[Solved] What is wrong with this Spring Boot code snippet that uses IoC?@Component public class Service { private Repository repo; public Service() { repo = new Repository(); } } | Spring Boot

Spring Boot - Inversion of Control and Dependency Injection

What is wrong with this Spring Boot code snippet that uses IoC?

@Component
public class Service {
  private Repository repo;

  public Service() {
    repo = new Repository();
  }
}

ANo error, this is correct IoC usage.

BService class must not have a constructor.

C@Component annotation is missing on Repository class.

DRepository should be injected by Spring, not created with new.

Step-by-Step Solution

Solution:

Step 1: Identify manual object creation
The Service class creates Repository with new, bypassing Spring IoC container.
Step 2: Explain correct IoC practice
Spring should inject Repository using @Autowired to manage dependencies and lifecycle.
Final Answer:
Repository should be injected by Spring, not created with new. -> Option D
Quick Check:
Manual new breaks IoC, use injection [OK]

Quick Trick: Avoid new; let Spring inject dependencies with @Autowired [OK]

Common Mistakes:

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What is wrong with this Spring Boot code snippet that uses IoC?