[jboss-jira] [JBoss JIRA] Updated: (JBRULES-1089) Getting "could not access property ('=')" for a valid rule.
Mark Proctor (JIRA)
jira-events at lists.jboss.org
Mon Aug 20 20:50:18 EDT 2007
[ http://jira.jboss.com/jira/browse/JBRULES-1089?page=all ]
Mark Proctor updated JBRULES-1089:
----------------------------------
Fix Version/s: 4.0.1
Assignee: Edson Tirelli (was: Mark Proctor)
> Getting "could not access property ('=')" for a valid rule.
> -----------------------------------------------------------
>
> Key: JBRULES-1089
> URL: http://jira.jboss.com/jira/browse/JBRULES-1089
> Project: JBoss Rules
> Issue Type: Bug
> Security Level: Public(Everyone can see)
> Components: Drl Parser/Builder
> Affects Versions: 4.0.0.GA
> Environment: WinXP, Java 1.6.0 (Sun), running within Eclipse 3.2.2
> Reporter: Arsalan Zaidi
> Assigned To: Edson Tirelli
> Fix For: 4.0.1
>
>
> From: rules-users-bounces at lists.jboss.org on behalf of Edson Tirelli [tirelli at post.com]
> Sent: 13 August 2007 22:16
> To: Rules Users List
> Subject: Re: [rules-users] could not access property ('=')
> Attachments: ATT426765.txt
> This looks like an MVEL issue, since your expression is being converted into an MVEL predicate. May I ask you please to open a JIRA for that bug?
> Meanwhile, a workaround that shall work for you and may give you improved perf is to split your pattern into 2 patterns using the from keyword:
> when
> $dto : DTO( )
> W250_4_1( value in ("0" ,"1" ,"6" ,"7" ,"A" ,"C" ,"D" ,"G" ,"L" ,"M" ,"P" ,"Q" ,"S" ,"V" ,"Z" ) ) from $dto.w250_4_1
> then
> Thanks, and hope it helps.
> Edson
> 2007/8/13, Arsalan S. Zaidi < arsalan.zaidi at capgemini.com>:
> Hi.
> I've currently evaluating Drools 4.0 for a project of ours and I'm running into some problems.
> I have a rule which looks like this:
> rule "W250.42 Editable"
> when
> DTO(w250_4_1.value in ("0" ,"1" ,"6" ,"7" ,"A" ,"C" ,"D" ,"G" ,"L" ,"M" ,"P" ,"Q" ,"S" ,"V" ,"Z" ) )
> then
> System.out.println ("0" );
> Action action = createAction("W250.42" , false , true );
> retList.add(action);
> end
> both DTO and w250_4_1 are extremely simple beans. w250_4_1 just has 1 property 'value' which is a String and DTO has one property w250_4_1 which is the bean w250_4_1 .
> Now when I put "0" into w250_4_1 then everything works fine. The rule is true and the 'then' portion is executed. However, if I set w250_4_1 to "6" (which is also present in the in (...)) then I get the following error.
> org.drools.RuntimeDroolsException : Exception executing predicate org.drools.base.mvel.MVELPredicateExpression at 118fa47
> at org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:197 )
> at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:122 )
> at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:317 )
> at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:168 )
> at org.drools.reteoo.Rete.assertObject(Rete.java:168 )
> at org.drools.reteoo.ReteooRuleBase.assertObject( ReteooRuleBase.java:190)
> at org.drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java:70 )
> at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:848 )
> at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:822 )
> at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:623 )
> at com.sample.DroolsTest.main( DroolsTest.java:34)
> Caused by: org.mvel.PropertyAccessException: failed to access property: <<==>> in: class com.sample.DTOShadowProxy
> at org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:137 )
> at org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:96 )
> at org.mvel.ASTNode.getReducedValueAccelerated(ASTNode.java:194 )
> at org.mvel.ast.Or.getReducedValueAccelerated(Or.java:18 )
> at org.mvel.MVELRuntime.execute( MVELRuntime.java:87)
> at org.mvel.CompiledExpression.getValue( CompiledExpression.java:98)
> at org.mvel.MVEL.executeExpression( MVEL.java:202)
> at org.drools.base.mvel.MVELPredicateExpression.evaluate(MVELPredicateExpression.java:36 )
> at org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:191 )
> ... 10 more
> Caused by: org.mvel.PropertyAccessException: could not access property ('=')
> at org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.getBeanProperty(ReflectiveAccessorOptimizer.java:252 )
> at org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:106 )
> ... 18 more
> If I keep w250_4_1 as "0", but move "0" in the rule to any other place place in the in() list (e.g. in ("1","0",...), then I get a similar error.
> I get similar errors when trying to use 'not in' in the same circumstance, except that then the property is ('!')
> What seems to be the issue?
> Thanks in advance!
> Regards,
> --Arsalan
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> --
> 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
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