Re: [rules-users] Accumulate in Drools

Thanks Edson. I don't why but when i am using the below rule in my drl it's failing to compile. Not sure if i am doing something stupid or this is an issue with environment or the drl. I am attaching the drl file with the mail. The error that i get is : - testTestsRulesEngine( *suitability.TestsRulesEngineTest)suitability.RulesEngineException*: Could not load/compile rules file: testAccumulate.drl at suitability.RulesEngine.<init>( *RulesEngine.java:39*) at suitability.TestsRulesEngine.<init>( *TestsRulesEngine.java:13*) at suitability.TestsRulesEngineTest.setUp( *TestsRulesEngineTest.java:72*) Caused by: *java.lang.NullPointerException* at org.drools.common.AbstractRuleBase.addPackages( *AbstractRuleBase.java:434*) at org.drools.reteoo.ReteooRuleBase.addPackage( *ReteooRuleBase.java:388*) at suitability.RulesEngine.<init>( *RulesEngine.java:36*) ... 14 more Regards, Manav ------------------------------ *From:* Edson Tirelli <tirelli(a)post.com&gt; *To:* Manav <manav7574(a)yahoo.com>; Rules Users List < rules-users(a)lists.jboss.org&gt; *Sent:* Mon, August 16, 2010 7:46:54 PM *Subject:* Re: [rules-users] Accumulate in Drools You can't use the cast and the method call in a regular constraint. You can use it as part of an expression. So: $min_score : Number () from accumulate (Client (productTypeExperience.keySet contains $name, $score : productTypeExperience[$name], min ( ((ExperienceLevel)$score).value() ) ) We are working on the support of free form expressions on constraints for Drools 6 (not sure we can make it for 5.2). Edson 2010/8/15 Manav <manav7574(a)yahoo.com&gt; > Hi, > I am trying my hand at the accumulate function in Drools 5.x but the drl > fails > to compile. > Not sure what's wrong with it. Please help. > This is the sample that i am working with > > rule "Test Accumulate Function" > when > $p : ProductType ($name : name) > $min_score : Number () > from accumulate (Client (productTypeExperience.keySet contains $name, > $score : > ((ExperienceLevel)productTypeExperience[$name]).value()), > min ($score)) > then > System.out.println ("$min_score" + $min_score); > end > Regards, > Manav > > > > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > -- Edson Tirelli JBoss Drools Core Development JBoss by Red Hat @ www.jboss.com