Re: Generics support problem

[Howard Lewis Ship <hl...@gmail.com>]

I'm starting to see the problem here, as part of TAPESTRY-2202.
There's the possibility of mismatch between the BeanEditor model and
the object being edited.  I think TAPESTRY-2202 will incidentally fix
it.

On Fri, Feb 29, 2008 at 12:58 PM, Davor Hrg <hr...@gmail.com> wrote:
> :(
>
>  just tried wth javassist 3.7ga ... still breaks
>  tried java 1.5 && 1.6 .. also breaks
>  ...
>  look like I'll have to investigate it much more
>
>
>  Davor Hrg
>
>
>
>  On 2/29/08, Davor Hrg <hr...@gmail.com> wrote:
>  > generics support just crashed wierdly,
>  >
>  > not to say it is tapestry error ... still can not pinpoint reasons,
>  > but found a cause...
>  >
>  >
>  > the code broke with proeprtyconduit exception
>  > ....Class java.lang.Object does not contain a property named ....
>  >
>  >
>  > so, the case that causes a problem follows:
>  >
>  > I have:
>  > list page
>  > edit page
>  > edit component for an entity (palced inside edit page of course :) )
>  >
>  > the editComponent extends a generic component that declares
>  >    public T getEntity()
>  >
>  > if I override it in edit component
>  >    public MyEnt getEntity()
>  >
>  > the property conduit breaks...
>  > but that is not all, it breaks if first page accessed if list page
>  >
>  > if I restart the app and use edit page as first acces, all works well,
>  >
>  > ... I debugged the wierdass thing for few hours and found that
>  > reflection code was broken and reporting wrong types ...
>  >
>  >
>  > without override
>  >    public MyEnt getEntity()
>  >
>  > method.getGenericReturnType() returns TypeVariable...which is ok
>  >
>  >
>  > with override, and with edit page as first
>  > method.getGenericReturnType() returns MyEnt.class as is expected for
>  > non generic methods (which this one realy is)
>  >
>  >
>  > but the problematic situation is the wierd one,
>  > with override, and with list page as first
>  > method.getGenericReturnType() returns Object.class which is very wrong...
>  >
>  > so if anyone is having issues with generic support, look for this
>  > problem in you code maybe...
>  >
>  > I'm willing to blame this on javassist, and hope it will work in a
>  > next version ..
>  >
>  >
>  > Davor Hrg
>  >
>
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-- 
Howard M. Lewis Ship

Creator Apache Tapestry and Apache HiveMind

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