Spring Boot - Inversion of Control and Dependency Injection
What happens if a Spring Boot component has multiple constructors but none is annotated with @Autowired?
What happens if a Spring Boot component has multiple constructors but none is annotated with @Autowired?
medium📝 component behavior Q5 of 15
Step-by-Step Solution
Solution:
Step 1: Recall Spring's constructor selection rules
If multiple constructors exist and none is annotated, Spring cannot decide which to use.Step 2: Identify Spring's error on ambiguity
Spring throws BeanCreationException due to ambiguous constructors.Final Answer:
Spring throws a BeanCreationException due to ambiguity -> Option AQuick Check:
Multiple constructors without @Autowired cause ambiguity error [OK]
Quick Trick: Multiple constructors need @Autowired to avoid ambiguity [OK]
Common Mistakes:
- Thinking Spring picks constructor automatically
- Assuming default constructor is always used
- Confusing exception types
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