Hi
So after much debugging I found that:
1. Our class is available in the WebappClassLoader because
classLoader.loadClass(“com.algorithmics.opvantage.model.domain.Event”) returns
the class. The problem is that the bytecode enhancement for ongl uses javassist
to find the class and if the class is not already in the HiveMindClassPool
cache then an attempt to create a new javassist.CtClassType.CtClassType but
doesn’t use classLoader.loadClass but rather
classLoader.getResource(“com/algorithmics/opvantage/model/domain/Event.class”)
which of course doesn’t exist because these classes are compiled at app
startup. Is there some way to add our classes to the HiveMindClassPool at
startup? If we could do that then I think all would work as expected.
2. Also the error about not finding the
com.algorithmics.opvantage.model.domain.Event while being a problem doesn’t
actually stop the rendering the page because once the bytecode enhancement
fails it falls back to the old ongl way of resolving.
The problem being in ExpressionEvaluatorImpl line 141 the context that is
passed has no root set(it should be the page) so the dynamic
sharedPickerProperty in content.domain[sharedPickerProperty] fails with ognl
null source error. I guess that is a bug. Also if failsafe is allowed shouldn’t
the error level of bytecode enhancement be WARN and not ERROR(when using
content.domain.startDate the page renders but these exceptions are in the
logs!)?
Thanks in advance
Howard
On Tue, 12 May 2009 16:49:57 GMT, <hls...@gmail.com> wrote:
>
>It would be helpful to see the Domain class. Perhaps there's an
>overloaded method that's confusing the OGNL code. As you can see, it's
>trying to generate bytecode for your expression, but failing for some
>reason. Classloader issues can get very tricky inside this kind of
>code.
On Tue, May 12, 2009 at 8:12 AM, <howard.kel...@algorithmics.com> wrote:
>
> Hi
> Ognl in 4.1.6 is behaving rather strangely(I believe this must be a bug)!
> We're trying
>to upgrade from 4.0.2.
> Here's a simplified version of what's happening in an insert component.
> value="ognl:content.domain['startDate']"
>renders correctly however value="ognl:content.domain[sharedPickerProperty]"
>where sharedPickerProperty
>is a property of the page and has initial-value="literal:startDate" results in
> org.apache.tapestry.services.impl.HiveMindExpressionCompiler]
> context=/opvantage - Error
>generating OGNL getter for expression content.domain[sharedPickerProperty]
>with root $domainbase...@3c1[edit:Event]
>and body:
> { return
> ((com.algorithmics.opvantage.model.domain.Event)(($DomainBase_42)$2).getContent().getDomain()).getStartDate();}
> org.apache.hivemind.ApplicationRuntimeException: Unable to add method
> java.lang.Object
>get(ognl.OgnlContext, java.lang.Object) to class $ASTChain_121354aa5aa:
>[source error] no
>such class: com.algorithmics.opvantage.model.domain.Event
>
> Now obviously com.algorithmics.opvantage.model.domain.Event does exist
> because content.domain['startDate']
>works!
> How can we get around this because in a dynamic application like ours we
> don't have the
>luxury of doing content.domain.startDate/content.domain['startDate'] because
>we don't know
>what the property name is at .page creation.
> Any help would be greatly appreciated.
> Thanks in advance
> Howard
>
>
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--
Howard M. Lewis Ship
Creator of Apache Tapestry
Director of Open Source Technology at Formos
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