Edson,

As you said i used inline eval. But am getting erroe message like this can't be used in static context.am using statelesssession to assert my objects.

i also put eval(this!=obj1) as follows.

  $obj1:Object1($id:id,$name:name)
  $obj2:Object1(id==$id,$name:name==$name, eval( this!=$obj1 ))  eval($obj2!=  $obj1)

Though my references are different the rule is not firing


Thanks and Regs

Basha

From: rules-users-bounces@lists.jboss.org on behalf of Edson Tirelli
Sent: Tue 11/13/2007 9:35 PM
To: Rules Users List
Subject: Re: [rules-users] RE: how to find duplicate




   Sikkandar,

   The only way to check for identity is to use an inline eval and use java code to check that:

when
        $obj1:Object1($id:id,$name:name)
        $obj2:Object1(id==$id,$name:name==$name, eval( this!=$obj1 ))
then

   Another option is to configure your rulebase to not allow the same object to be matched by more than one pattern in your rules. To do that you can either set a system property:

drools.removeIdentities = true

    Or you can use drools API:

RuleBaseConfiguration conf = new RuleBaseConfiguration();
conf.setRemoveIdentities( true );
RuleBase rulebase = RuleBaseFactory.newRuleBase( conf );

    If you do that, your rule can be written as this:

when
        $obj1:Object1($id:id,$name:name)
        $obj2:Object1(id==$id,$name:name==$name)
then

   Since the engine will never allow the same fact to simultaneously match both patterns.

   []s
   Edson





2007/11/13, Sikkandar Nawabjan <Sikkandar.Nawabjan@ust-global.com>:

        Hi,
        am passing list of objects to working memory. i want to fire the rule if there is any duplicate objects in the list

        i write code like this

        when
                $obj1:Object1($id:id,$name:name)
                $obj2:Object1(id==$id,$name:name==$name,this!=$obj1)
        then
          fire rule

        Now the problem lies at this!=objj1(a highlighted check). i put this to avoid a object check with itself.
        But this is internally calling equals method of the corresponding object and always return true. Because i overriden equals method in the Object itself
        so at the end the rule won't fire even if there is a duplicate object. how i can solve this

        equals(Object obj){
        if(this.id=obj.id&& this.name==obj.name)
          return true;
        else
          return false;
        }




        ________________________________

        From: rules-users-bounces@lists.jboss.org on behalf of rules-users-request@lists.jboss.org
        Sent: Tue 11/13/2007 2:04 AM
        To: rules-users@lists.jboss.org
        Subject: rules-users Digest, Vol 12, Issue 27



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        Today's Topics:

           1. Re: Drools and jBPM integration (Fabian Weisensee)
           2. Re: java.lang.OutOfMemoryError : Java heap space (Edson Tirelli)
           3. Re: Drools and jBPM integration (Mark Proctor)
           4. Re: Drools and jBPM integration (Mark Proctor)


        ----------------------------------------------------------------------

        Message: 1
        Date: Mon, 12 Nov 2007 18:23:06 +0100
        From: Fabian Weisensee <fabian@weisensee.net>
        Subject: Re: [rules-users] Drools and jBPM integration
        To: Rules Users List < rules-users@lists.jboss.org <mailto:rules-users@lists.jboss.org> >
        Message-ID: < 47388BFA.3010009@weisensee.net>
        Content-Type: text/plain; charset=ISO-8859-1; format=flowed

        Yes, thanks for your help. I'll try your suggestion for #2.

        I resolved the deployment problem by myself. It was just a mistake with
        the JBoss ESB deploying...

        But now I have another problem. The rule file is found, but there seem
        to be some problems with the parser.

        The FireRulesActionHandler class from the jbpm wiki uses the following code:
        RuleBaseImpl ruleBase = new RuleBaseImpl();
        ruleBase.addPackage(pkg);

        But the RuleBaseImpl class doesn't seem to be part of drools anymore. I
        looked at the javadocs to find a replacement. I've found the
        RuleBaseLoader class which looked like what I needed. I replaced the two
        lines with this:
        RuleBaseLoader rbl = RuleBaseLoader.getInstance();
        RuleBase ruleBase = rbl.loadFromReader(reader);
        ruleBase.addPackage(pkg);

        but when I run this I get the following error:

