In a Spring Boot application, you have a class annotated with @Component that needs to be injected into a @Service class. What must you ensure for this injection to work correctly?

hard📝 Application Q9 of 15

Spring Boot - Spring Annotations

AThe @Service class must be annotated with @Controller

BThe @Component class must be annotated with @Repository instead

CBoth classes must be in packages scanned by Spring's component scan

DNo additional configuration is needed if classes are public

Step-by-Step Solution

Solution:

Step 1: Understand component scanning
Spring only detects beans in packages included in component scanning.
Step 2: Ensure both classes are scanned
Both the @Component and @Service classes must be in scanned packages for injection to work.
Final Answer:
Both classes must be in packages scanned by Spring's component scan -> Option C
Quick Check:
Component scan includes classes = injection works [OK]

Quick Trick: Keep all beans in scanned packages for Spring to detect them [OK]

Common Mistakes:

Changing annotations unnecessarily
Assuming public class is enough
Mixing @Service and @Controller

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More Spring Boot Quizzes

In a Spring Boot application, you have a class annotated with @Component that needs to be injected into a @Service class. What must you ensure for this injection to work correctly?

Step 1: Understand component scanning

Step 2: Ensure both classes are scanned

Final Answer:

Quick Check:

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