Java and Microservices: From Monolith to Cloud Solutions

The book "Java and Microservices" is a practical guide for developers who want to master a modern approach to building distributed systems. Unlike many theoretical publications, this book offers a step-by-step path from analyzing the problems of monolithic architecture to creating a full-fledged microservice application ready for the cloud.

What is this book about?

The author consistently covers all stages of the microservice system lifecycle:

• Architecture Fundamentals: principles of monolith decomposition, context boundaries, decomposition strategies.
• Spring Boot and Spring Cloud: creating RESTful services, working with configuration, service registration (Eureka) and load balancing (Ribbon).
• Inter-Service Communication: synchronous (Feign, RestTemplate) and asynchronous (RabbitMQ, Kafka) protocols, error handling and timeouts (Hystrix, Resilience4j).
• Containerization and Orchestration: packaging services into Docker containers, writing Dockerfile and docker-compose, deploying to Kubernetes (Deployment, Service, ConfigMap).
• Monitoring and Logging: centralized log collection (ELK Stack), metrics (Prometheus + Grafana), distributed tracing (Jaeger).
• Security: authentication and authorization with JWT, OAuth2 and Spring Security.
• Testing: integration tests, contract testing (Spring Cloud Contract), test containers (Testcontainers).

Who is this book for?

The book will be useful for:

• Java developers with 1+ year of experience who want to transition from monolithic applications to microservices.
• Team Leads and architects looking for proven patterns and anti-patterns for distributed systems.
• Students and interns wanting to learn in-demand technologies (Spring, Docker, Kubernetes) through real-world examples.
• Backend developers in other languages who want to get acquainted with the Java ecosystem for microservices.

What will you learn after reading?

• How to properly decompose business logic into independent services.
• How to set up a CI/CD pipeline for automatic build and deployment.
• How to ensure fault tolerance and scaling (Circuit Breaker, Retry, Bulkhead).
• How to avoid common mistakes: distributed monolith, incorrect transaction handling, the "network hell" problem.
• How to migrate an existing monolith to a microservice architecture without stopping production.

All code examples are available on GitHub and are written in current versions of Java (17+) and Spring Boot 3.x. The book is suitable both for self-study and for corporate team training.