        ERROR [GraphElement] action threw exception: Unable to parser Reader
        java.lang.RuntimeException : Unable to parser Reader
                at org.drools.compiler.DrlParser.getParser(DrlParser.java:209)
                at org.drools.compiler.DrlParser.parse(DrlParser.java:60)
                at
        org.drools.compiler.PackageBuilder.addPackageFromDrl (PackageBuilder.java:165)
                at
        org.drools.compiler.RuleBaseLoader.loadFromReader(RuleBaseLoader.java:38)
                at
        rechnung.kontrolle.FireRulesActionHandler.readRule(FireRulesActionHandler.java:92)
                at
        rechnung.kontrolle.FireRulesActionHandler.execute(FireRulesActionHandler.java :49)

        Of course I thought my rule file would be syntacticaly incorrect, but
        even this rule file didn't work:

        package rechnung.kontrolle

        rule "test rule 1"
                when
                then
                        System.out.println("rule fired!");
        end

        What am I doing wrong? Is RulesBaseLoader the right class?
        Are there any other Informations about integrating jBPM and Drools?

        --Fabian



        Aziz Boxwala schrieb:
        > Fabian,
        >
        > Response to #1: I believe the rule file needs to reside in the root
        > directory of the archive/directory of the example application. I have
        > not tried that out so not sure.
        >
        > With Drools 4.0.x, you have the option of having your rules be located
        > in the BRMS.
        >
        > Response to #2: You should be able to do so using one decision-node.
        > Associate the rule action handler with either the Before Signal or Node
        > Enter event and specify your decision conditions on the transitions out
        > of that node..
        >
        > --Aziz
        >
        > ----- Original Message ----
        > From: Fabian Weisensee <fabian@weisensee.net>
        > To: rules-users@lists.jboss.org
        > Sent: Monday, November 12, 2007 7:35:02 AM
        > Subject: [rules-users] Drools and jBPM integration
        >
        > Hi there
        >
        > I have some questions concerning Drools and jBPM integration.
        > I know there is this wiki page:
        > http://wiki.jboss.org/wiki/Wiki.jsp?page=JbpmAndDrools
        > but first it's not really detailed and second does it seem to be outdated.
        >
        > 1) I changed the FireRulesActionHandler from the wiki to reflect the
        > API-changes, that at least it's compileable. In the jBPM process
        > definition the rule file is simply passed as parameter like this:
        > "/Shipper.drl". To which directory does this relative path apply? So
        > where do I have to deploy this rule file? I tried several locations in
        > the application server, but even with an absolute path every time
        > FireRulesActionHandler tries to read the rule it crashes:
        >
        > ERROR [GraphElement] action threw exception: null
        > java.lang.NullPointerException
        >     at java.io <http://java.io/>  <http://java.io.Re <http://java.io.re/>  < http://java.io.re/ <http://java.io.re/> > >.Reader.<init>(Unknown Source)
        >     at java.io <http://java.io/ >  <http://java.io.In <http://java.io.in/>  <http://java.io.in/ > >.InputStreamReader.<init>(Unknown Source)
        >     at
        > rechnung.kontrolle.FireRulesActionHandler.readRule(FireRulesActionHandler.java:83)
        >     at
        > rechnung.kontrolle.FireRulesActionHandler.execute (FireRulesActionHandler.java :50)
        >
        > 2) As I understood the example in the wiki you have to create a node
        > which executes the rule and then a decision-node which routes the
        > process flow according to the rule results.
        > Is it possible to do this with just one node?
        > But perhaps I should ask this at the jBPM forums.
        >
        > Every help would be appreciated. Thanks in advance.
        >
        > Fabian Weisensee
        > _______________________________________________
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        > rules-users@lists.jboss.org <mailto:rules-users@lists.jboss.org>
        > https://lists.jboss.org/mailman/listinfo/rules-users
        >
        >
        > ------------------------------------------------------------------------
        >
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        > https://lists.jboss.org/mailman/listinfo/rules-users


        ------------------------------

        Message: 2
        Date: Mon, 12 Nov 2007 16:35:56 -0200
        From: "Edson Tirelli" <tirelli@post.com >
        Subject: Re: [rules-users] java.lang.OutOfMemoryError: Java heap space
        To: "Rules Users List" <rules-users@lists.jboss.org>
        Message-ID:
                < e6dd5ba30711121035j634309ebq14f21d73ad68ce36@mail.gmail.com <mailto: e6dd5ba30711121035j634309ebq14f21d73ad68ce36@mail.gmail.com> >
        Content-Type: text/plain; charset="iso-8859-1"

           Thanks for reporting and providing workaround. I will look into fixing
        that.




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