[rules-users] Problem with Banking Tutorial

[Wolfgang Laun]

On 18/04/2013, Stefan Schuster <stefan.m.schuster at gmail.com> wrote:
>
> Please don't misunderstand me, I have a deep respect for the developer of
> such complex systems like DROOLS, and  I know from my own code that bugs
> simply happen. But I wonder why there is still this version without any
> warning the official release?
>

Not putting out warnings when some release is known to be broken is a
rather dark spot on the gloss of Drools. I have urged this before,
mainly because
not warning users is a primary cause for them wasting time and effort.

Keep carping...
Wolfgang




> Is it better to use an older version?
>
> best regards
>
> Stefan
>
>
>
>
> 2013/4/18 Mark Proctor <mproctor at codehaus.org>
>
>> There are a lot of fixes in the 5.x master. Anyone verified their bugs
>> against this? I suspect this is fixed in that.
>>
>>
>> Mark
>> On 18 Apr 2013, at 16:21, Wolfgang Laun <wolfgang.laun at gmail.com> wrote:
>>
>> > Ah, my memory :-)
>> >
>> > http://lists.jboss.org/pipermail/rules-dev/2013-January/004338.html
>> >
>> > Mark has promised a fix for 3 months ago, but of course 5.5.0 remains
>> broken.
>> >
>> > -W
>> >
>> > On 18/04/2013, Stefan Schuster <stefan.m.schuster at gmail.com> wrote:
>> >> Hi, thank you for your response.
>> >> I'm using the latest stable release of Drools 5.5.0 final.
>> >> Eclipse is Juno Service Release 2.
>> >>
>> >> Can you confirm, that the order 1,2,3 is the expected result?
>> >>
>> >> If this is a known bug, is there some kind of jira or bugzilla numer
>> >> assigned to it?
>> >>
>> >>
>> >>
>> >> 2013/4/18 Wolfgang Laun <wolfgang.laun at gmail.com>
>> >>
>> >>> 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!
>> >>>>>
>> >>>>>
>> >>>>>
>> >>>>
>> >>> _______________________________________________
>> >>> rules-users mailing list
>> >>> rules-users at lists.jboss.org
>> >>> https://lists.jboss.org/mailman/listinfo/rules-users
>> >>>
>> >>
>> > _______________________________________________
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>>
>>
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