BeanNameAware and BeanFactoryAware

BeanNameAware and BeanFactoryAware

The first one makes the object aware of their bean name in a bean factory.

The second interface gives the bean access to the Bean Factory that created it.

1. The xxxAware interface is a common pattern used within the Spring framework. They are typically used to allow a Spring managed bean to be given an object (via the interfaces setXxx method) at Spring bootstrap time.
2. Springs documentation says this about the Aware interface, which is a super interface to the two you mention:
3. Marker superinterface indicating that a bean is eligible to be notified by the Spring container of a particular framework object through a callback-style method.

public class HelloWorld  implements BeanNameAware, BeanFactoryAware{

       private String msg;

       public String getMsg() {

              return msg;

       }

       public void setMsg(String msg) {

              this.msg = msg;

       }

       @Override

       public void setBeanFactory(BeanFactory beanFactory) throws BeansException {

               System.out.println("received the beanFactory " + beanFactory);

             

       }

       @Override

       public void setBeanName(String name) {

               System.out.println("the name of the bean is " + name);

             

       }

}

Bean definition

<bean id="messanger" class="com.shambhu.bean.HelloWorld">

      <property name="msg" value="Hello World" />

</bean>

Testing

public class HelloMain {

    public static void main(String[] args) {

ApplicationContext beanFactory = new ClassPathXmlApplicationContext(

                           "spring-beans.xml");

        HelloWorld messanger = (HelloWorld) beanFactory.getBean("messanger");

        System.out.println(messanger.getMsg());

    }

}

OutPut

Jun 06, 2014 11:22:52 PM org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh

INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@7dbc345a: startup date [Fri Jun 06 23:22:52 IST 2014]; root of context hierarchy

Jun 06, 2014 11:22:52 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions

INFO: Loading XML bean definitions from class path resource [spring-beans.xml]

the name of the bean is messanger

received the beanFactory org.springframework.beans.factory.support.DefaultListableBeanFactory@71a7cdd0: defining beans [messanger]; root of factory hierarchy

Hello World