Spring Boot Beginner's Guide: Build a Fault-Tolerant REST API with Resilience4j
This guide walks you through setting up a Spring Boot application with a Resilience4j Circuit Breaker , ensuring fault tolerance. You will learn how to create a REST API, configure circuit breaker settings, write unit tests, and package the application for deployment. By the end of this guide, you'll have a fully functional Spring Boot project that can handle failures gracefully and be easily extended for production use. 1. Prerequisites Make sure you have the following installed: Java 17 or later Maven (Apache Maven 3.6+) An IDE (e.g., IntelliJ IDEA, Eclipse, or VS Code) 2. Project Setup Create a Maven Project You can set up a Maven project manually or by using Spring Initializr. Here, we’ll create the project manually. Project Structure spring-boot-demo/ ├── src/ │ ├── main/ │ │ ├── java/ │ │ │ └── com/ │ │ │ └── example/ │ │ │ └── demo/ │ │ │ ├── DemoApplication.java │ │ │ └── controller/ │ │ │ ...