I created a one page app trying to isolate this problem. Here are the stack traces from new Exception().printStackTrace(). This is one Ajax request from a AjaxFormSubmitBehavior("onkeypress"). The code for the class Load is at the bottom.
java.lang.Exception at load.Load$LoadForm$1.isVisible(Load.java:46) at org.apache.wicket.Component.internalBeforeRender(Component.java:990) at org.apache.wicket.Component.beforeRender(Component.java:1027) at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.jav a:1513) at org.apache.wicket.Component.onBeforeRender(Component.java:3657) at org.apache.wicket.Component.internalBeforeRender(Component.java:995) at org.apache.wicket.Component.beforeRender(Component.java:1027) at org.apache.wicket.Component.prepareForRender(Component.java:2139) at org.apache.wicket.ajax.AjaxRequestTarget.respondComponent(AjaxRequestTarget. java:698) at org.apache.wicket.ajax.AjaxRequestTarget.respondComponents(AjaxRequestTarget .java:605) at org.apache.wicket.ajax.AjaxRequestTarget.respond(AjaxRequestTarget.java:520) at org.apache.wicket.request.AbstractRequestCycleProcessor.respond(AbstractRequ estCycleProcessor.java:103) at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:117 2) at org.apache.wicket.RequestCycle.step(RequestCycle.java:1241) at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1316) at org.apache.wicket.RequestCycle.request(RequestCycle.java:493) at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:354) at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:194) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:186) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:157) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja va:214) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja va:178) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126 ) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105 ) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java :107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:825) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConne ction(Http11Protocol.java:731) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.jav a:524) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWo rkerThread.java:80) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav a:684) at java.lang.Thread.run(Thread.java:595) ##### load() was first called here java.lang.Exception at load.Load$LoadForm$1.isVisible(Load.java:46) at org.apache.wicket.ajax.AjaxRequestTarget$3.component(AjaxRequestTarget.java: 937) at org.apache.wicket.MarkupContainer.visitChildren(MarkupContainer.java:821) at org.apache.wicket.MarkupContainer.visitChildren(MarkupContainer.java:861) at org.apache.wicket.ajax.AjaxRequestTarget.respondHeaderContribution(AjaxReque stTarget.java:933) at org.apache.wicket.ajax.AjaxRequestTarget.respondComponent(AjaxRequestTarget. java:701) at org.apache.wicket.ajax.AjaxRequestTarget.respondComponents(AjaxRequestTarget .java:605) at org.apache.wicket.ajax.AjaxRequestTarget.respond(AjaxRequestTarget.java:520) at org.apache.wicket.request.AbstractRequestCycleProcessor.respond(AbstractRequ estCycleProcessor.java:103) at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:117 2) at org.apache.wicket.RequestCycle.step(RequestCycle.java:1241) at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1316) at org.apache.wicket.RequestCycle.request(RequestCycle.java:493) at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:354) at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:194) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:186) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:157) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja va:214) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja va:178) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126 ) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105 ) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java :107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:825) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConne ction(Http11Protocol.java:731) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.jav a:524) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWo rkerThread.java:80) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav a:684) at java.lang.Thread.run(Thread.java:595) java.lang.Exception at load.Load$LoadForm$1.isVisible(Load.java:46) at org.apache.wicket.Component.renderHead(Component.java:2528) at org.apache.wicket.ajax.AjaxRequestTarget$3.component(AjaxRequestTarget.java: 939) at org.apache.wicket.MarkupContainer.visitChildren(MarkupContainer.java:821) at org.apache.wicket.MarkupContainer.visitChildren(MarkupContainer.java:861) at org.apache.wicket.ajax.AjaxRequestTarget.respondHeaderContribution(AjaxReque stTarget.java:933) at org.apache.wicket.ajax.AjaxRequestTarget.respondComponent(AjaxRequestTarget. java:701) at org.apache.wicket.ajax.AjaxRequestTarget.respondComponents(AjaxRequestTarget .java:605) at org.apache.wicket.ajax.AjaxRequestTarget.respond(AjaxRequestTarget.java:520) at org.apache.wicket.request.AbstractRequestCycleProcessor.respond(AbstractRequ estCycleProcessor.java:103) at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:117 2) at org.apache.wicket.RequestCycle.step(RequestCycle.java:1241) at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1316) at org.apache.wicket.RequestCycle.request(RequestCycle.java:493) at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:354) at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:194) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:186) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:157) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja