Why is it important to use @Qualifier instead of relying solely on @Primary when multiple beans of the same type exist?

hard📝 Conceptual Q10 of 15

Spring Boot - Inversion of Control and Dependency Injection

Why is it important to use @Qualifier instead of relying solely on @Primary when multiple beans of the same type exist?

A@Qualifier automatically creates beans at runtime

B@Primary disables other beans from being created

C@Qualifier allows explicit selection of a bean, avoiding ambiguity and improving clarity

D@Primary is deprecated and should not be used

Step-by-Step Solution

Solution:

Step 1: Understand @Primary behavior
@Primary marks one bean as default, but it may not cover all injection cases explicitly.
Step 2: Benefits of @Qualifier
@Qualifier explicitly specifies which bean to inject, improving code clarity and avoiding accidental injection of wrong bean.
Final Answer:
@Qualifier allows explicit selection of a bean, avoiding ambiguity and improving clarity -> Option C
Quick Check:
@Qualifier = explicit bean choice, better clarity [OK]

Quick Trick: Use @Qualifier for clear, explicit bean injection [OK]

Common Mistakes:

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