How to fix "Variables can not be used inside bindings" error in Drools ?

Solution Unverified - Updated -

Issue

  • When defining a new rule (like the following) in BRMS, it throws the latter given error message.

Rule:

package com.sample

import com.sample.Test;

rule "Test"
    when
           Test($firstVal : map.get("key"), $secondVal: map.get($firstVal))
    then
           System.out.println("Fired rule: Test");
    end

Stacktrace:

Variables can not be used inside bindings. Variable [$firstVal] is being used in binding 'map.get($firstVal)' : [Rule name='Test']

java.lang.IllegalArgumentException: Could not parse knowledge.
    at com.sample.Test.readKnowledgeBase(Test.java:41)
    at com.sample.Test.main(Test.java:22)
        ...

How to fix this rule?

Environment

  • Red Hat JBoss BRMS (BRMS)
    • 5.x

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase of over 48,000 articles and solutions.

Current Customers and Partners

Log in for full access

Log In
Close

Welcome! Check out the Getting Started with Red Hat page for quick tours and guides for common tasks.