va:214) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja va:178) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126 ) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105 ) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java :107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:825) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConne ction(Http11Protocol.java:731) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.jav a:524) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWo rkerThread.java:80) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav a:684) at java.lang.Thread.run(Thread.java:595) java.lang.Exception at load.Load$LoadForm$1.isVisible(Load.java:46) at org.apache.wicket.Component.render(Component.java:2277) at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1240) at org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.jav a:1407) at org.apache.wicket.MarkupContainer.onComponentTagBody(MarkupContainer.java:13 44) at org.apache.wicket.markup.html.form.Form.onComponentTagBody(Form.java:1648) at org.apache.wicket.Component.renderComponent(Component.java:2459) at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1354) at org.apache.wicket.markup.html.form.Form.onRender(Form.java:1687) at org.apache.wicket.Component.render(Component.java:2296) at org.apache.wicket.Component.renderComponent(Component.java:2399) at org.apache.wicket.ajax.AjaxRequestTarget.respondComponent(AjaxRequestTarget. java:703) at org.apache.wicket.ajax.AjaxRequestTarget.respondComponents(AjaxRequestTarget .java:605) at org.apache.wicket.ajax.AjaxRequestTarget.respond(AjaxRequestTarget.java:520) at org.apache.wicket.request.AbstractRequestCycleProcessor.respond(AbstractRequ estCycleProcessor.java:103) at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:117 2) at org.apache.wicket.RequestCycle.step(RequestCycle.java:1241) at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1316) at org.apache.wicket.RequestCycle.request(RequestCycle.java:493) at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:354) at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:194) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:186) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:157) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja va:214) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja va:178) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126 ) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105 ) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java :107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:825) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConne ction(Http11Protocol.java:731) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.jav a:524) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWo rkerThread.java:80) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav a:684) at java.lang.Thread.run(Thread.java:595) java.lang.Exception at load.Load$LoadForm$1.isVisible(Load.java:46) at org.apache.wicket.Component.toString(Component.java:3048) at org.apache.wicket.Component.toString(Component.java:3027) at java.lang.String.valueOf(String.java:2577) at java.lang.StringBuffer.append(StringBuffer.java:220) at org.apache.wicket.Component.render(Component.java:2284) at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1240) at org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.jav a:1407) at org.apache.wicket.MarkupContainer.onComponentTagBody(MarkupContainer.java:13 44) at org.apache.wicket.markup.html.form.Form.onComponentTagBody(Form.java:1648) at org.apache.wicket.Component.renderComponent(Component.java:2459) at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1354) at org.apache.wicket.markup.html.form.Form.onRender(Form.java:1687) at org.apache.wicket.Component.render(Component.java:2296) at org.apache.wicket.Component.renderComponent(Component.java:2399) at org.apache.wicket.ajax.AjaxRequestTarget.respondComponent(AjaxRequestTarget. java:703) at org.apache.wicket.ajax.AjaxRequestTarget.respondComponents(AjaxRequestTarget .java:605) at org.apache.wicket.ajax.AjaxRequestTarget.respond(AjaxRequestTarget.java:520) at org.apache.wicket.request.AbstractRequestCycleProcessor.respond(AbstractRequ estCycleProcessor.java:103) at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:117 2) at org.apache.wicket.RequestCycle.step(RequestCycle.java:1241) at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1316) at org.apache.wicket.RequestCycle.request(RequestCycle.java:493) at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:354) at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:194) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:186) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:157) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja va:214) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja va:178) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126 ) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105 ) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java :107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:825) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConne ction(Http11Protocol.java:731) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.jav a:524) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWo rkerThread.java:80) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav a:684) at java.lang.Thread.run(Thread.java:595) java.lang.Exception at