[rules-users] Unable to resolve token on function call with mvel dialect
Edson Tirelli
tirelli at post.com
Mon Dec 15 12:58:07 EST 2008
Looks like a bug. I will talk to mvel author.
[]s
Edson
2008/12/15 Olivier THIERRY <olivier.thierry at gmail.com>
> Well ... I found something very strange with Drools and mvel dialect
> ... It looks like Drools doesn't like points in function parameters !
>
> I made this very simple test with a log function and the easier rule
> you can have :
>
> function void log (String message) {
> System.out.println(message);
> }
>
> rule "test"
> no-loop
> when
> eval(true)
> then
> log("hello world")
> end
>
> log("hello world") works ok
> log("hello.world") (note the point) fails with this stack trace :
>
> org.drools.spi.ConsequenceException:
> org.mvel.UnresolveablePropertyException: unable to resolve token:
> log("hello.world")
> 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 t4.test.drools.TestRuleBase.executeRule(TestRuleBase.java:44)
> at t4.test.drools.Test1.testDebug(Test1.java:57)
> Caused by: org.mvel.UnresolveablePropertyException: unable to resolve
> token: log("hello.world")
> at
> org.mvel.ast.PropertyASTNode.initializePropertyNode(PropertyASTNode.java:129)
> at
> org.mvel.ast.PropertyASTNode.getReducedValueAccelerated(PropertyASTNode.java:24)
> 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
>
> It looks like there is a problem with point character, doesn't it ? Is
> it a known problem ?
>
> Regards,
>
> Olivier
>
>
> 2008/12/15 Olivier THIERRY <olivier.thierry at gmail.com>:
> > Thanks Edson. Here it is :
> >
> > rule "CALCUL_RELICAT_CP"
> > salience 8
> > no-loop
> > when
> > not $RELICAT_CP : VOCounter (code=="RELICAT_CP")
> > $startDate : RuleDate(name=="startDate")
> > $endDate : RuleDate(name=="endDate")
> > $SOLDE_CP_CUM : VOCounter ( code=="SOLDE_CP_CUM",
> > startDate.year == ($startDate.year - 1) )
> > then
> > VOCounter $relicat =
> createCounter(drools,"RELICAT_CP",$SOLDE_CP_CUM.value);
> > insert($relicat);
> >
> insert(createCounter(drools,"SOLDE_RELICAT_CP",$SOLDE_CP_CUM.value));
> > end
> >
> > I thought about trying with a newer version of mvel, but it doesn't
> > look so easy to upgrade it :(
> >
> > 2008/12/15 Edson Tirelli <tirelli at post.com>:
> >>
> >> 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
> >>> _______________________________________________
> >>> rules-users mailing list
> >>> 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
> >>
> >> _______________________________________________
> >> rules-users mailing list
> >> rules-users at lists.jboss.org
> >> https://lists.jboss.org/mailman/listinfo/rules-users
> >>
> >>
> >
> >
> >
> > --
> > Seules 2 choses sont infinies : l'univers et la bêtise humaine ; et
> > encore pour l'univers, je ne suis pas sûr … (Einstein)
> >
>
>
>
> --
> Seules 2 choses sont infinies : l'univers et la bêtise humaine ; et
> encore pour l'univers, je ne suis pas sûr … (Einstein)
>
> _______________________________________________
> rules-users mailing list
> 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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