Hi, I can reproduce the problem, but don't know yet what is causing this.
What I can see is that the page is properly locked when being accessed via Ajax or via a web socket push.
Thus a concurrent modification should not occur. I'll have to investigate further. Have fun Sven On 20.05.20 09:59, fanfy wrote:
Hello, Maybe you can help me with a problem related to wicket 8.8.0 with websocket. Sometimes (usually when there are many ajax request in a short time interval) I encounter ConcurrentModificationException. The page store saving is synchronous. I created a sample project (attached websocket-test.tar <http://apache-wicket.1842946.n4.nabble.com/file/t375849/websocket-test.tar> ) mvn package java -jar target/websocket-test-0.0.1-SNAPSHOT.jar http://localhost:8080/) If clicking multiple times on 'New message' AjaxLink soon the exception is thrown. Internally I have a timer that creates messages on 50 milliseconds frequency (may be changed in src/main/resources/application.properties - fanfy.messsage-generator-frequency=50) Below is a sample stacktrace. Thank you. 2020-05-20 10:43:55.241 ERROR 246999 --- [nio-8080-exec-1] o.apache.wicket.DefaultExceptionMapper : Unexpected error occurred java.util.ConcurrentModificationException: null at org.apache.commons.collections4.map.AbstractLinkedMap$LinkIterator.nextEntry(AbstractLinkedMap.java:574) ~[commons-collections4-4.4.jar!/:4.4] at org.apache.commons.collections4.map.AbstractLinkedMap$ValuesIterator.next(AbstractLinkedMap.java:506) ~[commons-collections4-4.4.jar!/:4.4] at org.apache.wicket.MarkupContainer$1MarkupChildIterator.refreshInternalIteratorIfNeeded(MarkupContainer.java:624) ~[wicket-core-8.8.0.jar!/:8.8.0] at org.apache.wicket.MarkupContainer$1MarkupChildIterator.hasNext(MarkupContainer.java:573) ~[wicket-core-8.8.0.jar!/:8.8.0] at org.apache.wicket.util.visit.Visits.visitChildren(Visits.java:134) ~[wicket-util-8.8.0.jar!/:8.8.0] at org.apache.wicket.util.visit.Visits.visitChildren(Visits.java:162) ~[wicket-util-8.8.0.jar!/:8.8.0] at org.apache.wicket.util.visit.Visits.visitChildren(Visits.java:162) ~[wicket-util-8.8.0.jar!/:8.8.0] at org.apache.wicket.util.visit.Visits.visitChildren(Visits.java:162) ~[wicket-util-8.8.0.jar!/:8.8.0] at org.apache.wicket.util.visit.Visits.visitChildren(Visits.java:123) ~[wicket-util-8.8.0.jar!/:8.8.0] at org.apache.wicket.util.visit.Visits.visitChildren(Visits.java:192) ~[wicket-util-8.8.0.jar!/:8.8.0] at org.apache.wicket.MarkupContainer.visitChildren(MarkupContainer.java:976) ~[wicket-core-8.8.0.jar!/:8.8.0] at org.apache.wicket.ComponentEventSender.breadth(ComponentEventSender.java:160) ~[wicket-core-8.8.0.jar!/:8.8.0] at org.apache.wicket.ComponentEventSender.send(ComponentEventSender.java:68) ~[wicket-core-8.8.0.jar!/:8.8.0] at org.apache.wicket.Component.send(Component.java:4413) ~[wicket-core-8.8.0.jar!/:8.8.0] at org.apache.wicket.ajax.AjaxRequestHandler.respond(AjaxRequestHandler.java:349) ~[wicket-core-8.8.0.jar!/:8.8.0] at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:914) ~[wicket-core-8.8.0.jar!/:8.8.0] at org.apache.wicket.request.RequestHandlerExecutor.execute(RequestHandlerExecutor.java:65) ~[wicket-request-8.8.0.jar!/:8.8.0] at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:282) [wicket-core-8.8.0.jar!/:8.8.0] at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:253) [wicket-core-8.8.0.jar!/:8.8.0] at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:221) [wicket-core-8.8.0.jar!/:8.8.0] at org.apache.wicket.protocol.ws.AbstractUpgradeFilter.processRequestCycle(AbstractUpgradeFilter.java:70) [wicket-native-websocket-core-8.8.0.jar!/:8.8.0] at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:206) [wicket-core-8.8.0.jar!/:8.8.0] at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:299) [wicket-core-8.8.0.jar!/:8.8.0] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.35.jar!/:9.0.35] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.35.jar!/:9.0.35] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) [tomcat-embed-core-9.0.35.jar!/:9.0.35] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-9.0.35.jar!/:9.0.35] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) [tomcat-embed-core-9.0.35.jar!/:9.0.35] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [tomcat-embed-core-9.0.35.jar!/:9.0.35] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.35.jar!/:9.0.35] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.35.jar!/:9.0.35] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.35.jar!/:9.0.35] at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373) [tomcat-embed-core-9.0.35.jar!/:9.0.35] at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.35.jar!/:9.0.35] at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) [tomcat-embed-core-9.0.35.jar!/:9.0.35] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590) [tomcat-embed-core-9.0.35.jar!/:9.0.35] at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.35.jar!/:9.0.35] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_252] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_252] at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.35.jar!/:9.0.35] at java.lang.Thread.run(Thread.java:748) [na:1.8.0_252] Exception in thread "Timer-0" java.lang.IllegalStateException: Message will not be sent because the WebSocket session has been closed at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.writeMessagePart(WsRemoteEndpointImplBase.java:430) at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.sendMessageBlock(WsRemoteEndpointImplBase.java:309) at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.sendMessageBlock(WsRemoteEndpointImplBase.java:250) at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.sendString(WsRemoteEndpointImplBase.java:191) at org.apache.tomcat.websocket.WsRemoteEndpointBasic.sendText(WsRemoteEndpointBasic.java:37) at org.apache.wicket.protocol.ws.javax.JavaxWebSocketConnection.sendMessage(JavaxWebSocketConnection.java:81) at org.apache.wicket.protocol.ws.api.WebSocketResponse.close(WebSocketResponse.java:92) at org.apache.wicket.protocol.ws.api.AbstractWebSocketProcessor.broadcastMessage(AbstractWebSocketProcessor.java:287) at org.apache.wicket.protocol.ws.api.AbstractWebSocketConnection.sendMessage(AbstractWebSocketConnection.java:43) at fanfy.websocket.service.impl.MessageServiceImpl.broadcastWebSocketMessage(MessageServiceImpl.java:81) at fanfy.websocket.service.impl.MessageServiceImpl.addMessage(MessageServiceImpl.java:48) at fanfy.websocket.service.impl.MessageServiceImpl$1.run(MessageServiceImpl.java:59) at java.util.TimerThread.mainLoop(Timer.java:555) at java.util.TimerThread.run(Timer.java:505) -- Sent from: http://apache-wicket.1842946.n4.nabble.com/Users-forum-f1842947.html --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org For additional commands, e-mail: users-h...@wicket.apache.org
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