Thanks for you reply. Included more codes below. Code for PrescientTemplateOriginalPage below package org.possible.bug;
import org.apache.wicket.markup.html.WebPage; import org.apache.wicket.markup.html.basic.Label; import org.apache.wicket.model.Model; /** * * @author oyeso */ public class PrescientTemplateOriginalPage extends WebPage { private final String footerId="footerPanel"; private final String headerId="headerPanel"; private FooterPanel footer; private HeaderPanel header; public PrescientTemplateOriginalPage() { this.header = new HeaderPanel(headerId); this.footer = new FooterPanel(footerId); add(header); add(footer); } public PrescientTemplateOriginalPage( FooterPanel footer, HeaderPanel header) { this.footer = footer; this.header = header; } } Code for HeaderPanel below import org.apache.wicket.Component; import org.apache.wicket.MarkupContainer; import org.apache.wicket.behavior.Behavior; import org.apache.wicket.markup.html.basic.Label; import org.apache.wicket.markup.html.image.Image; import org.apache.wicket.markup.html.panel.Panel; import org.apache.wicket.model.Model; public class HeaderPanel extends Panel{ private Label header; private Image imgHeader; public HeaderPanel(String id) { super(id); header=new Label("prescientDoctorsLabel",Model.of("Prescient Doctors") ); add(header); } } Code for FooterPanel Below import org.apache.wicket.markup.html.basic.Label; import org.apache.wicket.markup.html.panel.Panel; import org.apache.wicket.model.Model; public class FooterPanel extends Panel{ public FooterPanel(String id) { super(id); add(new Label("footerLabel",Model.of("Footer Label Here"))); } } Code for PrecientHome below package org.possible.bug; import java.io.IOException; import java.util.List; import java.util.logging.Level; import java.util.logging.Logger; import org.apache.wicket.markup.html.MarkupUtil; import org.apache.wicket.markup.html.WebMarkupContainer; import org.apache.wicket.markup.html.WebPage; import org.apache.wicket.markup.html.basic.Label; import org.apache.wicket.markup.html.form.DropDownChoice; import org.apache.wicket.markup.html.form.Form; import org.apache.wicket.markup.html.form.FormComponentUpdatingBehavior; import org.apache.wicket.model.Model; import org.apache.wicket.model.PropertyModel; /** * * @author oyeso */ public class PrescientHome extends PrescientTemplateOriginalPage { private Model<ZipManagedBean> zipManager; private Form occForm; private WebMarkupContainer tagFrame; private Model<String> occupationListModel; private List <String> occupationList; private DropDownChoice<String> occupationChoices; public PrescientHome() { zipManager=Model.of(new ZipManagedBean()); occupationListModel= new Model<>(); occupationList=zipManager.getObject().getOccCode(); occupationChoices=new DropDownChoice<>("occupationModel",occupationListModel, occupationList ); //queue(occForm); occForm=new Form("occupationForm"){ @Override protected void onSubmit() { //Do the next thing } }; occForm.add(occupationChoices); add(occForm); } New Stack Trace below java.lang.IllegalStateException: This container is already dequeing: [Page class = org.possible.bug.PrescientHome, id = 0, render count = 0] at org.apache.wicket.MarkupContainer.dequeuePreamble(MarkupContainer.java:1918) at org.apache.wicket.MarkupContainer.dequeue(MarkupContainer.java:1856) at org.apache.wicket.MarkupContainer.dequeueChild(MarkupContainer.java:2018) at org.apache.wicket.MarkupContainer.dequeue(MarkupContainer.java:1983) at org.apache.wicket.MarkupContainer.dequeuePreamble(MarkupContainer.java:1931) at org.apache.wicket.MarkupContainer.dequeue(MarkupContainer.java:1856) at org.apache.wicket.MarkupContainer.onInitialize(MarkupContainer.java:1887) at org.apache.wicket.Page.onInitialize(Page.java:298) at org.apache.wicket.Component.fireInitialize(Component.java:873) at org.apache.wicket.MarkupContainer.internalInitialize(MarkupContainer.java:1038) at org.apache.wicket.Page.isPageStateless(Page.java:461) at org.apache.wicket.core.request.mapper.AbstractBookmarkableMapper.getPageInfo(AbstractBookmarkableMapper.java:473) at org.apache.wicket.core.request.mapper.AbstractBookmarkableMapper.mapHandler(AbstractBookmarkableMapper.java:420) at org.apache.wicket.core.request.mapper.MountedMapper.mapHandler(MountedMapper.java:155) at org.apache.wicket.request.mapper.CompoundRequestMapper.mapHandler(CompoundRequestMapper.java:210) at org.apache.wicket.request.cycle.RequestCycle.mapUrlFor(RequestCycle.java:451) at org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:233) at org.apache.wicket.core.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:202) at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:914) at org.apache.wicket.request.RequestHandlerExecutor.execute(RequestHandlerExecutor.java:65) at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:282) at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:253) at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:221) at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:275) at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:206) at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:299) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:251) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:209) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:755) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:575) at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:159) at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:371) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:238) at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:520) at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:217) at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:182) at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:156) at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:218) at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:95) at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:260) at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:177) at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:109) at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:88) at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:53) at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:524) at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:89) at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:94) at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:33) at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:114) at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:569) at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:549) at 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