Spring Boot uses @Autowired to automatically inject beans (objects) into your classes. But what if you have two classes implementing the same interface?
Spring will get confused 😕 because it won't know which one to use.
That’s where @Qualifier comes in!
It tells Spring exactly which implementation to inject.
@Qualifier("textMessenger") matches the class name (with lowercase first letter).
So Spring will inject TextMessenger here.
Summary:
@Autowired:-Injects a bean automatically
@Qualifier:-Chooses the correct bean when multiple exist
When multiple classes implement the same interface, always use @Qualifier to tell Spring which one to use. It's like saying:
“Spring, pick this one!”