[rules-users] Getting java.lang.ClassCastException: - using Drools 5.3

[Wolfgang Laun]

This is a bug in the DRL parser/builder. Even when you (as you should)
omit the parentheses around the patterns "Medication" and "Procedure"
(see below) you get the same exception:

 (   $Dx1 :  Medication( name == "Oflo" )
     and
     eval($x.check($Dx1) )
)
 or
(   $Dx2 : Procedure( name == "Pre" )
    and
    eval($x.checks($Dx2) )
)

However, you can use a workaround with the semantically equivalent inline eval:

 (   $Dx1 : Medication( name == "Oflo", eval($x.check($Dx1) )
     or
     $Dx2 : Procedure( name == "Pre", eval($x.checks($Dx2) )    )

Note: The similarity between treatment by Medication and Procedure
suggests that there should be an interface Treatment implemented by
both, so you might simplify this to

     $Dx1: Treatment( name == "Oflo" || == "Pre", eval( $x.checks( $Dx1 ) )

-W

On 29/02/2012, kashif10 <kash452 at yahoo.com> wrote:
> HI.
> I am getting following exception.
>
> Exception in thread "main" org.drools.RuntimeDroolsException:
> d1.rule.Rule_8f09c0aa350100000080cb1e0dd40f6fEval4Invoker at f6f66af4 :*
> java.lang.ClassCastException: d1.rule.facts.Medication cannot be cast to
> d1.rule.facts.Procedure*
> 	at org.drools.rule.EvalCondition.isAllowed(EvalCondition.java:119)
> 	at
> org.drools.reteoo.EvalConditionNode.assertLeftTuple(EvalConditionNode.java:178)
> 	at
> org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:197)
> 	at
> org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:72)
> 	at org.drools.reteoo.JoinNode.assertObject(JoinNode.java:161)
> 	at
> org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:458)
> 	at
> org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:386)
> 	at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:134)
> 	at
> org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:59)
> 	at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:215)
> 	at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:244)
> 	at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:330)
> 	at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:291)
> 	at
> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:886)
> 	at
> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:845)
> 	at
> org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:255)
> 	at d1.rule.facts.PatientFacts.loadFactsInSession(PatientFacts.java:6075)
> 	at d1.rule.DREvaluator.startEvaluation(DREvaluator.java:278)
> 	at d1.rule.DREvaluator.main(DREvaluator.java:72)
> Caused by: java.lang.ClassCastException: d1.rule.facts.Medication cannot be
> cast to d1.rule.facts.Procedure
> 	at
> d1.rule.Rule_8f09c0aa350100000080cb1e0dd40f6fEval4Invoker.evaluate(Unknown
> Source)
> 	at org.drools.rule.EvalCondition.isAllowed(EvalCondition.java:114)
>
>
>
> Following is the rule. I found that due to "or" the Procedure block not
> runs.
> If I change "or" to "and" than procedure block executed & the error not
> produced.
> I am not sure what's the problem, I am using Drool 5.3
>
>   rule "8f09c0aa350100000080cb1e0dd40f6f"
>
>     when    #conditions
>
>     (
>
> 		$cepFacts: CEPFacts(id=="D1")
> 		and
> 		eval($cepFacts.initialize())
> 		
> 		and
>
> 	    (
> 	         (
> 	    	     $DxDate_1 : ( Medication( name equalsIgnoreCase "Ofloxacin" )  )
> 	    	     and
> 	    	     eval($cepFacts.checkRelativeValues($DxDate_1) )
> 	    	)
> 	    	or
> 	    	(
> 	    	
> 	    	    $DxDate_2 : ( Procedure( name equalsIgnoreCase "Pres antibiotic" )
> )
> 	    	    and
> 	    	    eval($cepFacts.checkRelativeValues($DxDate_2) )
> 	    	)
> 	    )
> 	    and
> 	    (
> 	    	
> 	    	$DxDate_3 : ( Medication( name equalsIgnoreCase "Trazodone" ) )
> 	    	and
> 	    	eval($cepFacts.checkTimeIs($DxDate_3)
> 	    		
> 	    )
>
>     )
>     then
>     	
>     	resultIds.add("8f09c0aa350100000080cb1e0dd40f6f");
>     	
>       end
>
> --
> View this message in context:
> http://drools.46999.n3.nabble.com/Getting-java-lang-ClassCastException-using-Drools-5-3-tp3785966p3785966.html
> Sent from the Drools: User forum mailing list archive at Nabble.com.
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