[Solved] What is the error in the following code snippet?@Component("serviceA") class ServiceA implements Service {} @Autowired @Qualifier("serviceB") private Service service; | Spring Boot

Spring Boot - Inversion of Control and Dependency Injection

What is the error in the following code snippet?

@Component("serviceA")
class ServiceA implements Service {}

@Autowired
@Qualifier("serviceB")
private Service service;

ANo bean named 'serviceB' found for injection

BMissing @Component annotation on Service interface

CIncorrect use of @Autowired without @Qualifier

DService interface cannot be injected

Step-by-Step Solution

Solution:

Step 1: Check available beans
Only a bean named "serviceA" is defined; no bean named "serviceB" exists.
Step 2: Effect of @Qualifier("serviceB")
@Qualifier("serviceB") asks Spring to inject a bean named "serviceB", which is missing, causing an error.
Final Answer:
No bean named 'serviceB' found for injection -> Option A
Quick Check:
@Qualifier name must match existing bean [OK]

Quick Trick: Bean name in @Qualifier must exist in context [OK]

Common Mistakes:

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What is the error in the following code snippet?