[rules-users] class Cast Exception when using OR (||) - Bug?

[Edson Tirelli]

    Arjun

    It is a bug since a more friendly message should be raised at compile
time stating that your "contact" declaration is not available in one of your
logical branches.
    Having said that, what you want to do is make your OR take priority over
the implicit AND and as such, you need to add () around the OR:

When
contact:Contact (initialized==true)
exr: ( Relation( contact==cntct,
               active:active==$1,
               relationName=="Old")
or Relation( contact==cntct,
               active:active==$1,
               relationName==null) )
Then
    contact.getStatus().setStatus(true);
    contact.getStatus().addToReasonTrace(drools.getRule().getName());
end

   Having said that, better yet for you would not to use the OR CE, but to
use restriction connectives. This would be the most efficient (and clean)
way of writing your rule:

When
contact:Contact (initialized==true)
exr: Relation( contact==cntct,
               active:active==$1,
               relationName =="Old" || == null )
Then
    contact.getStatus().setStatus(true);
    contact.getStatus().addToReasonTrace(drools.getRule().getName());
end

   As a syntax sugar, you could also write:

exr: Relation( contact==cntct,
               active:active==$1,
               relationName in ( "Old", null ) )

   Can you please open a JIRA with your test case for the bug?
   Thank you,
        Edson

2007/7/30, Arjun Dhar <dhar_ar at yahoo.com>:
>
> When I define a rule:
>
> When
> cntct:Contact (initialized==true)
> exr:Relation( contact==cntct,
>                active:active==$1,
>                relationName=="Old")
> Then
> contact.getStatus().setStatus(true);
> contact.getStatus().addToReasonTrace(drools.getRule().getName());
> end
>
> ..The bove works.
>
> BUT, when I do the following:
>
> When
> cntct:Contact (initialized==true)
> exr:Relation( contact==cntct,
>                active:active==$1,
>                relationName=="Old")
> || Relation( contact==cntct,
>                active:active==$1,
>                relationName==null)
> Then
> contact.getStatus().setStatus(true);
> contact.getStatus().addToReasonTrace(drools.getRule().getName());
> end
> ... The script compiles anda stateless Session is created successfully,
> but at
> runtime/execution it fails with the exception:
> java.lang.ClassCastException: com.arjun.brms.businessObjects.Contact
> org.drools.rule.EvalCondition.isAllowed(EvalCondition.java:75)
> org.drools.reteoo.EvalConditionNode.assertTuple(EvalConditionNode.java
> :141)
> org.drools.reteoo.SingleTupleSinkAdapter.propagateAssertTuple
> (SingleTupleSinkAdapter.java:20)
> org.drools.reteoo.JoinNode.assertTuple(JoinNode.java:120)
> org.drools.reteoo.SingleTupleSinkAdapter.propagateAssertTuple
> (SingleTupleSinkAdapter.java:20)
> org.drools.reteoo.JoinNode.assertObject(JoinNode.java:162)
> org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject
> (CompositeObjectSinkAdapter.java:317)
> org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:130)
> org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject
> (CompositeObjectSinkAdapter.java:308)
> org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:130)
> org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject
> (CompositeObjectSinkAdapter.java:308)
> org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:168)
> org.drools.reteoo.Rete.assertObject(Rete.java:168)
> org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:190)
> org.drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java
> :70)
> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java
> :848)
> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java
> :822)
> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java
> :623)
>
> Class diagram:
> ~~~~~~~~~~~~~~~~
> Contact<-- bi-directional association -->List<Relation>
>
> Please advise! is this a bug?
>
> thanks,
> Arjun
>
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>



-- 
  Edson Tirelli
  Software Engineer - JBoss Rules Core Developer
  Office: +55 11 3529-6000
  Mobile: +55 11 9287-5646
  JBoss, a division of Red Hat @ www.jboss.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.jboss.org/pipermail/rules-users/attachments/20070730/7912f166/attachment.html