[rules-users] ClassCastException using memberOf operator

[Marco Malziotti]

Thanks Wolfgang
In addition to using 'memberOf' operator, there is a way to retain in 
RHS result from makeA(), without calling one more time makeA() function 
?
In consequence (then) of my example I want print 'a' that already holds 
(?) the function result.
Once again thanks.

Marco

On Wed, 23 Jan 2013 17:49:04 +0100, Wolfgang Laun wrote:
> The simple
>   i: Item ( f memberOf (makeA()) )
> should do.
> -W
>
> On 23/01/2013, Marco Malziotti <marco.malziotti at trs.it> wrote:
>> Hello
>> I am a beginner in Drools 5.1.1 and try to use 'memberOf' operator.
>> Simply I want check whether a short field 'f' (belonging to Item 
>> class)
>> is a member of an array 'a': retrieved by a function 'makeA'.
>> In my .drl file I try with :
>>
>> function Short[] makeA() {
>>    return  (new Short[] {1, 2, 3} );
>> }
>>
>> rule "chek"
>> when
>>    a: Short[]() from makeA()
>>    i: Item ( f memberOf a )
>> then
>> ... 'f' is member of array 'a' !
>> end
>>
>> I have following stack trace:
>> java.lang.ClassCastException: Can't check if an attribute is member 
>> of
>> an object of class class java.lang.Short
>> at
>> 
>> org.drools.base.evaluators.SetEvaluatorsDefinition$BaseMemberOfEvaluator.evaluateCachedRight(SetEvaluatorsDefinition.java:532)
>> at
>> 
>> org.drools.rule.VariableRestriction.isAllowedCachedRight(VariableRestriction.java:117)
>> at
>> 
>> org.drools.rule.VariableConstraint.isAllowedCachedRight(VariableConstraint.java:121)
>> at
>> 
>> org.drools.common.SingleBetaConstraints.isAllowedCachedRight(SingleBetaConstraints.java:151)
>> at org.drools.reteoo.JoinNode.assertObject(JoinNode.java:125)
>> at
>> 
>> org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:59)
>> at
>> 
>> org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:190)
>> at
>> 
>> org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:145)
>> at
>> 
>> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1174)
>> at
>> 
>> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1123)
>> at
>> 
>> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:917)
>> at
>> 
>> org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:251)
>>
>> In :
>> 
>> http://lists.jboss.org/pipermail/rules-users/2008-October/006746.html
>> and
>> 
>> http://lists.jboss.org/pipermail/rules-users/2007-September/003010.html
>> I haven't found the solution to my problem.
>>
>> I don't know if it is already open a related issue.
>>
>> Thanks for your attention.
>> Regards.
>>
>> Marco Malziotti
>> Tecnologie nelle Reti e nei Sistemi T.R.S. S.p.A.
>> Integration Test Engineer
>> Tel.  + 39 06.87281.407
>> Fax.  + 39 06.87281.550
>> E-mail: marco.malziotti at trs.it
>>
>>
>> Tecnologie nelle Reti e nei Sistemi T.R.S. SpA
>> Via della Bufalotta, 378 - 00139 Roma
>> Tel +39.06.87.28.1.1 - Fax +39.06.87.28.1.550
>>
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Tecnologie nelle Reti e nei Sistemi T.R.S. SpA
Via della Bufalotta, 378 - 00139 Roma
Tel +39.06.87.28.1.1 - Fax +39.06.87.28.1.550

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Ai sensi del D.Lgs. 196/2003 si precisa che le informazioni contenute in questo messaggio 
sono riservate ed a uso esclusivo del destinatario. Qualora il messaggio in parola Le 
fosse pervenuto per errore, la preghiamo di eliminarlo senza copiarlo e di non inoltrarlo 
a terzi, dandocene gentilmente comunicazione. Grazie.
This message, for the law 196/2003, may contain confidential and/or privileged information.
If you are not the addressee or authorized to receive this for the addressee, you must not 
use, copy, disclose or take any action based on this message or any information herein. 
If you have received this message in error, please advise the sender immediately by reply 
e-mail and delete this message. Thank you for your cooperation.

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This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.