Spring Boot - Advanced Patterns
What will happen if two custom auto-configuration classes both define a bean of the same type without conditional annotations?
What will happen if two custom auto-configuration classes both define a bean of the same type without conditional annotations?
medium📝 component behavior Q5 of 15
Step-by-Step Solution
Solution:
Step 1: Understand bean conflict in Spring Boot
If two beans of the same type exist without conditions, Spring Boot cannot decide which to use and throws an error.Step 2: Evaluate options
Options B and D are incorrect because Spring does not merge or silently ignore conflicts. Only the first bean will be created silently is incorrect because Spring fails fast.Final Answer:
Spring Boot will fail to start due to bean definition conflict -> Option DQuick Check:
Duplicate beans without conditions cause startup failure [OK]
Quick Trick: Avoid duplicate beans by using conditional annotations [OK]
Common Mistakes:
- Assuming Spring merges duplicate beans
- Expecting silent override without error
- Ignoring conditional annotations
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