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ApplicationContext And BeanFactory PostProcessor

File: context.xml <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"     "http://www.springframework.org/dtd/spring-beans.dtd"> <beans>   <bean id="w" class="java.lang.String">   </bean>     <bean id="allBeansLister" class="AllBeansLister"/> </beans> File: Main.java import org.springframework.beans.BeansException; import org.springframework.beans.factory.config.BeanFactoryPostProcessor; import org.springframework.beans.factory.config.ConfigurableListableBeanFactory; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; class Main {   public static void main(String args[]) throws Exception {     ApplicationContext ctx = new ClassPathXmlApplicationContext("context.xml");     ctx.getBean("w");   } } class AllBeansLister implements BeanFactoryPostProcessor {   public void postProcessBeanFactory(ConfigurableListableBeanFactory factory) throws BeansException {     System.out.println("The factory contains the followig beans:");     String[] beanNames = factory.getBeanDefinitionNames();     for (int i = 0; i < beanNames.length; ++i)       System.out.println(beanNames[i]);   } }