08_Qualifier.md

@Qualifier

Reference: Spring Docs - @Qualifier

What is @Qualifier?

Used to explicitly specify which bean to select when injecting beans in the Spring Framework

Problem

• Autowire Need for Disambiguation
  • Dependencies can be injected with the @Autowired annotation, but there are a few things to be cautious about
  • If more than one bean of the same type exists in the container, Spring will throw a NoUniqueBeanDefinitionException

Solution

The @Qualifier annotation can be used to specify the target to autowire

Things to Note When Using @Qualifier

If a bean object with the qualifier value specified in @Qualifier does not exist, a NoSuchBeanDefinitionException is thrown