[rules-users] could not access property ('=')

[Arsalan S. Zaidi]

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:1
97)

      at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:122)

      at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(Compo
siteObjectSinkAdapter.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.jav
a:848)

      at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.jav
a:822)

      at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.jav
a: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.compileGetChai
n(ReflectiveAccessorOptimizer.java:137)

      at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccess
or(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(MVELPredicateExpre
ssion.java:36)

      at
org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:1
91)

      ... 10 more

Caused by: org.mvel.PropertyAccessException: could not access property
('=')

      at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.getBeanPropert
y(ReflectiveAccessorOptimizer.java:252)

      at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChai
n(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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