Introduction While learning event-driven architecture, I reached a pattern that sounds heavy but is built on a very simple idea: CQRS. Before the Outbox pattern and CDC made sense to me, I had to unde
System Design Series, Part 2. In Part 1 we covered API design: REST, idempotency, versioning, pagination and status codes. This part covers what sits in front of your services and how they survive fai
Introduction Good API design comes down to one idea: your system should behave predictably even when the network does not. Requests get lost, clients retry, and old apps keep calling endpoints you hav
An interface in Java is a blueprint of a class that defines a set of abstract methods, constants, and (since Java 8) default and static methods. It serves as a contract, specifying behaviors that implementing classes must provide. Interfaces are decl...
Object-oriented programming (OOP) is a powerful programming paradigm that organizes code around objects—entities that combine data (attributes) and behavior (methods). At the heart of OOP in Java are three fundamental concepts: inheritance, polymorph...
Welcome back to our Spring Boot learning journey! In Day 1, we set up a Spring Boot project using Spring Initializr and created basic endpoints using @Controller without leveraging @RestController. Today, we’ll enhance our application by introducing ...
Elasticsearch, a distributed search and analytics engine built on Apache Lucene, is renowned for its speed and flexibility in handling complex search and filtering tasks. When paired with Spring Boot, a robust Java framework for building scalable bac...