Internal Error: Exception in rendering component

Classic Servoy
1

After closing a dialog drawn over a table view, I get an internal error (webclient), does anybody have an idea why?

org.apache.wicket.WicketRuntimeException: Exception in rendering component: [MarkupContainer [Component id = rowsContainerBody]] 
    	at org.apache.wicket.Component.renderComponent(Component.java:2764) 
    	at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1559) 
    	at org.apache.wicket.Component.render(Component.java:2525) 
    	at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1461) 
    	at org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.java:1624) 
    	at org.apache.wicket.MarkupContainer.onComponentTagBody(MarkupContainer.java:1548) 
    	at org.apache.wicket.Component.renderComponent(Component.java:2725) 
    	at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1559) 
    	at com.servoy.j2db.server.headlessclient.dataui.WebCellBasedView.onRender(WebCellBasedView.java:2890) 
    	at org.apache.wicket.Component.render(Component.java:2525) 
    	at org.apache.wicket.Component.renderComponent(Component.java:2666) 
    	at org.apache.wicket.ajax.AjaxRequestTarget.respondComponent(AjaxRequestTarget.java:876) 
    	at org.apache.wicket.ajax.AjaxRequestTarget.respondComponents(AjaxRequestTarget.java:680) 
    	at org.apache.wicket.ajax.AjaxRequestTarget.respond(AjaxRequestTarget.java:590) 
    	at org.apache.wicket.request.AbstractRequestCycleProcessor.respond(AbstractRequestCycleProcessor.java:105) 
    	at com.servoy.j2db.server.headlessclient.WebClientsApplication$8.respond(WebClientsApplication.java:708) 
    	at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1287) 
    	at org.apache.wicket.RequestCycle.step(RequestCycle.java:1358) 
    	at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1465) 
    	at org.apache.wicket.RequestCycle.request(RequestCycle.java:545) 
    	at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:486) 
    	at com.servoy.j2db.server.servlets.Zt.doGet(Zt.java:16) 
    	at org.apache.wicket.protocol.http.WicketServlet.doGet(WicketServlet.java:138) 
    	at javax.servlet.http.HttpServlet.service(HttpServlet.java:617) 
    	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 
    	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) 
    	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) 
    	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) 
    	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) 
    	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) 
    	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:615) 
    	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) 
    	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293) 
    	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861) 
    	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:606) 
    	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) 
    	at java.lang.Thread.run(Unknown Source) 
    Caused by: java.lang.IllegalStateException: the render iterator returned null for a child 
    	at org.apache.wicket.markup.repeater.AbstractRepeater.onRender(AbstractRepeater.java:100) 
    	at org.apache.wicket.Component.render(Component.java:2525) 
    	at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1461) 
    	at org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.java:1624) 
    	at org.apache.wicket.MarkupContainer.onComponentTagBody(MarkupContainer.java:1548) 
    	at org.apache.wicket.Component.renderComponent(Component.java:2725) 
    	... 37 more
2

this seems some weird multi threaded access which should not really happen.
somehow its rendering a page that is maybe closed or cleanup at the same time

If you have something reproducible make a case with that sample

3

Hi Johan,
I can reproduce it 100% but the setup is very complicated. See the screenshot.
What’s happening is that I’m importing data from CSV in a form in dialog, the user clicks the “finish button” and when the import is complete the data should be shown in the underlying tab panel “Selected Items” and the dialog is closed, it’s then that the client crashes. Looks like the problem is redrawing the tab panel while hiding the form in dialog.

Any idea?

Screen Shot 2015-02-26 at 18.12.37.png
Screen Shot 2015-02-26 at 18.12.37.png1392×932 76.9 KB

4

I confirm the previous post: if I switch to the second tab before showing the FID it works nicely. Should I create a case?