What is U? In my understanding Check(box) operates on a Boolean value
so the classcast exception might be there (btw. I always use
CheckBox.. I never tried Check..).
**
Martin
2009/8/4 burnst...@burnstone.ch <burnst...@burnstone.ch>:
> Hi all
>
> I'm trying to use CheckGroup, but encounter some problems. First, my code:
>
> class NameValueListView<T extends ParameterValueProvider<?>> extends
> ListView<T> {
>
> <U> void displayItem(ListItem<T> listItem, ParameterValueProvider<U>
> parameter) {
> ...
> List<U> enumItems = new ArrayList<U>(parameter.getEnumCodes());
> addMultiSelectPanelListItem(listItem, enumItems, labelModel, new
> PropertyModel<Collection<U>>(parameter,
> "valueList"), parameter);
> }
>
> <U> void addMultiSelectPanelListItem(ListItem<T> listItem,
> List<U> enumItems, IModel<String> labelModel,
> IModel<Collection<U>> model,
> final ParameterValueProvider<U> parameter) {
>
> CheckGroup<U> comp = new CheckGroup<U>("value");
> comp.setType(parameter.getType());
> comp.setRequired(!parameter.isOptional());
> comp.setLabel(labelModel);
>
> ListView<U> enumListView = new ListView<U>("values", enumItems) {
> @Override
> protected void populateItem(ListItem<U> item) {
> item.add(new Check<U>("check", item.getModel()));
> item.add(new Label("value",
> item.getDefaultModelObjectAsString()));
> }
> };
> enumListView.setReuseItems(true);
> comp.add(enumListView);
>
> // Add panel
> MultiCheckBoxPanel<U> panelMCB = new
> MultiCheckBoxPanel<U>(COMPONENT_ID, comp);
> listItem.add(panelMCB);
> }
> }
>
> ParameterValueProvider has the mehtods {get,set}Value[List].
>
> The html looks like this:
> <html xmlns:wicket>
> <wicket:panel>
> <span wicket:id="value">
> <span wicket:id="values">
> <input type="checkbox" wicket:id="check" />
> <span wicket:id="value"></span>
> <br/>
> </span>
> </span>
> </wicket:panel>
> </html>
>
> So far, so good. Values are getting displayed and the correct check boxes
> are selected. However, when submitting the form, I get an exception:
>
> ---------------------------------------------------
> WicketMessage: Method onFormSubmitted of interface
> org.apache.wicket.markup.html.form.IFormSubmitListener targeted at component
> [MarkupContainer [Component id = cardDetailForm]] threw an exception
>
> Root cause:
>
> java.lang.ClassCastException: java.lang.String
> at
> org.apache.wicket.markup.html.form.CheckGroup.updateModel(CheckGroup.java:171)
> at
> org.apache.wicket.markup.html.form.Form$FormModelUpdateVisitor.component(Form.java:225)
> at
> org.apache.wicket.markup.html.form.FormComponent.visitComponentsPostOrderHelper(FormComponent.java:514)
> at
> org.apache.wicket.markup.html.form.FormComponent.visitComponentsPostOrderHelper(FormComponent.java:493)
> at
> org.apache.wicket.markup.html.form.FormComponent.visitComponentsPostOrderHelper(FormComponent.java:493)
> at
> org.apache.wicket.markup.html.form.FormComponent.visitComponentsPostOrderHelper(FormComponent.java:493)
> at
> org.apache.wicket.markup.html.form.FormComponent.visitComponentsPostOrderHelper(FormComponent.java:493)
> at
> org.apache.wicket.markup.html.form.FormComponent.visitComponentsPostOrder(FormComponent.java:465)
> at
> org.apache.wicket.markup.html.form.Form.internalUpdateFormComponentModels(Form.java:2051)
> at
> org.apache.wicket.markup.html.form.Form.updateFormComponentModels(Form.java:2019)
> at org.apache.wicket.markup.html.form.Form.process(Form.java:984)
> at org.apache.wicket.markup.html.form.Form.process(Form.java:911)
> at org.apache.wicket.markup.html.form.Form.onFormSubmitted(Form.java:876)
> at java.lang.reflect.Method.invoke(Unknown Source)
> at
> org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:182)
> at
> org.apache.wicket.request.target.component.listener.ListenerInterfaceRequestTarget.processEvents(ListenerInterfaceRequestTarget.java:73)
> at
> org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:92)
> at
> org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1241)
> at org.apache.wicket.RequestCycle.step(RequestCycle.java:1320)
> at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1419)
> at org.apache.wicket.RequestCycle.request(RequestCycle.java:545)
> at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:456)
> at
> org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:289)
> at
> org.mortbay.jetty.servlet.WebApplicationHandler$Chain.doFilter(WebApplicationHandler.java:334)
> at
> org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:286)
> at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:567)
> at org.mortbay.http.HttpContext.handle(HttpContext.java:1807)
> at
> org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:525)
> at org.mortbay.http.HttpContext.handle(HttpContext.java:1757)
> at org.mortbay.http.HttpServer.service(HttpServer.java:879)
> at org.mortbay.http.HttpConnection.service(HttpConnection.java:789)
> at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:960)
> at org.mortbay.http.HttpConnection.handle(HttpConnection.java:806)
> at org.mortbay.http.SocketListener.handleConnection(SocketListener.java:218)
> at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:331)
> at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:520)
>
> Complete stack:
>
> org.apache.wicket.WicketRuntimeException: Method onFormSubmitted of
> interface org.apache.wicket.markup.html.form.IFormSubmitListener targeted at
> component [MarkupContainer [Component id = cardDetailForm]] threw an
> exception
> at
> org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:193)
> at
> org.apache.wicket.request.target.component.listener.ListenerInterfaceRequestTarget.processEvents(ListenerInterfaceRequestTarget.java:73)
> at
> org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:92)
> at
> org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1241)
> at org.apache.wicket.RequestCycle.step(RequestCycle.java:1320)
> at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1419)
> at org.apache.wicket.RequestCycle.request(RequestCycle.java:545)
> at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:456)
>
> java.lang.reflect.InvocationTargetException
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
> at java.lang.reflect.Method.invoke(Unknown Source)
> at
> org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:182)
> at
> org.apache.wicket.request.target.component.listener.ListenerInterfaceRequestTarget.processEvents(ListenerInterfaceRequestTarget.java:73)
> at
> org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:92)
> at
> org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1241)
> at org.apache.wicket.RequestCycle.step(RequestCycle.java:1320)
> at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1419)
> at org.apache.wicket.RequestCycle.request(RequestCycle.java:545)
> at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:456)
> ---------------------------------------------------
>
> I then looked at the wicket-examples and saw that CheckGroup was initialized
> without a model. This won't work for me, but I tried it anyway. The only
> result is:
>
> ---------------------------------------------------
> "WicketMessage: CheckGroup [41:cardDetailForm:rows:11:panel:value] contains
> a null model object, must be an object of type java.util.Collection"
> ---------------------------------------------------
>
> I didn't see any other major differences between the example and my code
> (uh, okay, except some type parameters and stuff, but well...).
>
> So. Any ideas?
>
> -- chris
>
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