1:59 a.m.
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: Mark Proctor
From: rules-users-bounces(a)lists.jboss.org on behalf of Edson Tirelli [tirelli(a)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(a)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@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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