If you have a small project you could host somewhere that might help, or
just zip up all the source. Clearly this can't happen (ignoring for the
moment that it is), but the framework obviously relies on this working
so I'd have to assume something funky is going on.
Dave
Andy Sykes wrote:
I dug around in the ServletConfig interceptor and modified my code to
mimic how it handles this situation - retrieve the Action as an Object
type, test for instanceof <Interface>, the cast to it. For some reason,
that still does not work.
As a test case, I'm mimicking the code exactly. My action extends
ActionSupport and implements SessionAware.
In the interceptor, I retrieve the action as an Object, test if it's an
instanceof SessionAware, then cast. Logging statements show that the
cast never happens. If I try to skip the test and cast directly, I get a
CCE. However, the ServletConfigInterceptor is able to do exactly the
same thing without getting a CCE.
Either there's some messed up going on in my dev environment, or I'm
being really dumb, or.. god knows. I've cleared out all the old
libraries and I'm just running with the bare essentials.
Test case:
public class ParseInterceptor extends AbstractInterceptor {
private static final Logger log =
Logger.getLogger(ParseInterceptor.class);
@Override
public String intercept(ActionInvocation invocation) throws Exception {
final Object action = invocation.getAction();
if (action instanceof SessionAware) {
log.error("Action is an instance of SessionAware.");
}
return invocation.invoke();
}
}
For reference, the relevant sections in the ServletConfigInterceptor:
public class ServletConfigInterceptor extends AbstractInterceptor
implements StrutsStatics {
public String intercept(ActionInvocation invocation) throws Exception {
final Object action = invocation.getAction();
final ActionContext context =
invocation.getInvocationContext();
...snip...
if (action instanceof SessionAware) {
((SessionAware)
action).setSession(context.getSession());
}
}
}
On 30 Jan 2009, at 12:22, Andy Sykes wrote:
No, I don't 'need' the cast to Action. However, if I cast what I get
back from ActionInvocation.getAction() straight to SessionAware or
similar, it still chucks a CCE.
I'm using Netbeans, and I'm pretty sure there's no crazy stuff going
on with the classloader - all my struts jars are in my context's lib
directory.
On 30 Jan 2009, at 11:57, Nils-Helge Garli Hegvik wrote:
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
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscr...@struts.apache.org
For additional commands, e-mail: user-h...@struts.apache.org
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscr...@struts.apache.org
For additional commands, e-mail: user-h...@struts.apache.org
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscr...@struts.apache.org
For additional commands, e-mail: user-h...@struts.apache.org
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscr...@struts.apache.org
For additional commands, e-mail: user-h...@struts.apache.org
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscr...@struts.apache.org
For additional commands, e-mail: user-h...@struts.apache.org
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscr...@struts.apache.org
For additional commands, e-mail: user-h...@struts.apache.org
