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🛒 E-commerce System — Spring Boot Sample

This is an advanced, educational Spring Boot project modeling a simple e-commerce system. The intent is to showcase best practices in JPA, validation, REST design, and layer separation, all while packaging detailed commentary to accelerate understanding.

📁 Project Structure

src/
 └─ main/
     ├─ java/com/example/ecommercesystem/
     │    ├─ model/         ← Entities packed with exhaustive documentation
     │    ├─ repository/    ← Spring Data JPA interfaces with advanced usage
     │    ├─ service/       ← (TBD) Business logic with transactional orchestration
     │    └─ controller/    ← (TBD) REST layer with DTOs and validation
     └─ resources/
         └─ application.properties  ← DB config and server settings

🚀 Getting Started

Prerequisites

  • Java 8+ or OpenJDK 1.8 (recommended)
  • Maven 3.6+
  • A relational database (H2 in-memory default, or switch to PostgreSQL/MySQL) (or you can use the docker files)

Run the App

git clone https://github.com/yourorg/java-springboot.git
cd java-springboot
mvn clean spring-boot:run

The app starts on http://localhost:8080

🌟 Feature Highlights

✅ Entity Modeling

  • Product and Category use:

    • @NotBlank, @Size, @Future, @Email, etc.
    • Cascade types with warnings on dangerous usage
    • Fetch strategies (EAGER, LAZY) with N+1 explanation
    • Bidirectional relationships with serialization control (@JsonManagedReference, @JsonIgnore)

✅ Repository Layer

  • Derived query methods
  • JPQL with @Query
  • Pagination and sorting with Pageable
  • Safe parameter naming with @Param("customName")
  • Entity graph loading with @EntityGraph

📌 Upcoming Enhancements

☑️ To-Do Features

  • Service Layer: abstraction and transactional orchestration
  • DTOs: decoupled API models with validation
  • REST Controllers: endpoints with @Valid and exception handling
  • Error Handling: global @ControllerAdvice
  • Swagger/OpenAPI docs
  • Docker Compose for DB setup
  • Unit and integration testing
  • CI/CD pipeline with GitHub Actions

See TODO.md for the complete roadmap.

📚 Why This Project Exists

To serve as a live textbook for Spring Boot, JPA, and API design—bridging theory and production-grade code in one holistic resource. Perfect for:

  • Self-learners
  • Bootcamp instructors
  • Interview preparation
  • Mentorship & training

🛡️ License & Contributions

Open-source under MIT License. Contributions that enhance educational value are especially welcome.

Happy learning—and may this be the forge of your architectural mastery.