What are the core concepts covered in Spring Boot 3 REST Microservices & Dependency Injection?

Spring Inversion of Control (IoC) and @Autowired Dependency Injection; Building REST endpoints with @RestController and @GetMapping; Database persistence with Spring Data JPA interfaces

Advanced 22 min readModule: Module 11: Spring Boot Microservices Architecture

Spring Boot 3 REST Microservices & Dependency Injection

Build enterprise microservices with Spring Boot, @RestController, @Service, and Spring Data JPA repositories.

What You Will Learn in This Lesson

Spring Inversion of Control (IoC) and @Autowired Dependency Injection
Building REST endpoints with @RestController and @GetMapping
Database persistence with Spring Data JPA interfaces

Introduction & Core Concept

Spring Boot is the premier Java enterprise framework for building production-grade, standalone microservices and web APIs.

WHY DOES THIS MATTER IN THE REAL WORLD?

Spring Boot powers the core backend transaction engines of financial institutions, Fortune 500 enterprises, and e-commerce platforms.

Spring Boot REST Controller

java

1
2
3
4
5
6
7
8
@RestController
@RequestMapping("/api/courses")
public class CourseController {
    @GetMapping
    public List<String> listCourses() {
        return List.of("HTML5", "TypeScript", "Java 21");
    }
}

Line-by-Line Technical Breakdown

1Spring Data JPA generates SQL queries automatically based on repository method names (findByEmail).

Try It Yourself (Interactive Editor)

Modify the code in real-time and click Run to test live browser output and console logs.

Intelligent Code Runner & Live Sandbox[JAVA]

JAVA SOURCE EDITOR

Interactive Live Code

>JVM 21 (OpenJDK 64-Bit Server VM)

>Student Alex Dev passing: true | GPA: 3.94

>Java execution finished safely.

Industry Best Practices & Professional Standards

Use constructor injection instead of field @Autowired for better testability.

Lesson Summary & Core Takeaways

Spring Boot delivers enterprise-grade scalability, security, and cloud deployment.