load.Load$LoadForm$1.isVisible(Load.java:46) at org.apache.wicket.Component.toString(Component.java:3048) at org.apache.wicket.Component.toString(Component.java:3027) at java.lang.String.valueOf(String.java:2577) at java.lang.StringBuffer.append(StringBuffer.java:220) at org.apache.wicket.Page.componentRendered(Page.java:387) at org.apache.wicket.Component.rendered(Component.java:2512) at org.apache.wicket.Component.render(Component.java:2302) at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1240) at org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.jav a:1407) at org.apache.wicket.MarkupContainer.onComponentTagBody(MarkupContainer.java:13 44) at org.apache.wicket.markup.html.form.Form.onComponentTagBody(Form.java:1648) at org.apache.wicket.Component.renderComponent(Component.java:2459) at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1354) at org.apache.wicket.markup.html.form.Form.onRender(Form.java:1687) at org.apache.wicket.Component.render(Component.java:2296) at org.apache.wicket.Component.renderComponent(Component.java:2399) at org.apache.wicket.ajax.AjaxRequestTarget.respondComponent(AjaxRequestTarget. java:703) at org.apache.wicket.ajax.AjaxRequestTarget.respondComponents(AjaxRequestTarget .java:605) at org.apache.wicket.ajax.AjaxRequestTarget.respond(AjaxRequestTarget.java:520) at org.apache.wicket.request.AbstractRequestCycleProcessor.respond(AbstractRequ estCycleProcessor.java:103) at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:117 2) at org.apache.wicket.RequestCycle.step(RequestCycle.java:1241) at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1316) at org.apache.wicket.RequestCycle.request(RequestCycle.java:493) at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:354) at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:194) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:186) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:157) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja va:214) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja va:178) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126 ) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105 ) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java :107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:825) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConne ction(Http11Protocol.java:731) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.jav a:524) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWo rkerThread.java:80) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav a:684) at java.lang.Thread.run(Thread.java:595) java.lang.Exception at load.Load$LoadForm$1.isVisible(Load.java:46) at org.apache.wicket.Component.toString(Component.java:3048) at org.apache.wicket.Component.toString(Component.java:3027) at java.lang.String.valueOf(String.java:2577) at java.lang.StringBuffer.append(StringBuffer.java:220) at org.apache.wicket.Component.render(Component.java:2334) at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1240) at org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.jav a:1407) at org.apache.wicket.MarkupContainer.onComponentTagBody(MarkupContainer.java:13 44) at org.apache.wicket.markup.html.form.Form.onComponentTagBody(Form.java:1648) at org.apache.wicket.Component.renderComponent(Component.java:2459) at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1354) at org.apache.wicket.markup.html.form.Form.onRender(Form.java:1687) at org.apache.wicket.Component.render(Component.java:2296) at org.apache.wicket.Component.renderComponent(Component.java:2399) at org.apache.wicket.ajax.AjaxRequestTarget.respondComponent(AjaxRequestTarget. java:703) at org.apache.wicket.ajax.AjaxRequestTarget.respondComponents(AjaxRequestTarget .java:605) at org.apache.wicket.ajax.AjaxRequestTarget.respond(AjaxRequestTarget.java:520) at org.apache.wicket.request.AbstractRequestCycleProcessor.respond(AbstractRequ estCycleProcessor.java:103) at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:117 2) at org.apache.wicket.RequestCycle.step(RequestCycle.java:1241) at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1316) at org.apache.wicket.RequestCycle.request(RequestCycle.java:493) at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:354) at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:194) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:186) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:157) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja va:214) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja va:178) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126 ) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105 ) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java :107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:825) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConne ction(Http11Protocol.java:731) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.jav a:524) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWo rkerThread.java:80) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav a:684) at java.lang.Thread.run(Thread.java:595) java.lang.Exception at load.Load$LoadForm$1.isVisible(Load.java:46) at org.apache.wicket.Component.renderHead(Component.java:2528) at org.apache.wicket.markup.html.WebPage$1.component(WebPage.java:432) at org.apache.wicket.MarkupContainer.visitChildren(MarkupContainer.java:821) at org.apache.wicket.MarkupContainer.visitChildren(MarkupContainer.java:836) at org.apache.wicket.MarkupContainer.visitChildren(MarkupContainer.java:861) at org.apache.wicket.markup.html.WebPage.onDetach(WebPage.java:425) at