[rules-users] Accumulate in Drools

[Edson Tirelli]

   knowledgeBuilder.getErrors()

   Edson

2010/8/16 Manav <manav7574 at yahoo.com>

> Thanks Edson.
>
> I don't why but when i am using the below rule in my drl it's failing to
> compile.
> Not sure if i am doing something stupid or this is an issue with
> environment or the drl.
>
> I am attaching the drl file with the mail. The error that i get is : -
>
>
> testTestsRulesEngine(
> *suitability.TestsRulesEngineTest)suitability.RulesEngineException*: Could
> not load/compile rules file: testAccumulate.drl
>
> at suitability.RulesEngine.<init>(
> *RulesEngine.java:39*)
>
> at suitability.TestsRulesEngine.<init>(
> *TestsRulesEngine.java:13*)
>
> at suitability.TestsRulesEngineTest.setUp(
> *TestsRulesEngineTest.java:72*)
>
> Caused by:
> *java.lang.NullPointerException*
>
> at org.drools.common.AbstractRuleBase.addPackages(
> *AbstractRuleBase.java:434*)
>
> at org.drools.reteoo.ReteooRuleBase.addPackage(
> *ReteooRuleBase.java:388*)
>
> at suitability.RulesEngine.<init>(
> *RulesEngine.java:36*)
>
> ... 14 more
>
> Regards,
> Manav
>
>  ------------------------------
> *From:* Edson Tirelli <tirelli at post.com>
> *To:* Manav <manav7574 at yahoo.com>; Rules Users List <
> rules-users at lists.jboss.org>
> *Sent:* Mon, August 16, 2010 7:46:54 PM
> *Subject:* Re: [rules-users] Accumulate in Drools
>
>      You can't use the cast and the method call in a regular constraint.
> You can use it as part of an expression. So:
>
>  $min_score : Number ()
>    from accumulate (Client (productTypeExperience.keySet contains $name,
>                      $score : productTypeExperience[$name],
>                      min ( ((ExperienceLevel)$score).value() ) )
>
>      We are working on the support of free form expressions on constraints
> for Drools 6 (not sure we can make it for 5.2).
>
>      Edson
>
>
> 2010/8/15 Manav <manav7574 at yahoo.com>
>
>> Hi,
>> I am trying my hand at the accumulate function in Drools 5.x but the drl
>> fails
>> to compile.
>> Not sure what's wrong with it. Please help.
>> This is the sample that i am working with
>>
>> rule "Test Accumulate Function"
>> when
>>  $p : ProductType ($name : name)
>>  $min_score : Number ()
>>    from accumulate (Client (productTypeExperience.keySet contains $name,
>>                      $score :
>> ((ExperienceLevel)productTypeExperience[$name]).value()),
>>               min ($score))
>> then
>>  System.out.println ("$min_score" + $min_score);
>> end
>> Regards,
>> Manav
>>
>>
>>
>>
>> _______________________________________________
>> rules-users mailing list
>> rules-users at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>
>
>
> --
>   Edson Tirelli
>   JBoss Drools Core Development
>   JBoss by Red Hat @ www.jboss.com
>
>


-- 
  Edson Tirelli
  JBoss Drools Core Development
  JBoss by Red Hat @ www.jboss.com
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