Spring Boot - Inversion of Control and Dependency Injection
What will happen if two Beans of the same type are defined and @Autowired is used without qualifiers?
What will happen if two Beans of the same type are defined and @Autowired is used without qualifiers?
medium📝 Predict Output Q5 of 15
Step-by-Step Solution
Solution:
Step 1: Understand @Autowired behavior with multiple Beans
When multiple Beans of the same type exist, Spring cannot decide which to inject.Step 2: Identify Spring's response
Spring throws NoUniqueBeanDefinitionException to indicate ambiguity.Final Answer:
Spring throws NoUniqueBeanDefinitionException at runtime -> Option DQuick Check:
Multiple Beans no qualifier = Exception [OK]
Quick Trick: Multiple Beans need qualifiers or exception occurs [OK]
Common Mistakes:
- Assuming Spring picks first Bean silently
- Thinking Spring injects null instead of error
- Believing Spring merges Beans automatically
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