[rules-users] Problems with custom functions and types in one drl file

[Edson Tirelli]

   This is a bug that was fixed a few weeks ago. If you can use trunk, you
will not have this problem.

   []s
   Edson

2009/5/5 Rainer Schulz <Rainer.Schulz at trivadis.com>

>  Hi,
>
> i have some problems with custom functions and types.
>
> I m using Drools 5.0 and Eclipse 3.4.2 (have to use these eclipse version,
> so my decision was to use the drools beta).
>
> I declared a type in my rule file like :
>
> *******declare* VarHolder
>
>     var1 : String
>
>     var2 : Long
>
>     var3 : String
>
> *******end*
>
> also i specified a custom function in the same file, which i have to use
> in my rules (it’s a example function) :
>
> function String hello(String name) {
>
>     return "Hello "+name+"!";
>
> }
>
> .
>
> The declared Type will be used  in the java code :
>
> // handle the type as necessary:
>
> // create instances:
>
> Object vars = varHolderTyp.newInstance();
>
> // set attributes values
>
> varHolderTyp.setFromMap(vars,varMap);
>
> // insert fact into a session
>
> StatefulKnowledgeSession ksession = ...
>
> ksession.insert( vars );
>
>  When it comes to the “setFromMap”, then I get a ClassCastException for
> the VarHolderTyp. But when I remove the declaration of the function in the
> rule file, then everything works fine (all variables will be filled
> correctly). It seems, that the reflection mechanism will not work
> correctly, when drools want to create the Pojo for VarHolder and the
> Static Method for the function. But it s very difficult to debug, because
> the exception fires in the drools engine.
>
> Maybe I’ve make a mistake so anyone  knows a solution for this problem or
> can tell me, where my mistake is. It will be nice, when I can declare a
> type and a function together in one rule file.  At the moment, I created a
> java class for VarHolder, so the exception does not appear, but I m losing
> a lot of dynamic.
>
> Please give me a hint
>
> _______________________________________________
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> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>


-- 
 Edson Tirelli
 JBoss Drools Core Development
 JBoss, a division of Red Hat @ www.jboss.com
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