Do you really need the first cast to Action? Anyway, could it be that
you're having conflicting struts and/or application jars several
places in your classloader hierarchy? That could explain certain
"should never happen" incidents...
Nils-H
On Fri, Jan 30, 2009 at 12:39 PM, Andy Sykes <a.sy...@ucl.ac.uk> wrote:
> Hi Wes,
>
> No, I'm not using Spring at all.
>
> The Action never passes the test of being an instanceof Parseable. If I make
> the action only implement SessionAware, and test if my action is an
> instanceof SessionAware, the test is never passed!
>
> Colour me confused!
>
> Andy.
>
>
> On 30 Jan 2009, at 00:55, Wes Wannemacher wrote:
>
>> On Thursday 29 January 2009 19:49:39 Andy Sykes wrote:
>>>
>>> Hi all,
>>>
>>> I've written an interceptor with a PreResultListener that gets the
>>> action with ActionInvocation.getAction(), then casts it to an
>>> interface ("Parseable", in this case). This lets me call a particular
>>> method on the action just prior to the result being rendered.
>>>
>>> The action implements Parseable and SessionAware.
>>>
>>> When I do the cast, I get an ClassCastException for
>>> com.opensymphony.xwork2.ActionSupport. If I take it down to one
>>> interface (SessionAware) and cast the action to it, I still get a CCE.
>>> What's weirder is I'm pretty sure this code worked on Struts 2.0.11.
>>>
>>> Here's a suitably simplified version of what I'm attempting to do:
>>>
>>> public String intercept(ActionInvocation invocation) throws Exception {
>>> invocation.addPreResultListener(new PreResultListener() {
>>> public void beforeResult(ActionInvocation invocation,
>>> String resultCode) {
>>> Action action = (Action)invocation.getAction();
>>> if (action instanceof Parseable) {
>>> ((Parseable)action).parse();
>>> }
>>> }
>>> });
>>>
>>> Any ideas what the hell is going on here?
>>>
>>>
>>
>> Is it possible that you are using Spring to instantiate your actions via
>> the
>> Spring plugin? It would seem that if the action passes the test, then the
>> cast
>> is legal. I ask about Spring in case the action is a proxied bean... It
>> comes
>> up from time to time that Spring created beans don't always seem to
>> inherit
>> every method that you would think... If Spring is in the mix, try having
>> Spring use CGLIB... I've had some luck that way, vs. dynamic JDK proxies.
>>
>> -Wes
>>
>> --
>>
>> Wes Wannemacher
>> Author - Struts 2 In Practice
>> Includes coverage of Struts 2.1, Spring, JPA, JQuery, Sitemesh and more
>> http://www.manning.com/wannemacher
>>
>>
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