Thanks Thiago, I wasn't fully aware of the 'controlled package' concept,
however it does make sense.
I tried casting to 'ClientBodyElement' and while the cast works, I found
the zone update does not succeed since at that point the object has not
been assigned a clientId. I find this strange since I've just used the
clientId to lookup the component.
So (at least part of) the workaround is still required. I can get rid of
the reflection portion however, which was my main problem.
// Ideal solution: this doesn't work since the component (zone)
hasn't yet been assigned a clientId
ClientBodyElement zone = (ClientBodyElement)
getEmbeddedComponent(container, zoneId);
ajaxResponseRenderer.addRender(zone);
// the following is a workaround
ClientBodyElement zone = (ClientBodyElement)
getEmbeddedComponent(container, zoneId);
ajaxResponseRenderer.addRender(zoneId, zone.getBody());
On 28/02/2012 9:50 PM, Thiago H. de Paula Figueiredo wrote:
On Tue, 28 Feb 2012 06:40:41 -0300, Paul Stanton <p...@mapshed.com.au>
wrote:
Hi Tapestry committers/experts (in particular)
Hi!
Please take note of the method "idealImplementation". This is how I
expected to be able to implement the functionality, however a
ClassCastException is thrown casting the Component to a Zone. The
object being cast is definitely a zone but it turns out that there is
a classloader conflict in that the Zone of the returned object seems
to come from the Plastic classloader, while the type I'm trying to
cast it to comes from the standard classloader.
This explanation seems correct.
The only way I have found to workaround this situation is to avoid
the cast altogether, which involves using reflection.
Don't cast to classes in controlled packages unless you are in a
controlled package. Deep in Tapestry, everything that can be rendered
is a RenderCommand and all components are Component instances.
RenderCommand and Component are interfaces which aren't in controlled
packages, so it's safe to cast to them everywhere.
For your specific scenario, AjaxResponseRenderer has an
addRender(String clientId, Object renderer). Notice the renderer
parameter can be anything which is a Block, Component or can be
coerced to a RenderCommand. It also has an addRender(ClientBodyElement
zone). Notice Zone implements ClientBodyElement, so your
idealImplementation() method should work if you change your casts from
Zone to ClientBodyElement.
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