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Add addBeanPostProcessor 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="beanInitLogger" class="BeanInitializationLogger"/> </beans> File: Main.java import org.springframework.beans.BeansException; import org.springframework.beans.factory.config.BeanPostProcessor; 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"));     BeanInitializationLogger logger = new BeanInitializationLogger();     factory.addBeanPostProcessor(logger);     factory.preInstantiateSingletons();      } } class BeanInitializationLogger implements BeanPostProcessor {   public Object postProcessBeforeInitialization(Object bean, String beanName)       throws BeansException {     return bean;   }   public Object postProcessAfterInitialization(Object bean, String beanName)       throws BeansException {          System.out.println("Bean '" + beanName + "' initialized");     return bean;   } }