In 5.4, you can contribute to the default error page and map exception
types to specific error pages (
http://tapestry.apache.org/5.4/apidocs/org/apache/tapestry5/internal/services/DefaultRequestExceptionHandler.html
- that reminds me, I should add information about that to the user guide
as
well).
So ... I tried and failed ... surprise surprise - it's 2:30am :)
If a simple example to start off with helps, this is what I have so far.
I have a Slider component from earlier in the thread. It fetches slider
data from persistence via EJB/JPA in a tapestry IoC service via
setupRender()
The Slider component template - it has 4 slides, hardcoded so it needs 4
slides! Obviously needs more dev to make it more configurable (i.e. 2
slides or 5 slides)
<t:container xmlns:t="http://tapestry.apache.org/schema/tapestry_5_3.xsd";>
<!-- Slider starts -->
<div class="parallax-slider">
<!-- Slider (Parallax Slider) -->
<div id="da-slider" class="da-slider">
<!-- Each slide should be enclosed inside
"da-slide" class -->
<div class="da-slide">
<div class="slide-details">
<!-- Heading -->
<h2><span>${slider.heading1}</span></h2>
<!-- Para -->
<p>${slider.blurb1}</p>
<!-- Read more link -->
<a href="${slider.href1}"
class="da-link">${slider.text1}</a>
<!-- Image -->
<div class="da-img"><img
src="${context:img/parallax/1.png}" alt="image01" /></div>
</div>
</div>
<div class="da-slide">
<h2><span>${slider.heading2}</span></h2>
<p>${slider.blurb2}</p>
<a href="${slider.href2}"
class="da-link">${slider.text2}</a>
<div class="da-img"><img
src="${context:img/parallax/2.png}" alt="image01" /></div>
</div>
<div class="da-slide">
<h2><span>${slider.heading3}</span></h2>
<p>${slider.blurb3}</p>
<a href="${slider.href3}"
class="da-link">${slider.text3}</a>
<div class="da-img"><img
src="${context:img/parallax/3.png}" alt="image01" /></div>
</div>
<div class="da-slide">
<h2><span>${slider.heading4}</span></h2>
<p>${slider.blurb4}</p>
<a href="${slider.href4}"
class="da-link">${slider.text4}</a>
<div class="da-img"><img
src="${context:img/parallax/4.png}" alt="image01" /></div>
</div>
<nav class="da-arrows">
<span class="da-arrows-prev"></span>
<span class="da-arrows-next"></span>
</nav>
</div>
</div>
<!-- Slider ends -->
</t:container>
When the component Slider fetches the stored data and it doesn't exist, an
EJBException/NoResultException is caught in the SliderFetchDataService and
rethrown as a SliderException.
public class SliderException extends RuntimeException {
public SliderException(Throwable throwable) {
super(throwable);
}
public SliderException(String message, Throwable throwable) {
super(message, throwable);
}
}
The custom/contributed exception handling page is called DefaultNeeded and
reading the docs I'm expecting DefaultNeeded/Slider to be redirected to
but don't expect anything for the moment because it's bare (no context is
handled)
Here is DefaultNeeded java/tml
public class DefaultNeeded {
//no activation context yet, just display a page
}
<html t:type="Bare" title="Create SliderSection" t:sidebarTitle="Current
Time"
xmlns:t="http://tapestry.apache.org/schema/tapestry_5_3.xsd";
xmlns:p="tapestry:parameter">
<h1>Create SliderSection</h1>
<div class="SliderSection">
<!-- Note this is commented out
<t:beaneditform object="newSliderSection" exclude="id" />
-->
</div>
</html>
And I've contributed all this in AppModule
public void
contributeDefaultRequestExceptionHandler(MappedConfiguration<Class, Class>
configuration) {
configuration.add(SliderException.class, DefaultNeeded.class);
}
with a few attempts guessing the method name
contributeRequestExceptionHandler, contributeExceptionHandler but each
time a similar error in the logs:
Caused by: java.lang.IllegalArgumentException: Contribution
org.opencsta.website.metwide.web.services.AppModule.contributeDefaultRequestExceptionHandler(MappedConfiguration)
(at AppModule.java:133) is for service 'DefaultRequestExceptionHandler',
which does not exist.
So I guess I just have the wrong contributeMethodName/ArgumentList
happening - looks like several arguments missing
Looking at
http://tapestry.apache.org/5.4/apidocs/org/apache/tapestry5/internal/services/DefaultRequestExceptionHandler.html
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