) ~[spring-webmvc-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.2.11.RELEASE.jar:5.2.11.RELEASE]
    ... 85 common frames omitted
Caused by: java.lang.NullPointerException: null
    at com.vaadin.flow.server.VaadinService.requestEnd(VaadinService.java:1480) ~[flow-server-2.4.3.jar:2.4.3]
    at com.vaadin.flow.server.VaadinService.handleRequest(VaadinService.java:1559) ~[flow-server-2.4.3.jar:2.4.3]
    at com.vaadin.flow.server.VaadinServlet.service(VaadinServlet.java:247) ~[flow-server-2.4.3.jar:2.4.3]
    at com.vaadin.flow.spring.SpringServlet.service(SpringServlet.java:111) ~[vaadin-spring-12.3.2.jar:na]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:584) ~[jakarta.servlet-api-4.0.4.jar:4.0.4]
    at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:74) ~[undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62) ~[undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.ServletChain$1.handleRequest(ServletChain.java:68) ~[undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36) ~[undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.RedirectDirHandler.handleRequest(RedirectDirHandler.java:68) ~[undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) ~[undertow-core-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) ~[undertow-core-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:251) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.handlers.ServletInitialHandler.dispatchToServlet(ServletInitialHandler.java:196) [undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    at io.undertow.servlet.spec.RequestDispatcherImpl.forwardImpl(RequestDispatcherImpl.java:225) ~[undertow-servlet-2.1.4.Final.jar:2.1.4.Final]
    ... 93 common frames omitted
taefi commented 3 years ago

Hi @realulim, thanks for issuing this, would you please be so kind and upload/share your reproducible example with us?

realulim commented 3 years ago

Here it is: https://github.com/realulim/vaadin-reproducer I have included a Selenide test that just keeps on repeating itself (Login/Logout of Application) until the error occurs. You can follow the progress of the test by reloading build/report/extent/index.html. Sometimes it will take more than 100 iterations of the test, but most of the time the error will occur within 30 iterations. Start the test with the gradle task "uiTest".

realulim commented 3 years ago

So, are you reproducing this?

mvysny commented 3 years ago

Either request is null, or request.getAttribute(REQUEST_START_TIME_ATTRIBUTE) is null, however neither should be null since the attribute is set in VaadinService.requestStart(). However, one of those clearly is; my bet is on the attribute.

You can shadow VaadinService with a project-copy of that class, and modify the requestEnd() function to print to stdout what exactly is null. That would give us more insight on what's wrong.

realulim commented 3 years ago

Whichever of the two it is, the root cause is almost certainly a race condition, because it only happens occasionally and under load. I think there's some potential for it causing problems in hard-to-debug production setups. Seeing that the code is 8 years old, without any null-checks and under-tested, this is one for the head surgeon :)