Re: [rules-users] ClassCastException during inserting knowledge package

Thu, 22 Apr 2010 01:23:07 -0700

I've downloaded last stable build (number 3845, made 2010-04-14) from Drools Hudson (http://hudson.jboss.org/hudson/job/drools/). After running my tests I got same problem (but little different StackTrace): 

java.lang.ClassCastException: org.drools.core.util.ObjectHashMap
    at org.drools.reteoo.AlphaNode.updateSink(AlphaNode.java:172)
    at org.drools.reteoo.BetaNode.attach(BetaNode.java:214)
    at org.drools.reteoo.builder.BuildUtils.attachNode(BuildUtils.java:160)
at org.drools.reteoo.builder.GroupElementBuilder$NotBuilder.build(GroupElementBuilder.java:281) at org.drools.reteoo.builder.GroupElementBuilder.build(GroupElementBuilder.java:77) at org.drools.reteoo.builder.GroupElementBuilder$AndBuilder.build(GroupElementBuilder.java:130) at org.drools.reteoo.builder.GroupElementBuilder.build(GroupElementBuilder.java:77) at org.drools.reteoo.builder.ReteooRuleBuilder.addSubRule(ReteooRuleBuilder.java:155) at org.drools.reteoo.builder.ReteooRuleBuilder.addRule(ReteooRuleBuilder.java:128) 
    at org.drools.reteoo.ReteooBuilder.addRule(ReteooBuilder.java:117)
    at org.drools.reteoo.ReteooRuleBase.addRule(ReteooRuleBase.java:409)
at org.drools.common.AbstractRuleBase.addRule(AbstractRuleBase.java:638) at org.drools.common.AbstractRuleBase.addPackages(AbstractRuleBase.java:520) at org.drools.reteoo.ReteooRuleBase.addPackages(ReteooRuleBase.java:426) at org.drools.impl.KnowledgeBaseImpl.addKnowledgePackages(KnowledgeBaseImpl.java:121) 

Maybe I should download Drools from other place?

Piotr




On 2010-04-21 19:37, Edson Tirelli wrote:



   This is related to the problem in your other e-mail and it is fixed 
in trunk.


   Edson


2010/4/21 Piotr Jedrychowski <[email protected] 
<mailto:[email protected]>>


    Hello.

    I have a problem with such scenario:

    1) add one knowledge package (sensor200) with two rules:

    package sensor200
    rule "Sensor-200-ON"
    when
    (and f0: FMSensorFact(id==201) f1: FMSensorFact(id==202) )
    (not FMFact(id==200))
    then
    FMFact factToInsert = new FMFact(200);
    insert(factToInsert);
    end

    package sensor200
    rule "Sensor-200-OFF"
    when
    not (and FMSensorFact(id==201) FMSensorFact(id==202) )
    (factToRetract : FMFact(id==200))
    then
    retract(factToRetract);
    end

    2) remove knowledge package (sensor200)

    3) add knowledge package with the same name as in point 1, but with
    other rule:

    package sensor200
    rule "Sensor-200-OR-201-ON"
    when
    fact: FMSensorFact(id==201)
    (not FMFact(id==200))
    then
    FMFact factToInsert = new FMFact(200);
    insert(factToInsert);
    end

    During adding knowledge package in point 3, I'm getting
    ClassCastException with this Stacktarce:

    java.lang.ClassCastException: org.drools.util.ObjectHashMap
     at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:142)
     at
    org.drools.reteoo.ObjectTypeNode.updateSink(ObjectTypeNode.java:252)
     at org.drools.reteoo.AlphaNode.attach(AlphaNode.java:133)
     at
    org.drools.reteoo.builder.BuildUtils.attachNode(BuildUtils.java:160)
     at
    
org.drools.reteoo.builder.PatternBuilder.attachAlphaNodes(PatternBuilder.java:295)
     at
    
org.drools.reteoo.builder.PatternBuilder.attachPattern(PatternBuilder.java:117)
     at
    org.drools.reteoo.builder.PatternBuilder.build(PatternBuilder.java:70)
     at
    
org.drools.reteoo.builder.GroupElementBuilder$NotBuilder.build(GroupElementBuilder.java:228)
     at
    
org.drools.reteoo.builder.GroupElementBuilder.build(GroupElementBuilder.java:73)
     at
    
org.drools.reteoo.builder.GroupElementBuilder$AndBuilder.build(GroupElementBuilder.java:126)
     at
    
org.drools.reteoo.builder.GroupElementBuilder.build(GroupElementBuilder.java:73)
     at
    
org.drools.reteoo.builder.ReteooRuleBuilder.addSubRule(ReteooRuleBuilder.java:153)
     at
    
org.drools.reteoo.builder.ReteooRuleBuilder.addRule(ReteooRuleBuilder.java:126)
     at org.drools.reteoo.ReteooBuilder.addRule(ReteooBuilder.java:117)
     at org.drools.reteoo.ReteooRuleBase.addRule(ReteooRuleBase.java:362)
     at
    org.drools.common.AbstractRuleBase.addRule(AbstractRuleBase.java:618)
     at
    org.drools.common.AbstractRuleBase.addPackages(AbstractRuleBase.java:500)
     at
    org.drools.reteoo.ReteooRuleBase.addPackages(ReteooRuleBase.java:379)
     at
    
org.drools.impl.KnowledgeBaseImpl.addKnowledgePackages(KnowledgeBaseImpl.java:121)

    Maybe someone had similar problem and could help me?

    I'm using:
    * JBoss 4.2.3.GA <http://4.2.3.GA>
    * Drools 5.0

    Regards,
    Piotr
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--
 Edson Tirelli
 JBoss Drools Core Development
 JBoss by Red Hat @ www.jboss.com <http://www.jboss.com>


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