Explain @Required annotation in Spring framework.

The @Required annotation applies to bean property setter methods and it indicates that the represented bean property is required and must be initialized in XML configuration file at configuration time otherwise the container will throw a BeanInitializationException exception.

public class Employee {
   private Integer age;
   private String name;
  public Integer getAge() {
      return age;
   } @Required
   public void setAge(Integer age) {   this.age = age;
   }
}

The RequiredAnnotation BeanPostProcessor bean post processor checks if all the bean properties with the @Required annotation have been set. To enable this bean post processor, you must register it in the Spring IoC container.

<bean class="org.springframework.beans.factory.annotation.RequiredAnnotationBeanPostProcessor" />

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