Implement your own Rule-Engine in Spring Boot

Rule-Engine is an expert-system program, which runs the rules on the input data and if any condition matches then it executes the corresponding actions.

In software development, there are often situations where we need to apply a set of rules or conditions to filter and process data. Managing these rules using traditional if and else conditions can become cumbersome and difficult to maintain.
A rule engine provides a more flexible and organized approach to define and execute these rules.
In this article, we will explore how to build a simple rule engine in Spring Boot project using Java functional programming principles.

RuleEngine :
The rule engine is responsible for managing a collection of rules and applying them to a set of objects. It filters the objects based on the defined rules and returns the filtered results.

Let’s start to create our own rule engine step by step:

First, we will create one simple spring boot application using https://start.spring.io/

In this application, first I will create an UserController.java class and will create one rest endpoint that will return list of User.

package com.example.spring_boot_rule_engine_demo.controller;

import…