[rules-users] ClassCastException

[Shannon Lal]

Christoph,
I am not sure that this is a rules problem as it seems to be more of a Java
problem.  Do you Event types all inherit from a base class?  Could you not
just check to see on the base class is present?  Also, you might want to add
in SMALL example of what you are trying to do in pure Java code (outside of
Rules) as it might be easy to translate.

Shannon

On Thu, May 14, 2009 at 6:35 AM, Christoph Kramer <amrod at gmx.de> wrote:

> Hi all,
> i've some problems with a ClassCastException when using the
> "or"-conditional element.
> I have different Java-Beans which all have some string-values. Now I want
> to create one rule which is able to handle every type of my classes because
> it would be a lot of work to create one rule for every class.
> Depending on the type of beans in the working memory the programm is
> crashing with an ClassCastException.
>
> Here is a snippet of my drl-file with the "crashing-rule":
>
> rule "BizLocation"
>   when
>       $epc : EPC()
>       QuantityEventType(epcClass == $epc.value ,$bizLoc: bizLocation !=null
> ) or AggregationEventType(childEPCs.epc contains $epc, $bizLoc : bizLocation
> != null) or ObjectEventType(epcList.epc  contains $epc, $bizLoc :
> bizLocation != null)
>   then
>       System.out.println("BizLocation: " +$bizLoc.getId());
> end
>
>
> There are some EPC's in the working memory and some Events (which might be
> of type QuantityEventType, AggregationEventType or ObjectEventType). When
> there are only ObjectEventType in the working memory, everything works fine,
> but wenn there is an QuantityEventType this rule crashes with
> "org.fosstrak.epcis.model.QuantityEventType cannot be cast to
> org.fosstrak.epcis.model.ObjectEventType".
> I've lot of other, similar rules some of them crashing, others don't.
>
>
> Can anyone give me a hint where is the error?
>
> Thanks,
> Christoph
>
> PS: Sorry for the bad english :(
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