[rules-users] first steps with drools.....first errors
Edson Tirelli
tirelli at post.com
Tue Sep 16 10:01:15 EDT 2008
You syntax is wrong. Fixing your syntax is as easy as saying:
exists ExamDetail( authLimit != null )
But I think that your rules can be simplified by simply writing:
rule "Rule n.1"
dialect "mvel"
no-loop true
salience 10
when
$examDetail : ExamDetail( $value: value < authLimit);
then
System.out.println( "1 Exam passed!" + $value);
end
rule "Rule n.2"
dialect "mvel"
no-loop true
salience 10
when
not ExamDetail( value < authLimit );
then
System.out.println( "2 Exam passed! + $value);
end
This should cover both of your scenarios.
[]s
Edson
2008/9/12 Nicola Benaglia <nicola.benaglia at tecno-progetti.eu>
> Hi,
> I am moving my first steps with Drools 4.0.7.
>
> In my case I have an exam result to valuate.
> I can pass an ExamDetailas fact containing (value, authLimit, lawLimit)
> where authLimit may or may not be present.
>
> How can I force to valuate a rule only if a property exists?
>
> Here an example:
>
> rule "Rule n.1"
> dialect "mvel"
> no-loop true
> salience 10
> when
> exists ExamDetail(authLimit);
> $examDetail : ExamDetail( $value: value < authLimit);
> then
> System.out.println( "1 Exam passed!" + $value);
> end
>
> rule "Rule n.2"
> dialect "mvel"
> no-loop true
> salience 10
> when
> not exists ExamDetail(authLimit);
> ExamDetail( $value: value < lawLimit);
> then
> System.out.println( "2 Exam passed! + $value);
> end
>
>
> With these 2 rules I expected to cover my 2 cases:
> 1) When I have authLimit --> rule #1
> 2) When authLimit is absent --> rule #2
>
> But I get this error (when I don't have authlimit):
>
> Exception in thread "main" org.drools.rule.InvalidRulePackage: [14,21]:
> unknown:14:21 Unexpected token 'authLimit'[25,6]: unknown:25:6
> Unexpected token 'exists'[25,24]: unknown:25:24 Unexpected token
> 'authLimit'
> at org.drools.rule.Package.checkValidity(Package.java:424)
> at
> org.drools.common.AbstractRuleBase.addPackage(AbstractRuleBase.java:394)
> at eu.tecnoprogetti.rules.seam.ExamCheck.main(ExamCheck.java:23)
>
>
> Any suggestions?
> Thank you for your time.
> Nico
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>
--
Edson Tirelli
JBoss Drools Core Development
JBoss, a division of Red Hat @ www.jboss.com
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