Java Backend Project 2

This is my second backend project using Java, focused on deepening core concepts like TDD (Test-Driven Development), Generics, and Unit Testing with a structured and modular approach.
It follows the same CRUD foundation as the first project, but this time with a strong emphasis on writing tests first and applying best development practices.

🔗 Want to have a look at the first project? Check out Project 1 - Java CRUD Example, it’s the starting point of my Java journey.

📌 Features

• Application of the TDD methodology: tests are created before implementation;
• Usage of Generics for both DAO and Service layers to reduce code repetition;
• Custom domain models like Client and Product implementing a Persistable interface;
• GenericMapDAO and GenericService for reusable CRUD operations across entities;
• Unit tests using JUnit 5, structured for DAO and Service layers with mock implementations for isolation;
• Dependency injection used to wire DAOs into services in the test setup;
• Detailed Javadoc comments across classes and test files;

🗂️ Project Structure

• br.com.eaugusto.domain: Domain models like Client and Product, and the Persistable interface;
• br.com.eaugusto.dao: DAO interfaces and implementations, including ClientDAO and ProductDAO;
• br.com.eaugusto.dao.generics: Generic DAO interfaces and base implementations using Map storage;
• br.com.eaugusto.services: Service interfaces and classes, such as ClientService and ProductService;
• br.com.eaugusto.services.generics: Generic service interfaces and implementations using the generic DAO layer;
• br.com.eaugusto (test): Contains test classes for DAO and service layers using mock implementations and dependency injection;

🧪 Testing Approach

• Follows the test-first approach with JUnit 5;
• Includes coverage for CRUD operations on both service and DAO layers;
• Mock classes like ClientDAOMock and ProductDAOMock simulate data access for isolated tests;
• Each test class includes setup logic, method verification, and meaningful assertions;
• Coverage tools like EclEmma are being used for visual feedback during development.

📅 Commit Highlights

June 25, 2025

• Added Javadoc to ProductServiceTest for clarity and documentation;
• Completed ProductService and its test class, following the TDD pattern;
• Updated Product to use a default constructor and setter-based initialization in tests.

June 24, 2025

• Created Product entity and DAO with full test coverage using ProductDAOMock and ProductDAOTest;
• Applied generic DAO structure to both Client and Product workflows.

June 23, 2025

• Implemented delete and modify actions in DAO and service layers with respective tests.

June 22, 2025

• Initial project setup with domain models, DAO, and service layers for Client;
• Set up TDD structure and created first unit tests.

📚 Learning Goals

• Practice TDD effectively in a real-world-style CRUD application;
• Use generics to build flexible, reusable service and DAO layers;
• Write clean, modular tests that simulate business logic and edge cases;
• Understand the integration of Swing (coming soon) into backend-driven Java apps.