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This README is available in another language:
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Java Projects

Overview

This folder contains Java projects demonstrating various architectural approaches, working with databases, REST API implementation, and microservices.
Each project illustrates the evolution of architecture: from a console application with a layered structure to full-fledged web and microservice solutions with security and integration.

Projects

1. ATM System

  • Purpose: Practice with Java, Maven, JavaDoc, and JUnit.
  • Description: Simulates ATM operations with account creation, transactions, history, and error handling via checked exceptions.
  • Architecture: Layered structure (domain, service, repository, main).

2. Database Application (JPA / Hibernate)

  • Added:
    • DAO layer and ORM integration (JPA/Hibernate).
    • Bidirectional entity relationships and business logic in services.
  • Description: Models a system for tracking pets and owners with CRUD operations, relationships, and tests.

3. Web Application for Managing Cats and Owners (Spring Boot + REST API)

  • Added:
    • Web layer with Spring Boot and Spring MVC.
    • REST API, pagination, filtering, DTO layer.
    • Documentation via Swagger.
  • Description: Web service for managing cats and owners with modern web technologies.

4. Web Application with Security (Spring Boot + REST API + Security)

  • Added:
    • Security layer (Spring Security, authentication, authorization, roles).
    • User and session management.
    • Single entry point and access control.
  • Description: Web application with REST API, DTO, security, and controller tests.

5. Microservice Application (Spring Boot + REST API + RabbitMQ + Security)

  • Added:
    • Microservice architecture: separate services for cats, owners, and gateway.
    • Interaction via RabbitMQ.
    • JWT authentication, routing, data isolation.
  • Description: Microservice solution with REST API, security, integration, and tests.

Common Technologies

  • Java 21
  • Maven
  • JavaDoc — documentation (for console and server projects)
  • Swagger — API documentation

Summary

This folder contains projects demonstrating the evolution of architecture and technologies in Java: from simple console solutions to modern microservice systems.
Each project is autonomous, extensible, well-tested, and illustrates specific architectural and technological approaches.