Spring Boot - Inversion of Control and Dependency Injection
What will happen if Spring finds multiple beans of the same type but
@Autowired is used without qualifiers?What will happen if Spring finds multiple beans of the same type but @Autowired is used without qualifiers?
medium📝 Conceptual Q5 of 15
Step-by-Step Solution
Solution:
Step 1: Understand Spring behavior with multiple beans
If multiple beans of the same type exist, Spring cannot decide which to inject without qualifiers.Step 2: Identify the error thrown
Spring throws NoUniqueBeanDefinitionException to indicate ambiguity.Final Answer:
Spring throws NoUniqueBeanDefinitionException at runtime -> Option BQuick Check:
Multiple beans without qualifier = NoUniqueBeanDefinitionException [OK]
Quick Trick: Multiple beans need @Qualifier or error occurs [OK]
Common Mistakes:
- Thinking Spring picks first bean silently
- Assuming null is injected on ambiguity
- Believing compile-time warning occurs
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