Spring---循环依赖-@Resource

 

 /**
     *  【循环依赖---@Resource】
     *      BeanPostProcessor ： org.springframework.context.annotation.CommonAnnotationBeanPostProcessor
     *                              org.springframework.beans.factory.config.BeanPostProcessor implementation that supports common Java annotations out of the box, in particular the JSR-250 annotations in the javax.annotation package.
     *                              BeanPostProcessor实现，支持 公共Java注解，特别是 javax.annotation 的注解；
     *
     *                              This post-processor includes support for the javax.annotation.PostConstruct and javax.annotation.PreDestroy annotations
     *                                  - as init annotation and destroy annotation, respectively - through inheriting from InitDestroyAnnotationBeanPostProcessor with pre-configured annotation types.
     *                              该BeanPostProcessor支持 javax.annotation.PostConstruct、javax.annotation.PreDestroy（通过继承的InitDestroyAnnotationBeanPostProcessor 实现）；
     *
     *
     *      public class CommonAnnotationBeanPostProcessor extends InitDestroyAnnotationBeanPostProcessor implements InstantiationAwareBeanPostProcessor, BeanFactoryAware, Serializable {
     *          public PropertyValues postProcessProperties(PropertyValues pvs, Object bean, String beanName) {}
     *      }
     *
     *
     *      AbstractAutowireCapableBeanFactory#populateBean{
     *          ...
     *          if (hasInstAwareBpps) {
     *              for (BeanPostProcessor bp : getBeanPostProcessors()) {
     *                  ...
     *                  PropertyValues pvsToUse = ibp.postProcessProperties(pvs, bw.getWrappedInstance(), beanName);
     *                  ...
     *              }
     *          }
     *          ...
     *      }
     */