Spring Boot Microservices Development

We will build a BookStore Application using Spring Boot, Spring Cloud, and Docker.

BookStore Microservices Architecture

Modules

• catalog-service: This services provides REST API for managing catalog of products(books).

  TechStack: Spring Boot, Spring Data JPA, PostgreSQL

• order-service: This service provides the REST API for managing orders and publishes order events to the message broker.

  TechStack: Spring Boot, Spring Rest API's, Spring Security OAuth2, Keycloak, Spring Data JPA, PostgreSQL, RabbitMQ

• notification-service: This service listens to the order events and sends notifications to the users.

  TechStack: Spring Boot, RabbitMQ

• api-gateway: This service is an API Gateway to the internal backend services (catalog-service, order-service).

  TechStack: Spring Boot, Spring Cloud Gateway

• bookstore-webapp: This is the customer facing web application where customers can browse the catalog, place orders, and view their order details.

  TechStack: Spring Boot, Spring Security OAuth2, Keycloak, Thymeleaf, Alpine.js, Bootstrap

Learning Objectives

• Building Spring Boot REST APIs
• Database Persistence using Spring Data JPA, PostgreSQL, Flyway
• Event Driven Async Communication using RabbitMQ
• Implementing OAuth2-based Security using Spring Security and Keycloak
• Implementing API Gateway using Spring Cloud Gateway
• Implementing Resiliency using Resilience4j
• Job Scheduling with ShedLock-based distributed Locking
• Using RestClient, Declarative HTTP Interfaces to invoke other APIs
• Creating Aggregated Swagger Documentation at API Gateway
• Local Development Setup using Docker, Docker Compose and Testcontainers
• Testing using JUnit 5, RestAssured, Testcontainers, Awaitility, WireMock
• Building Web Application using Thymeleaf, Alpine.js, Bootstrap
• Monitoring & Observability using Grafana, Prometheus, Loki, Tempo
• Kubernetes Basics
• Deployment to Kubernetes
• Local Development Setup
• Install Java 21. Recommend using SDKMAN for managing Java versions.
• Install Docker Desktop
• Install IntelliJ IDEA or any of your favorite IDE
• Install Postman or any REST Client
• Other Learning Resources