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Questions tagged [drools]

Drools is a business-rule management system (BRMS) with a forward-chaining-inference-based rules engine, more correctly known as a production rule system, using an enhanced implementation of the Rete algorithm.

https://www.drools.org/

Drools is a Business Rules Management System (BRMS) solution. It provides a core Business Rules Engine (BRE), a web authoring and rules management application (Drools Workbench), full runtime support for Decision Model and Notation (DMN) models at Conformance level 3 and an Eclipse IDE plugin for core development.

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Multi-accumulate in Drools

I have a scenario where i need to accumulate two different sets from the same input: accumulate (ord : Order(type == A); $aSet : collectSet(ord)) accumulate (ord : Order(type == B); $bSet : collectSet(ord)) Is there a way to accomplish it with only…
supermax2015
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Drools compare two objects in decision table

I have the following code in DRL file rule "MyExample" when $eentity : ExampleEntity() $sentity : SecondEntity( secondField == $eentity.getMainField()) then System.out.println(true); end This is works but I need to convert it to…
Squeez
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In Drools, can a selection clause (using keyword `from`) be written over an Iterable or Iterator?

Given a Java interface like this: class Hobby { public String getName() {...} } class Person { public Iterable getHobbies() {...} } How can I, in a LHS expression, select Hobby objects with a specific name. For example, something…
E-Riz
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Storing large reference data objects in Drools

I'm looking for a way to store large objects within Drools for long periods of time (i.e. not like facts which are added and removed from within a session). I've read that Drools works using KnowledgeBases and Sessions (Stateless & Stateful) and…
GroomedGorilla
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Facing "unqualified type in strict mode for: MessageExchangePattern" while trying to integrate Mule with Drools

i am trying to integrate mule with drools, i have mainly followed the tutorial here but i am getting this error : (1,22) unqualified type in strict mode for: MessageExchangePattern (1,30) unqualified type in strict mode for: ONE_WAY ' it seems…
MoienGK
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What does "The prefix "vm" for element "vm:endpoint" is not bound." means and how to solve it?

I am trying to integrate mule with drools, I have mainly followed the tutorial here but I am getting this error : "The prefix "vm" for element "vm:endpoint" is not bound." can anyone help me solve this problem? following is my .drl file and mule…
MoienGK
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drools.getRule().getName() in attributes -rule drool file

I need to enable / disable certain rules from drl file based on data from the backend . i.e enable Rule 1,2,3 for Dubai , Enable 1,3 for Singapore So , I pass drools.getRule().getName() as below. rule "Apply 50% discount to VIP customers" …
Hardik Amlani
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Drools workbench test scenarios

Two part question: I need to setup test case where one bean/fact has collection of items - is it possible to do with workbench editor, I picked Guided list and for each item I was trying to do new Item('sku', 'name') .. but when it tries to…
vladsfl
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How to join two query in drools rule language

I have two queries used to find specific items, they are as follows: query "score" (double s) Item( score > s ) end query "price" (double p) Item( price < p ) end The following query is used to find items score > s or price < p: query…
moshangcheng
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Drools: using the same DSL definition twice with a variable throws a duplicate variable error

If you define a DSL file with some lines, and one of them uses a variable, you cannot use it twice in a rule because you will get a duplicate variable error. What's the best way to avoid this? Ideally I would like to avoid to create two copies of…
Francesco
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How to avoid loops in Drools without using NO-LOOP attribute?

Is there any possible way to avoid looping without using NO-LOOP attribute of Drools(Like I have heard we can achieve this by using the not(!) operator on objects but am unable to find out.) The problem is NO-LOOP attribute can't be used(as that is…
Hitesh Garg
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Drools, KIEBASE serialisation

I'm working with drools 6.0.1.Final using maven to create an android app. To reduce the workload of the mobile i've decided to compile the rules on my destop/server and then package the compiled rules in the mobile app. My problem is that i'm unable…
Cyrille Mortier
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Drools marshall/unmarshall not save global

I have a Test to unmarshall kiesession, with data in Global, but the unmarshall not return global. The code is that : Java Test KieServices kieServices = KieServices.Factory.get(); KieContainer kContainer =…
iflores
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Optaplanner newbie: nurse softconstraint for weekends

I'm studying Optaplanner, and am doing some experiments with the Nursing Roster. My goal, for this experiment, is simple: to have nurse "1" be more in favor, and more likely, to work weekends. I have written the following rules to help make this…
Magick
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Drools exception in new version of Grails

First of all I am referring to this question (LINK) which did not help me because then versions of frameworks were lower so I am starting new question. So I am using Grails 2.4.3 framework and trying to use Drools rule engine inside it. Java version…
Ivan Longin
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