Spring Boot - Inversion of Control and Dependency Injection
What will happen if two beans of the same type exist and one is injected without specifying a qualifier?
What will happen if two beans of the same type exist and one is injected without specifying a qualifier?
medium📝 component behavior Q5 of 15
Step-by-Step Solution
Solution:
Step 1: Understand bean ambiguity
If multiple beans of the same type exist, Spring cannot decide which to inject without qualifier.Step 2: Identify Spring behavior
Spring throws NoUniqueBeanDefinitionException to indicate ambiguity at startup.Final Answer:
Spring throws a NoUniqueBeanDefinitionException at startup -> Option DQuick Check:
Multiple beans without qualifier = Exception thrown [OK]
Quick Trick: Multiple beans of same type need @Qualifier or exception occurs [OK]
Common Mistakes:
- Assuming Spring picks a bean silently
- Thinking Spring sets null on ambiguity
- Believing Spring merges beans automatically
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