Jeromy Evans - Blue Sky Minds wrote:
>
> Jeromy Evans wrote:
>> mraible wrote:
>>
>>>
>>> I tried FreeMarker this morning and discovered that the problem
>>> exists there
>>> too. Grrr. I've experienced Struts 2 being eliminated as a web framework
>>> candidate on a couple projects because of this. Kindof annoying.
>>>
>>
>> So what do you really want? My guess here is that you invoked a
>> struts tag and the tag swallowed the error and provided a default to
>> the freemarker template.
>>
>>
>
> On further thought I think this comes down to an interesting issue with
> coupling between the view and the model.
> In struts2 the model is a ValueStack that consists of both a stack and
> map (context). OGNL is used to address properties or methods in that
> model and it's a trivial for OGNL to log when it fails to match a
> property or method.
>
> In the view, Struts2 provides tags for jsp, ftl or velocity that
> evaluate OGNL expressions to access the model. More often that not the
> tags fail silently if the expression was invalid or failed to evaluate
> anything. Herein lies the problem.
>
> If I were using FTL directly to access the value stack, as a developer I
> could decide how to handle missing properties, blank properties or
> default values with FTL's excellent error handling. However, when I use
> FTL to invoke a Struts2 tag I lose that benefit as the tag
> implementations *transfer* properties into the FTL context. I think its
> a flaw that Struts2 tags evaluate OGNL expressions themselves prior to
> rendering the template..
>
> A tag overhaul is well overdue (but major effort). I've expressed other
> concerns about the Struts2 tags (XWork Component and UIBean) on several
> occasions already.
>
I realize it might be a major effort, but this seems to be a pretty big deal
to me. Not for users that've already chosen Struts 2 as a web framework, but
for folks evaluating Java Web Frameworks. The fact that Struts 2 is the
*only* one that doesn't blow up on invalid properties makes it look pretty
bad for evaluations. It's kindof like the old blank page you'd sometimes get
with Tiles - you really have no idea what you did wrong and it can take
quite some time to track it down if you don't know what's causing it.
Matt
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