Annotate Required Field Settlement For Free

To summarize, the @Qualifier annotation is used to resolve ambiguity when multiple beans of the same type exist, whereas the @Primary annotation designates a default bean to be injected when no qualifier is specified.

The @Valid annotation ensures the validation of the whole object. Importantly, it performs the validation of the whole object graph. However, this creates issues for scenarios needing only partial validation. On the other hand, we can use @Validated for group validation, including the above partial validation.

If you use @Autowired annotation on a field, that field will be autowired with bean having matching data type. @Required checks if a particular property has been set or not. If a field has been annotated with @Required annotation and that field is not set, you will get org.

@Component is a class-level annotation. It is used to denote a class as a Component. We can use @Component across the application to mark the beans as Spring's managed components.

We can enable @Required annotation in two ways in Spring XML configuration: Either by registering RequiredAnnotationBeanPostProcessor in the bean definition. Or can be implicitly registered by including the <context:annotation-config/> tag in an XML-based Spring configuration.

The @Required annotation in spring is a method-level annotation used in the setter method of a bean property and therefore making the setter-injection compulsory.

The @Required annotation in spring is a method-level annotation used in the setter method of a bean property and therefore making the setter-injection compulsory.