If you use the below constrcutor, it should solve your problem.
DropDownChoice(java.lang.String id, IModel model, IModel choices,
IChoiceRenderer renderer)
2009/10/9 Altuğ B. Altıntaş <alt...@gmail.com>:
> Hi;
> I have a problem with DropDownChoice; The code block is here :
>
> List<Faaliyet>faaliyetListesi = // data comes
>
> final DropDownChoice<Faaliyet> faaliyetler =
> new DropDownChoice<Faaliyet>("Faaliyetler",
> new Model((Serializable) faaliyetListesi),
> faaliyetlerRenderer) {
>
> �...@override
> protected boolean wantOnSelectionChangedNotifications()
> {
> return true;
> }
>
> �...@override
> protected void onSelectionChanged(Faaliyet newSelection)
> {
> super.onSelectionChanged(newSelection);
> PageParameters params = new PageParameters();
> params.add("ay", finalAy + "");
> params.add("yil", finalYil + "");
> params.add("faaliyetId", newSelection.getId() + "");
> setResponsePage(ActionPage.class, params);
>
> }
> };
>
>
> add(faaliyetler);
>
>
>
> The error message is :
>
> wicketMessage: Method onSelectionChanged of interface
> org.apache.wicket.markup.html.form.IOnChangeListener targeted at
> component [MarkupContainer [Component id = Faaliyetler]] threw an
> exception
>
> Root cause:
>
> java.lang.IllegalStateException: Attempt to set model object on null
> model of component: Faaliyetler
> at org.apache.wicket.Component.setDefaultModelObject(Component.java:3038)
> at
> org.apache.wicket.markup.html.form.FormComponent.updateModel(FormComponent.java:1168)
> at
> org.apache.wicket.markup.html.form.DropDownChoice.onSelectionChanged(DropDownChoice.java:158)
> at java.lang.reflect.Method.invoke(Method.java:597)
> 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.j
>
> --
>
> Any suggestions ?
>
> Altuğ.
>
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