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Add BeanFactory PostProcessor To XmlBeanFactory

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.beans.factory.xml.XmlBeanFactory; import org.springframework.core.io.ClassPathResource; class Main {   public static void main(String args[]) throws Exception {     XmlBeanFactory factory = new XmlBeanFactory(new ClassPathResource("context.xml"));     factory.getBean("w");     AllBeansLister lister = new AllBeansLister();     lister.postProcessBeanFactory(factory);   } } 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]);   } }