Spring 可以懒惰地初始化 Bean(Factory)PostProcessor 吗？

Question

有人能给我解释一下吗？阅读文档后我不明白。

可以Spring init Bean(Factory)PostProcessor lazy 还是不可以？

https://docs.spring.io/spring/docs/current/spring-framework-reference/core.html#beans-factory-extension-factory-postprocessors

有个这样的块把我搞糊涂了：

As with BeanPostProcessors , you typically do not want to configure BeanFactoryPostProcessors for lazy initialization. If no other bean references a Bean(Factory)PostProcessor, that post-processor will not get instantiated at all. Thus, marking it for lazy initialization will be ignored, and the Bean(Factory)PostProcessor will be instantiated eagerly even if you set the default-lazy-init attribute to true on the declaration of your element.

Answer 1

"Can Spring init Bean(Factory)PostProcessor lazily?"问题的正确答案是"NO"。我自己查过。我创建了 2 类:

@Lazy
@Component
public class CustomBeanFactoryPostProcessor implements BeanFactoryPostProcessor {
    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
        System.out.println("bean factory!");
    }
}

和

@Lazy
@Component
public class CustomBeanPostProcessor implements BeanPostProcessor {
    @Override
    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
        System.out.println("before init!");
        return bean;
    }

    @Override
    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
        return bean;
    }
}

和运行spring申请。因此，在控制台中打印了："bean factory" 和几次 "before init"，尽管我在这些类上添加了 @Lazy 注释。

Spring 可以懒惰地初始化 Bean(Factory)PostProcessor 吗？

Can Spring init Bean(Factory)PostProcessor lazily?

java

spring

lazy-initialization

spring-bean

post-processor