Thanks for your answer,
Maybe that interface is tapetry-4 only because I can't find it in my
Tapestry3.
Anyway, I've added this:
public void pageEndRender(PageEvent event) {
// do nothing
}
To fully implement that interface, and I still get the same error...
-----Mensaje original-----
De: Paul Cantrell [mailto:[EMAIL PROTECTED]
Enviado el: domingo, 21 de agosto de 2005 19:44
Para: Tapestry users
Asunto: Re: Problem with abstract class "Unable to instantiate..."
If you implement PageRenderListener, you also need a pageEndRender() method.
Trying implementing just PageBeginRenderListener.
Cheers,
Paul
On Aug 21, 2005, at 7:03 AM, Francisco A. Lozano wrote:
> Hello,
>
> I'm starting with tapestry 3. I have a page which I've marked as
> abstract, because I have a property inside it.
> I get this error when I try to access this page:
>
> org.apache.tapestry.ApplicationRuntimeException
> Unable to instantiate an instance of class
> com.fll.pruebastapestry.pages.ElementForm$Enhance_4.
>
> I've searched for such error in mailing list and I've found that it
> happens when tapestry thinks it hasn't to enhance a class... But mine
> has to be enhanced, as I have a property-specification marked as
> persistent...
>
> My .page is here:
>
> <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE page-specification
> PUBLIC
> "-//Apache Software Foundation//Tapestry Specification 3.0//EN"
> "http://jakarta.apache.org/tapestry/dtd/Tapestry_3_0.dtd";>
> <!-- generated by Spindle, http://spindle.sourceforge.net -->
>
> <page-specification class="com.fll.pruebastapestry.pages.ElementForm">
> <description>add a description</description>
> <property-specification name="element"
> type="com.fll.pruebastapestry.model.Element" persistent="yes"/>
> </page-specification>
>
> My .java is here:
>
> package com.fll.pruebastapestry.pages;
>
> import org.apache.tapestry.event.PageEvent;
> import org.apache.tapestry.event.PageRenderListener;
> import org.apache.tapestry.html.BasePage;
>
> import com.fll.pruebastapestry.model.Element;
> import com.fll.pruebastapestry.model.dao.ElementDAO;
>
> public abstract class ElementForm extends BasePage implements
> PageRenderListener{
>
> public abstract Element getElement();
> public abstract void setElement(Element element);
>
> public void initialize() {
> setElement(null);
> }
>
> public void loadData() {
>
> System.out.println("pageBeginRender called!!!!");
> if(this.getElement()==null) {
> System.out.println("pageBeginRender sets element!");
> this.setElement (
> ElementDAO.getInstance().get("EPAT01") );
> }
> }
>
> public void pageBeginRender(PageEvent event) {
> loadData();
> }
> }
>
>
>
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