Java Microservices Tutorial

Microservices is an architectural approach where an application is broken into small, independent services that communicate through APIs. Each service is developed and deployed separately using Spring Boot and Java’s strong ecosystem. This approach makes applications more scalable, reliable and easier to maintain.

Key Features of Microservices

Modular architecture: The application is broken down into a set of loosely coupled services
Language independent: Services can be written in different programming languages
Scalability: Individual services can be scaled independently based on demand
Resilience: Failure of one service does not impact others
Flexibility: Services can be modified, updated or replaced independently

1. Introduction to Java Microservices

Java Microservices break applications into small, independent services. Let’s explore what they are, why this architecture is popular and the role of stateful vs stateless services.

2. Java Microservices with Spring Boot

2.1. Basics

Let’s start with the basics of building Java Microservices using Spring Boot, with a step-by-step example and key reasons why Spring Boot is the top choice for development.

2.2. Service Registry & Discovery

In this section, we’ll explore Service Registry and Discovery in Java Microservices, focusing on Eureka for configuration, server-side and client-side discovery and enabling auto-scaling.

2.3. API Gateway

In this section, we cover API Gateway in Java Microservices. we’ll learn what an API Gateway is, how to build one using Spring Cloud Gateway and how it enables dynamic routing and service discovery. We’ll also look into key security best practices to safeguard your microservices.

2.4. Load Balancing

This section explores load balancing in Java Microservices. We’ll learn how Spring Boot supports load balancing, how to integrate Eureka, Feign and Spring Cloud Load Balancer and how Ribbon can be used to efficiently distribute traffic across services.

2.5. Communication Patterns

In this section, we cover different communication patterns in Java Microservices. We’ll explore synchronous methods like RestTemplate, FeignClient and WebClient, as well as asynchronous messaging with Kafka, ActiveMQ and RabbitMQ for reliable inter-service communication.

2.6. Circuit Breaker & Resilience

This section focuses on Circuit Breakers and resilience in Java Microservices. We’ll learn how to prevent cascading failures using Hystrix, explore resilience patterns like retries and understand how to build fault-tolerant microservices with Spring Boot.

2.7. Messagin & Event-Driven Architecture

This section introduces Messaging and Event-Driven Architecture in Java Microservices. We’ll explore how messaging queues enable asynchronous communication, understand event-driven design and learn to build scalable event-driven microservices using Apache Kafka.

2.8. Deployment

In this section, we’ll learn how to deploy Java Microservices effectively. From containerizing with Docker to orchestrating with Kubernetes and deploying on cloud platforms like AWS Elastic Beanstalk and ECS with Fargate, you’ll gain practical insights into scalable deployment strategies.

3. Secure Java Microservices

In this section, we focus on securing Java Microservices. We’ll explore essential security measures, session management, secure API communication and service registration with Eureka, along with best practices using Spring Security to protect microservices effectively.

4. Miscellaneous

In this section, we cover miscellaneous yet important aspects of Java Microservices such as REST API versioning, enabling real-time communication with WebSockets and handling cross-cutting concerns like logging, monitoring and configuration.