📚 Main Topics

1. Controller Setup

   • Creating a method to return a list of products.
   • Setting up the URL for the product API.

2. Service Layer Implementation

   • Introduction of a service layer to handle business logic.
   • Creation of a ProductService class with appropriate annotations.

3. Repository Layer

   • Setting up a repository interface that extends JpaRepository.
   • Using the repository to fetch data from the database.

4. Database Interaction

   • Handling empty database scenarios.
   • Inserting data into the database for testing.

5. Data Persistence Issues

   • Understanding the temporary nature of H2 database.
   • Creating a data.sql file for default data loading.

6. Error Handling and Debugging

   • Common errors encountered during development.
   • Solutions for data initialization issues.

7. Future Enhancements

   • Formatting date outputs.
   • Connecting the backend with a frontend framework (React).

✨ Key Takeaways

• Layered ArchitectureImplementing a clear separation of concerns by using controllers, services, and repositories.
• Data HandlingUnderstanding how to manage data persistence and initialization in a temporary database.
• Error ResolutionLearning to debug and resolve common issues encountered during development.

🧠 Lessons Learned

• Best PracticesUse constructor injection over field injection for better code maintainability.
• Database ManagementAlways ensure that the database schema is created before attempting to insert data.
• TestingRegularly test API endpoints using tools like Postman to ensure they return expected results.
• Data FormattingConsider user-friendly formats for data presentation, especially for dates.