Spring ApplicationContext CustomEvent

Spring CustomEvent Example
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import org.springframework.context.ApplicationEvent;

public class CustomEvent extends ApplicationEvent{
   
   public CustomEvent(Object source) {
      super(source);
   }

   public String toString(){
      return "My Custom Event";
   }
}

import org.springframework.context.ApplicationEventPublisher;
import org.springframework.context.ApplicationEventPublisherAware;

public class CustomEventPublisher 
   implements ApplicationEventPublisherAware {
   
   private ApplicationEventPublisher publisher;

   public void setApplicationEventPublisher
              (ApplicationEventPublisher publisher){
      this.publisher = publisher;
   }

   public void publish() {
      CustomEvent ce = new CustomEvent(this);
      publisher.publishEvent(ce);
   }
}

import org.springframework.context.ApplicationListener;

public class CustomEventHandler 
   implements ApplicationListener<CustomEvent>{

   public void onApplicationEvent(CustomEvent event) {
      System.out.println(event.toString());
   }

}

import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MainApp {
   public static void main(String[] args) {
      ConfigurableApplicationContext context = 
      new ClassPathXmlApplicationContext("Beans.xml");
   
      CustomEventPublisher cvp = 
      (CustomEventPublisher) context.getBean("customEventPublisher");
      cvp.publish();  
      cvp.publish();
   }
}