[rules-users] Unable to resolve token on function call with mvel dialect

[Edson Tirelli]

     Can you plz show us the DRL instead of the DSLR for your rule? use the
DRLViewer tab for that...

2008/12/15 Olivier THIERRY <olivier.thierry at gmail.com>

> Hi,
>
> I use drools 4.0.7 and I encounter a problem calling a function from a
> rule written for mvel dialect.
>
> The function I need to call has this signature :
>
> function VOCounter createCounter(org.drools.spi.KnowledgeHelper
> drools, String code, Number number)
>
> When I call this function, I want to assign result to a variable, for
> example to insert it to working memory later, or just to use it in
> another function call.
> So I wrote something like that (I am writing a DSL so part of the code is
> DSL ):
>
> rule "CALCUL_RELICAT_CP"
>        salience 8
>        no-loop
>        when
>                not There is a counter called "RELICAT_CP"
>                There is a date called "startDate"
>                There is a date called "endDate"
>                There is a counter called "SOLDE_CP_CUM" with
>                        - start date is last year
>        then
> >               VOCounter $relicat =
> createCounter(drools,"RELICAT_CP",$SOLDE_CP_CUM.value);
> >               insert($relicat);
>                Copy counter $SOLDE_CP_CUM to SOLDE_RELICAT_CP
> end
>
> But I have the following stack trace :
>
> org.drools.spi.ConsequenceException:
> org.mvel.UnresolveablePropertyException: unable to resolve token:
> createCounter(drools,"RELICAT_CP",$SOLDE_CP_CUM.value)
>        at
> org.drools.base.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:13)
>        at
> org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:558)
>        at
> org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:518)
>        at
> org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:475)
>        at
> org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:439)
>        at
> fr.horoquartz.t4.test.drools.TestRuleBase.executeRuleWithDsl(TestRuleBase.java:120)
>        at fr.horoquartz.t4.test.drools.Test1.testDsl(Test1.java:39)
> Caused by: org.mvel.UnresolveablePropertyException: unable to resolve
> token: createCounter(drools,"RELICAT_CP",$SOLDE_CP_CUM.value)
>        at
> org.mvel.ast.PropertyASTNode.initializePropertyNode(PropertyASTNode.java:129)
>        at
> org.mvel.ast.PropertyASTNode.getReducedValueAccelerated(PropertyASTNode.java:24)
>        at org.mvel.ExecutableAccessor.getValue(ExecutableAccessor.java:45)
>        at
> org.mvel.ast.TypedVarNode.getReducedValueAccelerated(TypedVarNode.java:43)
>        at org.mvel.MVELRuntime.execute(MVELRuntime.java:90)
>        at org.mvel.CompiledExpression.getValue(CompiledExpression.java:111)
>        at org.mvel.MVEL.executeExpression(MVEL.java:235)
>        at
> org.drools.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:48)
>        at
> org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:554)
>        ... 34 more
>
> What is strange is that it works if I don't assign function call
> result to a variable. For example the following works  :
>
> insert (createCounter(drools,"RELICAT_CP",$SOLDE_CP_CUM.value));
>
> It also works if I assign $SOLDE_CP_CUM.value to a temporary variable
> and use it for function call :
>
> Number $val = $SOLDE_CP_CUM.value;
> VOCounter $relicat = createCounter(drools,"RELICAT_CP",$val);
> insert($relicat);
>
> I had not this problem using java dialect. I understand nothing in
> what happens ... Anyone has an idea what the problem is ?
>
> Thanks in advance,
>
> Olivier
> _______________________________________________
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> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>



-- 
 Edson Tirelli
 JBoss Drools Core Development
 JBoss, a division of Red Hat @ www.jboss.com
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