Master Drools programming – from Beginner to Intermediate


Master Drools programming - from Beginner to IntermediateMaster Drools programming – from Beginner to Intermediate

What you’ll learn

  • program rules in Drools 7 domain specific language
  • detect problems and patterns in software development that are good to be solved with a rule engine like Drools
  • decouple complex decision trees into individual simple to understand rules
  • Drools language constructs like insert, modify, exists, forall, insertLogical, salience, agenda-group etc


  • You should have basic understanding of Java programming


We learn Drools DSL (Drools programming language) and go over the most common DSL constructs. We move in small steps and gradually introduce new consepts so it is easier to follow even for a beginner.

This way we cover the most common Drools topics like:

  • what is a rule engine
  • what is a difference between a method and a rule
  • why one would use a rule engine instead of writing regular Java code
  • understanding of the when/then clauses
  • understanding in which order the rules fire and when the order is not known
  • how to control the execution using activation-groups, agenda-groups and salience
  • declaring variables in DRL
  • difference between stateless and stateful sessions
  • inserting facts and modifying existing objects in the session
  • cross products (similar to SQL join)
  • exists, forall and collect

This course comes with a Java project that has all the code we look throughout this course. You are encouraged to check out and run the code yourself to get better understanding and experiment yourself with making changes to it. There are instructions how to get the code running in IntelliJ, Eclipse and VS Code.

After completing this course you have a better understanding of which kind of problems could be solved with Drools and how to write most common business rules in Drools DSL.

Who this course is for:

  • Developers and system architects who need to understand what a rule engine is and which type of problems can be solved with it
  • Anyone who needs to write rules in Drools DSL programming language
  • Developers and system architects needing more info about adding Drools rule engine to their project

Created by Juhan Aasaru
Last updated 10/2022
English [Auto]

Size : 1.63 GB

Download Now

Leave A Reply

Your email address will not be published.