Spring Boot - Inversion of Control and Dependency Injection
How can you define a Bean that depends on another Bean and ensure the dependent Bean is created first?
How can you define a Bean that depends on another Bean and ensure the dependent Bean is created first?
hard📝 Application Q9 of 15
Step-by-Step Solution
Solution:
Step 1: Understand Bean dependency ordering
@DependsOn tells Spring to create specified Beans before the annotated Bean.Step 2: Differentiate from other annotations
@Autowired injects dependencies but does not guarantee creation order. @Primary selects default Bean. @Component only registers Beans.Final Answer:
Use @DependsOn annotation on the dependent Bean -> Option AQuick Check:
Ensure Bean creation order = @DependsOn [OK]
Quick Trick: Use @DependsOn to control Bean creation order [OK]
Common Mistakes:
- Assuming @Autowired controls creation order
- Using @Primary to order Beans
- Relying on @Component alone
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