org.apache.wicket.Component.detach(Component.java:1075) at org.apache.wicket.ajax.AjaxRequestTarget.detach(AjaxRequestTarget.java:437) at org.apache.wicket.RequestCycle.detach(RequestCycle.java:1046) at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1334) at org.apache.wicket.RequestCycle.request(RequestCycle.java:493) at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:354) at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:194) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Application FilterChain.java:186) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterCh ain.java:157) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.ja va:214) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.ja va:178) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126 ) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105 ) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java :107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:825) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConne ction(Http11Protocol.java:731) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.jav a:524) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWo rkerThread.java:80) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav a:684) at java.lang.Thread.run(Thread.java:595) ##### load() was called the second time here public class Load extends WebPage { public Load() { super(); IModel receiveModel = new LoadableDetachableModel() { private int load = 1; protected Object load() { load++; System.out.println("##### load() called=" + load); return new Dummy(); } }; add(new LoadForm("loadForm", new CompoundPropertyModel(receiveModel))); } public final class LoadForm extends Form { public LoadForm(final String id, final IModel model) { super(id, model); setOutputMarkupId(true); Label firstName = new Label("firstName") { @Override public boolean isVisible() { new Exception().printStackTrace(); return !super.getModelObjectAsString().equals(""); } }; firstName.setOutputMarkupId(true); firstName.setOutputMarkupPlaceholderTag(true); add(firstName); Label lastName = new Label("lastName"); lastName.setOutputMarkupId(true); add(lastName); TextField testTextField = new TextField("textTest", new Model()); testTextField.setOutputMarkupId(true); testTextField.add(new AjaxFormSubmitBehavior("onkeypress") { protected void onSubmit(AjaxRequestTarget target) { target.addComponent(LoadForm.this); } protected void onError(AjaxRequestTarget target) { } protected IAjaxCallDecorator getAjaxCallDecorator() { return new AjaxCallDecorator() { public CharSequence decorateScript(CharSequence script) { return "if(window.event.keyCode == 13){" + script + "};return false;"; } }; } }); add(testTextField); } } public final class Dummy { private String firstName = "First Name"; private String lastName = "Last Name"; public String getFirstName() { return firstName; } public void setFirstName(String firstName) { this.firstName = firstName; } public String getLastName() { return lastName; } public void setLastName(String lastName) { this.lastName = lastName; } } } > -----Original Message----- > From: Igor Vaynberg [mailto:[EMAIL PROTECTED] > Sent: Monday, April 21, 2008 8:09 PM > To: users@wicket.apache.org > Subject: Re: isVisible() with surrounding Markup and > LoadableDetachableModel > > > are you sure it is the same request and there is no redirect in > between? do new Exception().printStackTrace() inside your isvisible to > see where it is being called from > > -igor > > > On Mon, Apr 21, 2008 at 7:15 PM, Warren > <[EMAIL PROTECTED]> wrote: > > I did this in isVisible() and load was called twice. > > > > public boolean isVisible() > > { > > return !super.getModelObjectAsString().equals(""); > > > > > > } > > > > > -----Original Message----- > > > From: Igor Vaynberg [mailto:[EMAIL PROTECTED] > > > Sent: Monday, April 21, 2008 7:08 PM > > > To: users@wicket.apache.org > > > Subject: Re: isVisible() with surrounding Markup and > > > LoadableDetachableModel > > > > > > > > > loadable detachable model caches the value for the request, so even > > > though getobject() is called multiple times, load() is only called > > > once. > > > > > > -igor > > > > > > > > > On Mon, Apr 21, 2008 at 6:59 PM, Warren > > > <[EMAIL PROTECTED]> wrote: > > > > I have a form that has a lot of labels with surrounding markup > > > that needs to > > > > be visible based on whether their is a value or empty string. > > > The form uses > > > > a CompoundPropertyModel based on a LoadableDetachableModel. > > > How do I check > > > > the model value of a Label in isVisible() without having load() of > > > > LoadableDetachableModel being called twice. > > > > > > > > > > > > <wicket:enclosure child="lineItem.item.department.departmentName"> > > > > <br>Dept: <span > > > > > wicket:id="lineItem.item.department.departmentName">Supplements</span> > > > > </wicket:enclosure> > > > > > > > > > > > > Label departmentName = new > > > Label("lineItem.item.department.departmentName") > > > > { > > > > public boolean isVisible() > > > > { > > > > // How do I check value without load() being > > > called again > > > > } > > > > }; > > > > > > > > > > > > Thanks, > > > > > > > > Warren Bell > > > > > > > > > > > > > --------------------------------------------------------------------- > > > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > > > > > > > > > > --------------------------------------------------------------------- > > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional 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