beginnerSpring Core Annotations
What does the @Qualifier annotation do in Spring, and when do you need it?
@Qualifier resolves ambiguity when multiple beans of the same type exist and Spring can't determine which one to autowire by type alone — you pass @Qualifier("beanName") alongside @Autowired to specify exactly which implementation to inject. Without it, Spring throws a NoUniqueBeanDefinitionException the moment more than one matching bean is found for a given injection point.
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