org.apache.wicket.WicketRuntimeException: Error attaching this container for rendering: [Form [Component id = form]]

There are no available Samebug tips for this exception. Do you have an idea how to solve this issue? A short tip would help users who saw this issue last week.

  • GitHub comment 3274#250586056
    via GitHub by kyleblythe
    ,
    • org.apache.wicket.WicketRuntimeException: Error attaching this container for rendering: [Form [Component id = form]] at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1696) at org.apache.wicket.Component.onBeforeRender(Component.java:3826) at org.apache.wicket.markup.html.form.Form.onBeforeRender(Form.java:1784) at org.apache.wicket.Component.internalBeforeRender(Component.java:949) at org.apache.wicket.Component.beforeRender(Component.java:1017) at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1684) at org.apache.wicket.Component.onBeforeRender(Component.java:3826) at org.apache.wicket.Component.internalBeforeRender(Component.java:949) at org.apache.wicket.Component.beforeRender(Component.java:1017) at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1684) at org.apache.wicket.Component.onBeforeRender(Component.java:3826) at org.apache.wicket.Page.onBeforeRender(Page.java:809) at org.apache.wicket.Component.internalBeforeRender(Component.java:949) at org.apache.wicket.Component.beforeRender(Component.java:1017) at org.apache.wicket.Component.internalPrepareForRender(Component.java:2194) at org.apache.wicket.Page.internalPrepareForRender(Page.java:240) at org.apache.wicket.Component.render(Component.java:2283) at org.apache.wicket.Page.renderPage(Page.java:1024) at org.apache.wicket.request.handler.render.WebPageRenderer.renderPage(WebPageRenderer.java:139) at org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:229) at org.apache.wicket.core.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:175) at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:862) at org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64) at org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:97) at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:261) at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:218) at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:289) at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:259) at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:201) at org.apache.wicket.protocol.http.WicketServlet.doPost(WicketServlet.java:159) at javax.servlet.http.HttpServlet.service(HttpServlet.java:648) at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.sakaiproject.util.RequestFilter.doFilter(RequestFilter.java:411) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:721) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:466) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:358) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:318) at org.sakaiproject.tool.impl.ActiveToolComponent$MyActiveTool.forward(ActiveToolComponent.java:513) at org.sakaiproject.portal.charon.SkinnableCharonPortal.forwardTool(SkinnableCharonPortal.java:1482) at org.sakaiproject.portal.charon.handlers.SiteHandler.doToolBuffer(SiteHandler.java:1154) at org.sakaiproject.portal.charon.handlers.SiteHandler.bufferContent(SiteHandler.java:1010) at org.sakaiproject.portal.charon.handlers.SiteHandler.doSite(SiteHandler.java:484) at org.sakaiproject.portal.charon.handlers.SiteHandler.doGet(SiteHandler.java:263) at org.sakaiproject.portal.charon.handlers.SiteHandler.doGet(SiteHandler.java:151) at org.sakaiproject.portal.charon.handlers.WorksiteHandler.doPost(WorksiteHandler.java:71) at org.sakaiproject.portal.charon.SkinnableCharonPortal.doPost(SkinnableCharonPortal.java:1158) at javax.servlet.http.HttpServlet.service(HttpServlet.java:648) at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.sakaiproject.util.RequestFilter.doFilter(RequestFilter.java:460) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:617) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:668) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1521) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1478) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.NullPointerException at org.sakaiproject.gradebookng.tool.panels.importExport.GradeItemImportSelectionStep$6.populateItem(GradeItemImportSelectionStep.java:296) at org.apache.wicket.markup.html.list.ListView.onPopulate(ListView.java:523) at org.apache.wicket.markup.repeater.AbstractRepeater.onBeforeRender(AbstractRepeater.java:123) at org.apache.wicket.Component.internalBeforeRender(Component.java:949) at org.apache.wicket.Component.beforeRender(Component.java:1017) at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1684)
    No Bugmate found.