Java Application Architecture: From Monolith to Microservices

This book is a practical guide to creating well-designed, scalable, and maintainable Java applications. It doesn't just list concepts but shows how to apply them in real projects, from a simple monolith to a complex microservice architecture.

Who is this book for?

• Java developers with 1+ years of experience who want to move to the architect level
• Team Leads striving to improve code structure in their team
• Senior students studying industrial Java development
• Developers from other languages transitioning to Java and wanting to understand its strengths

What will you learn from the book?

• Architecture fundamentals: SOLID, GRASP, principles of dependency inversion and separation of concerns
• Design patterns: when and how to apply GoF patterns in modern Java frameworks (Spring, Jakarta EE)
• Working with Spring Boot: proper bean organization, configuration, profiles, and aspect-oriented programming
• From monolith to microservices: decomposition strategies, API Gateway, Service Discovery, Circuit Breaker
• Architecture testing: unit tests, integration tests, contract testing (Pact), and performance testing
• Refactoring: how to safely change architecture without stopping business processes
• Security and scaling: caching, asynchrony, error handling, and monitoring

Why will this book be useful?

Each chapter contains real Java code examples, diagrams, and step-by-step instructions. You won't just read theory — you'll be able to apply it immediately in practice. The book is written in simple language, without excessive academic style, but with a deep understanding of the subject.

Special attention is given to the transition from monolithic architecture to microservices: the author shows typical mistakes and ways to avoid them. You will learn how to design applications that are easy to test, deploy, and maintain for years.

The book "Java Application Architecture" will become your desktop reference when designing new systems and refactoring existing ones.