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https://issues.apache.org/jira/browse/TAP5-1548?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Zeigler updated TAP5-1548:
---------------------------------
Attachment: generics.bug1demo.tgz
Simple project that illustrates the bug. I originally thought this was related
to generics support, hence the "generics" naming throughout. But I found
generics were not necessary to reproduce the problem.
> Property expressions fails when using a supertype that implements an
> interface with a matching method
> -----------------------------------------------------------------------------------------------------
>
> Key: TAP5-1548
> URL: https://issues.apache.org/jira/browse/TAP5-1548
> Project: Tapestry 5
> Issue Type: Bug
> Components: tapestry-core
> Affects Versions: 5.2.5
> Reporter: Robert Zeigler
> Attachments: generics.bug1demo.tgz
>
>
> Given:
> public interface Baz {
> String getBar();
> }
> public class AbstractFoo implements Baz {
> private String bar;
> public String getBar() { return bar; }
> public void setBar(String bar) { this.bar =bar; }
> }
> public class Foo extends AbstractFoo {}
> public class AComponent {
> @Parameter
> @Property
> private AbstractFoo foo;
> }
> .tml:
> <t:form><t:textfield value="foo.bar"/></t:form>
> The update of the textfield will fail with "Failure writing parameter 'value'
> of component Index:layout.acomponent.textfield: Expression 'foo.bar' for
> class org.apache.tapestry5.generics1.components.AComponent is read-only".
> Note that if you:
> a) Specify Foo directly, it works
> b) Remove the "getFoo" from interface "Baz", it works
> c) add "setFoo" to the interface "Baz", it works.
> I would expect Tapestry to find the property from the base class first. In
> fact, it used to, in T5.1.0.4 at least, because I found this issue upgrading
> a project from 5.1.0.4 to 5.2.5 and a component that used to work broke. In
> that case, the component was using generic types (public class AComponent<T
> extends AbstractFoo>), but the problem shows up with or without the generics.
>
> I can accept that if I specify the type of the property as "Baz", I will get
> the above exception even if I pass in a "Foo" or "AbstractFoo". But using
> the (read-only) property from the Baz interface when I explicitly declare the
> property type to be AbstractFoo is unacceptable and a regression from
> previous behavior.
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