[rules-users] Facing Problem in BRL

Wed May 18 04:53:20 EDT 2011

I assigned a variable also but I am still getting the error:

java.lang.RuntimeException: [4] Unable to expand: $person : PersonDetails
( $age : age < "20" )[6] Unable to expand: 		$person.setDiscount
( 10 );

Also the generated drl looks fine:

rule "example"
	dialect "mvel"
	when
		$person : PersonDetails( $age : age < "20" )
	then
		$person.setDiscount( 10 );
end

(Embedded image moved to file: pic02961.jpg)
Regards,
Sumeet Karawal
Mailto: sumeet.karawal at tcs.com

  From:       Wolfgang Laun <wolfgang.laun at gmail.com>                                                                  

  To:         Rules Users List <rules-users at lists.jboss.org>                                                           

  Date:       05/18/2011 01:42 PM                                                                                      

  Subject:    Re: [rules-users] Facing Problem in BRL                                                                  

  Sent by:    rules-users-bounces at lists.jboss.org                                                                      

It would help to see the "BRL Source" and the "Generated DRL". Change views
at the bottom of the window.
-W

2011/5/18 Abhay B. Chaware <Abhay.Chaware at kpitcummins.com>
  Also, if I understand correctly what you are trying to do, you should
  probably add a variable name to the PersonDetails fact and use that in
  the "then" part to assign the discount. See attached.

  (Embedded image moved to file: pic00224.jpg)

  -----Original Message-----
  From: rules-users-bounces at lists.jboss.org [mailto:
  rules-users-bounces at lists.jboss.org] On Behalf Of Sumeet Karawal
  Sent: Wednesday, May 18, 2011 11:47 AM
  To: Rules Users List
  Subject: Re: [rules-users] Facing Problem in BRL

  This is the brl that I have created:

  (Embedded image moved to file: pic18001.jpg)

  Regards,

  Sumeet Karawal

  Mailto: sumeet.karawal at tcs.com

    From:       "Abhay B. Chaware" <Abhay.Chaware at kpitcummins.com
  >

    To:         Rules Users List <rules-users at lists.jboss.org
  >

    Date:       05/18/2011 11:42
  AM                                                                                     

    Subject:    Re: [rules-users] Facing Problem in
  BRL

    Sent by:    rules-users-bounces at lists.jboss.org

  Could you post your rule content here ?

  -----Original Message-----

  From: rules-users-bounces at lists.jboss.org [

  mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Sumeet Karawal

  Sent: Wednesday, May 18, 2011 11:38 AM

  To: rules-users at lists.jboss.org

  Subject: [rules-users] Facing Problem in BRL

  Hi,

  I am using Drools-Expert. I am having a class "Person" with data members
  as

  age and discount.

  I am trying to create a .brl. I have these statements in drools.package

  package com.rules;

  import com.model.PersonDetails;

  and in the example.brl I am providing the details of when and then

  conditions

  but on execution I am getting the following error :

  java.lang.RuntimeException: [4] Unable to expand: PersonDetails( age <

  "20" )[6] Unable to expand:                      PersonDetails fact0 =
  new

  PersonDetails

  ();[7] Unable to expand:                         fact0.setDiscount

  ( 10 );[8] Unable to

  expand:                        insert(fact0 );

  It would be helpful is somebody guide me on how execute it.

  Also, I am creating the knowledgebase as:

  private static KnowledgeBase createKnowledgeBase() {

   KnowledgeBuilder builder = KnowledgeBuilderFactory.newKnowledgeBuilder
  ();

      builder.add (ResourceFactory.newClassPathResource(

  "com/rules/example.brl"),ResourceType.BRL);

      if (builder.hasErrors()) {

        throw new RuntimeException (builder.getErrors().toString ());

      }

      KnowledgeBase knowledgeBase = KnowledgeBaseFactory.newKnowledgeBase
  ();

      knowledgeBase.addKnowledgePackages(builder.getKnowledgePackages ());

      return knowledgeBase;}

  Thanks & Regards,

  Sumeet Karawal

  CEG - Open Source Technology Group

  Tata Consultancy Services

  Ph:- +912267782556

  Cell:- +919833236440

  Mailto: sumeet.karawal at tcs.com

  Website: http://www.tcs.com

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