spring – 带有@Bean注释的BeanPostProcessor不起作用

我正在尝试创建一个BeanPostProcessor来为Map注册一些值.

如果我通过xml定义创建bean实例,BeanPostProcessor可以正常工作,但是如果我将bean定义更改为@Configuration则无效.

PostProcessor中

public class InstantiationTracingBeanPostProcessor 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 );
      return bean;
  }
}

Bean配置

import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Bean;

@org.springframework.context.annotation.Configuration
public class Configuration {
    @Bean
    public @Qualifier("InstantiationTracingBeanPostProcessor")
    InstantiationTracingBeanPostProcessor activitiConfigurationBeanPostProcessor() {
        return new InstantiationTracingBeanPostProcessor();
    }
}

组件扫描配置

<context:component-scan base-package="xyz.config"/>
<context:annotation-config/>

如果我使用上面的配置,应用程序就会挂起.但是,如果我使用下面给出的基于xml的配置,它可以正常工作.

<bean class="xyz.bean.InstantiationTracingBeanPostProcessor"/>

我在这做错了什么？

解决方法:

我认为这样做的方法是用Component注释你的BeanPostProcessor：

@Component
public class InstantiationTracingBeanPostProcessor implements BeanPostProcessor {
    //...
}

Spring会在组件扫描期间自动处理(因此无需在配置中添加@ Bean注释方法).

标签：spring,spring-ioc
来源： https://codeday.me/bug/20190826/1724728.html