Spring E-Commerce Application

A comprehensive Spring Boot application for an e-commerce platform, demonstrating the use of Spring MVC, Spring Data JPA, and Spring Security. The project is structured to showcase best practices in dependency injection, service-oriented architecture, and data management.

Key Features

Dependency Injection & Inversion of Control (IoC)

• Uses Spring's IoC container to manage beans and dependencies.
• Demonstrates field, constructor, and setter injection.
• Includes examples of @Autowired, @Qualifier, and @Primary annotations.

Application Layers

1. Controller Layer:

   • Handles HTTP requests and responses using @RestController, @RequestMapping, and related annotations.
   • Example: HomeController for greeting messages and managing endpoints.

2. Service Layer:

   • Contains business logic classes.
   • Example: ProductService manages product-related operations like fetching and filtering.

3. Repository Layer:

   • Implements data persistence using Spring Data JPA.
   • Uses Hibernate for ORM and demonstrates the use of @Query for custom JPQL queries.

Spring MVC Architecture

• Handles both layout and data transfers.
• Front Controller maps incoming HTTP requests to the appropriate handler methods.

Database Management

• Configured with H2 Database for lightweight, in-memory persistence during development.
• Demonstrates Spring Boot's application.properties for database and server configuration.

Security

• Utilizes Spring Security for authentication and access control.
• Includes examples of session management and filters for secure data handling.

REST API Endpoints

• Implements @GetMapping, @PostMapping, and other HTTP method annotations.
• Example: /products endpoint to retrieve all products or search by ID.

Additional Features

• Cross-Origin Resource Sharing (CORS): Uses @CrossOrigin to allow requests from different domains.
• Error Handling: Demonstrates the use of ResponseEntity for sending HTTP status codes alongside responses.

Libraries and Tools

• Lombok: Reduces boilerplate code for getters, setters, and constructors.
• Jackson: Facilitates JSON serialization and deserialization.

How to Run

1. Clone the repository:
2. Navigate to the project directory:
3. Build the application:
4. Run the application:
5. Access the application at http://localhost:8080.

Configuration

Modify application.properties for custom configurations:

server.port=8081
spring.datasource.url=jdbc:h2:mem:testDB
spring.datasource.driverClassName=org.h2.Driver
spring.jpa.show-sql=true