Spring Boot - Inversion of Control and Dependency Injection
You want to inject two beans of the same type into a Spring Boot service using constructor injection. How can you distinguish them?
You want to inject two beans of the same type into a Spring Boot service using constructor injection. How can you distinguish them?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Understand multiple beans of same type problem
Spring cannot decide which bean to inject if multiple beans of the same type exist.Step 2: Use @Qualifier to specify bean names
@Qualifier annotation on constructor parameters tells Spring exactly which bean to inject.Final Answer:
Use @Qualifier annotation on constructor parameters -> Option BQuick Check:
@Qualifier resolves multiple bean injection conflicts [OK]
Quick Trick: Use @Qualifier to specify which bean to inject [OK]
Common Mistakes:
- Thinking renaming classes solves injection conflict
- Believing @Autowired alone resolves ambiguity
- Switching injection type unnecessarily
Master "Inversion of Control and Dependency Injection" in Spring Boot
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