The fiddle for Drools
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Drools Fiddle


Drools Fiddle is the fiddle for Drools, a business rule engine maintained by Redhat: The goal of this web tool is to allow technical or non technical users to play around with Drools. First, it allows you to build your business configuration by defining both fact models and business rules. Secondly, you can simulate the evaluation of your rule package by dynamically instanciating facts in the Drools working memory and trigger the fireAllRules method. A set of features have been implemented in order to enhance the user experience: step by step debugging, contribution, graphical visualization.

Table of Contents


This project uses Jboss WildFly as Application Server.


In order to build and deploy this project you will need to fullfill those prerequisites:


mvn clean install

Run integration tests

mvn clean verify -Parq-wildfly-managed


Build & Deploy

mvn clean install -Pdocker

Stop containers

mvn docker:stop -Pdocker

Getting Started

  1. Connect to The DRL editor is already filled with an HelloWorld package:
declare Fact
    value : int

rule "Rule"
    f : Fact(value == 42)
    modify( f ) {setValue( 41 )}
  1. Click on the Build in order to trigger the compilation and build of the rule package.
  2. Insert an instance of Fact with 42 as a value and then Submit.
  3. Click on Fire in order to trigger the fireAllRules method and evaluate your ruleset.


  1. Fork it!
  2. Create your feature branch: git checkout -b my-new-feature
  3. Commit your changes: git commit -am 'Add some feature'
  4. Push to the branch: git push origin my-new-feature
  5. Submit a pull request.


Core team

  • Julien Vipret : julien.vipret [at] gmail [dot] com
  • Matteo Casalino : matteo.casalino [at] gmail [dot] com


  • Alexis OLIVARI : olivari.alexis0 [at] gmail [dot] com
  • Thomas Palandri
  • Jaona Ramahaleo


Copyright 2016 Drools Fiddle

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.