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SpringBootMastery_BanqueMisr

This project demonstrates the core concepts of Dependency Injection (DI) using plain Java, Spring Core, and Spring Boot.

🔧 Project Structure & Tasks

1. DIY IoC/DI (Plain Java)

Created Printer and UserService classes.
Demonstrated constructor-based and setter-based injection.
No Spring involved — just Java wiring.

2. Spring Core Introduction

Added Spring Core dependency to a Maven project.
Annotated components with @Component.
Used AnnotationConfigApplicationContext to retrieve beans.

3. Spring Boot Setup

Bootstrapped project using Spring Initializr.
Created a simple REST controller (GreetingController) with a "Hello, Spring Boot!" endpoint.

4. Understanding `@SpringBootApplication`

Demonstrated how to exclude DataSourceAutoConfiguration.
Confirmed that no H2 DB starts when excluded.

5. Profiles & Configuration Binding

Used application.properties and application-dev.yml.
Bound configuration using @ConfigurationProperties("app").
Exposed /title endpoint to return configured title.

6. Qualified Dependency Injection

Created interface TimeService with two implementations:
- SystemTimeService (marked @Primary)
- MockTimeService (annotated with @Qualifier("mock"))
Injected into a TimeController.

🖼️ Screenshots & Notes

Check docs/annotations.md for:

Sample output screenshots
Console logs
Controller outputs
Configuration files

📦 Tech Stack

Java 17+
Spring Core
Spring Boot
Maven