Spring Boot - Inversion of Control and Dependency Injection
Consider a Spring Boot service with a constructor that injects a dependency and also performs logic inside the constructor. Why is this discouraged?
Consider a Spring Boot service with a constructor that injects a dependency and also performs logic inside the constructor. Why is this discouraged?
hard📝 Application Q9 of 15
Step-by-Step Solution
Solution:
Step 1: Understand constructor responsibility
Constructor injection should only assign dependencies to fields.Step 2: Identify issues with logic in constructor
Executing business logic in constructor can cause side effects before bean is fully initialized.Final Answer:
Constructor should only assign dependencies, not execute business logic -> Option AQuick Check:
Keep constructors clean for safe dependency injection [OK]
Quick Trick: Avoid business logic inside constructors [OK]
Common Mistakes:
- Thinking Spring requires empty constructors
- Believing logic in constructor triggers double creation
- Assuming logic blocks injection
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