THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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Replace it with standard Java 8 java.util.function.Supplier<T> which is virtually identical.
Deprecate org.apache.wicket.util.IContextProvider
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Replace IContextProvider<T, C> with standard Java 8 java.util.function.Function<C, T> which is virtually identical.
As a consequence IPageManagerProvider, IPageRendererProvider and IRequestCycleProvider now override #apply() method instead of #get().
Deprecate org.apache.wicket.protocol.http.documentvalidation.HtmlDocumentValidator
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Tests based on HtmlDocumentValidator are very fragile. They start to fail as soon as there is a single character change somewhere in the page markup.
We believe that there are very few users of this API. It is recommended to use TagTester and WicketTestCase#executeTest() instead.
IGenericComponent's setter methods now return the current instance for method chaining
All specialization classes return their type.
AjaxButton, AjaxLink and AjaxFallbackButton event callback methods no longer get form as second argument (WICKET-6184)
For consistency with other components and the new lambda support, the submitted form is no longer passed as argument to callback methods (e.g. #onSubmit(), #onClick()) of AjaxButton, AjaxLink and AjaxFallbackButton. You can call #getForm() instead.
AjaxFallback** components now use java.util.Optional
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All AjaxFallback** components and the containers which use internally AjaxFallback** components, like AjaxTabbedPanel, RatingPanel and TableTree, have been reworked to pass Optional<AjaxRequestTarget> instead of just AjaxRequestTarget to their onXyz() callback methods. This way the application developer should not forget to check that the AjaxRequestTarget is not null.
AbstractChoice#getChoices() is 'final' now
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AbstractChoice#getChoices() has been made final. If the application needs to provide different choices for each render then it should override AbstractChoice#getChoicesModel() instead. The application code would be almost the same as before, it will just need to wrap the final List result in an IModel, most probably ListModel.
ListenerInterfaceRequestHandler simplification
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RequestListenerInterface was removed: IResourceListener, IBehaviorListener, IOnChangeListener, ILinkListener are replaced by the generic method IRequestListener#onRequest().
A Component or Behavior can now implement IRequestListener once only, thus removing the need to include an identifier (e.g. "ILinkListener") in the URL.
Behavior changes
FormComponentPanel delegates the call to #clearInput to its FormComponent children
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FormComponent#clearInput() has been made non-final, so that now containers like FormComponentPanel could override this method and call #clearInput() on its children of type FormComponent.
Use DynamicJQueryResourceReference by default
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By using org.apache.wicket.resource.DynamicJQueryResourceReference Wicket will contribute jQuery ver. 2.x for modern browsers and ver. 1.x when the request is done by Internet Explorer older than ver. 9.
Removals
Drop Jetty 7.x and 9.0.x modules for Wicket Native WebSocket
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