Hello, I'm facing weird "Cannot modify component hierarchy after render phase has started" exception on simultaneous page access using 2 different browsers everything works in case there is only one browser, or page being accessed not "simultaneously"
We are using "single page" application, with async updates via AjaxBehaviours and WebSockets Maybe you can propose how to debug this? Wicket 8.8.8-SNAPSHOT Tomcat 8.5.12 Here is the stack trace: org.apache.wicket.WicketRuntimeException: Cannot modify component hierarchy after render phase has started (page version cant change then anymore) at org.apache.wicket.Component.checkHierarchyChange(Component.java:3649) at org.apache.wicket.MarkupContainer.remove(MarkupContainer.java:685) at org.apache.wicket.MarkupContainer.addedComponent(MarkupContainer.java:990) at org.apache.wicket.MarkupContainer.add(MarkupContainer.java:239) at org.apache.openmeetings.web.common.MainPanel.onInitialize(MainPanel.java:151) at org.apache.wicket.Component.fireInitialize(Component.java:878) at org.apache.wicket.MarkupContainer.internalInitialize(MarkupContainer.java:1037) at org.apache.wicket.MarkupContainer.addedComponent(MarkupContainer.java:1014) at org.apache.wicket.MarkupContainer.add(MarkupContainer.java:239) at org.apache.openmeetings.web.pages.MainPage.onInitialize(MainPage.java:52) at org.apache.wicket.Component.fireInitialize(Component.java:878) at org.apache.wicket.MarkupContainer.internalInitialize(MarkupContainer.java:1037) at org.apache.wicket.Page.isPageStateless(Page.java:459) at org.apache.wicket.request.handler.render.WebPageRenderer.isPageStateless(WebPageRenderer.java:287) at org.apache.wicket.request.handler.render.WebPageRenderer.shouldRenderPageAndWriteResponse(WebPageRenderer.java:333) at org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:193) at org.apache.wicket.core.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:202) at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:912) at org.apache.wicket.request.RequestHandlerExecutor.execute(RequestHandlerExecutor.java:65) at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:283) at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:253) at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:221) at org.apache.wicket.protocol.ws.AbstractUpgradeFilter.processRequestCycle(AbstractUpgradeFilter.java:70) at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:204) at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:286) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) at org.red5.logging.LoggerContextFilter.doFilter(LoggerContextFilter.java:84) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:595) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:624) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:341) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:783) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:798) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1441) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:748) -- WBR Maxim aka solomax
