Spring Framework FAQ: Top Questions
49. What are Spring qualifiers and when do you use @Qualifier?
@Qualifier is used alongside @Autowired to specify which bean to inject when multiple candidates of the same type exist.
📥 Example:
@Component("cat")
public class Cat implements Animal {}
@Component("dog")
public class Dog implements Animal {}
@Autowired
@Qualifier("dog")
private Animal animal;🏆 Expected Output:
Injects the Dog implementation into the Animal field.🛠️ Use Cases:
- Resolve bean ambiguity during autowiring.
- Customize injections for testing or profiling.