[rules-users] Problem with Banking Tutorial

[Wolfgang Laun]

IIRC, this was a bug one or two minor versions ago. What version are you using?
-W

On 18/04/2013, Stefan Schuster <stefan.m.schuster at gmail.com> wrote:
> For the sake of  completeness, here is also the RuleRunner class used in
> this example:
>
> package org.drools.tutorials.banking;
>
> import java.util.Collection;
>
> import org.drools.KnowledgeBase;
> import org.drools.KnowledgeBaseFactory;
> import org.drools.builder.KnowledgeBuilder;
> import org.drools.builder.KnowledgeBuilderFactory;
> import org.drools.builder.ResourceType;
> import org.drools.definition.KnowledgePackage;
> import org.drools.io.ResourceFactory;
> import org.drools.runtime.StatefulKnowledgeSession;
>
> public class RuleRunner {
>
>     public RuleRunner() {
>     }
>
>     public void runRules(String[] rules,
>                          Object[] facts) {
>
>         KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
>         KnowledgeBuilder kbuilder =
> KnowledgeBuilderFactory.newKnowledgeBuilder();
>
>         for ( int i = 0; i < rules.length; i++ ) {
>             String ruleFile = rules[i];
>             System.out.println( "Loading file: " + ruleFile );
>             kbuilder.add( ResourceFactory.newClassPathResource( ruleFile,
>
> RuleRunner.class ),
>                                   ResourceType.DRL );
>         }
>
>         Collection<KnowledgePackage> pkgs =
> kbuilder.getKnowledgePackages();
>         kbase.addKnowledgePackages( pkgs );
>         StatefulKnowledgeSession ksession =
> kbase.newStatefulKnowledgeSession();
>
>         for ( int i = 0; i < facts.length; i++ ) {
>             Object fact = facts[i];
>             System.out.println( "Inserting fact: " + fact );
>             ksession.insert( fact );
>         }
>
>         ksession.fireAllRules();
>     }
> }
>
>
> 2013/4/18 Stefan Schuster <stefan.m.schuster at gmail.com>
>
>> Hello,
>>
>> I have a problem with the banking tutorial number 3, which is part of the
>> examples of drools expert.
>> It simply adds some Numbers as facts, and retracts them in an increasing
>> order.
>>
>> It is very short, therefore I post the whole Code:
>>
>>
>> BankingExample3.java
>> _________________________________________________
>> package org.drools.tutorials.banking;
>>
>> public class BankingExample3 {
>>     public static void main(String[] args) {
>>         Number[] numbers = new Number[] {wrap(3), wrap(1), wrap(4),
>> wrap(1), wrap(5)};
>>         new RuleRunner().runRules( new String[] { "Example3.drl" },
>>                                    numbers );
>>     }
>>
>>     private static Integer wrap(int i) {
>>         return new Integer(i);
>>     }
>> }
>> _________________________________________________
>>
>>
>>
>> Example3.drl:
>> _________________________________________________
>> package org.drools.tutorials.banking
>>
>> rule "Rule 01"
>>     when
>>         $number : Number()
>>         not Number( intValue < $number.intValue )
>>     then
>>         System.out.println("Number found with value: " +
>> $number.intValue() );
>>         retract( $number );
>> end
>> _________________________________________________
>>
>>
>> Output:
>> _________________________________________________
>> Loading file: Example3.drl
>> Inserting fact: 3
>> Inserting fact: 1
>> Inserting fact: 4
>> Inserting fact: 1
>> Inserting fact: 5
>> Number found with value: 1
>> Number found with value: 1
>> Number found with value: 3
>> Number found with value: 4
>> Number found with value: 5
>> _________________________________________________
>>
>>
>> that seams absolute logically to me.
>> But now I alter the Numbers in the Java-Part:
>>  Number[] numbers = new Number[] {wrap(3), wrap(1), wrap(2)};
>>
>> and the output destroys everything I thought I understood:
>> Loading file: Example3.drl
>> Inserting fact: 3
>> Inserting fact: 1
>> Inserting fact: 2
>> Number found with value: 1
>> Number found with value: 3
>> Number found with value: 2
>>
>>
>> Can someone  reproduce this behavior?? It seams absolutely strange to me.
>> I would have expected the order 1,2,3. Any explanations?
>>
>> Thanks in advance for helping me!
>>
>>
>>
>