Spring @Required vs @Qualifier vs @RequestMapping
@RequestMapping
This annotation is used for mapping an HTTP request to a specific class or method in the controller that will be handling it.
This annotation can be applied in class level and method level.
At a class level, it maps the URL request.
At the method level, it maps the URL as well as the HTTP request method.
@Qualifier
It is used to remove ambiguity when you create more than one bean of the same type.
It is used along with @Autowired.
@Required
It is applied to bean property setter methods.
This annotation indicates that the affected bean property must be populated at the configuration time with the help of explicit property value in a bean definition or with auto wiring.
If the affected bean property has not been populated, the container will throw BeanInitializationException.
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