对于自定义注解这里就不唠叨了，百度一大堆，这里有我一个自定义注解

@Retention(RetentionPolicy.RUNTIME)
@Target({ ElementType.METHOD })
public @interface MsgEvent {
    RetailOrderEvent msgEvent();
}

注解实现类

@Component
public class MsgEventProcessor implements BeanPostProcessor {
    /**
     * 事件消息注解与实例Bean的映射对象
     */
    public static Map<String, ServiceBean> EVENTCODESERVICEBEANMAP = new HashMap<String, ServiceBean>();

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

    @Override
    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
        Method[] methods = ReflectionUtils.getAllDeclaredMethods(bean.getClass());
        if (methods != null) {
            for (Method method : methods) {
                MsgEvent myMsgEvent = AnnotationUtils.findAnnotation(method, MsgEvent.class);
                if (myMsgEvent != null) {
                    String eventCode = myMsgEvent.msgEvent().eventCode();
                    ServiceBean servieBean = new ServiceBean();
                    servieBean.setServiceBeanObj(bean);
                    servieBean.setServiceMethod(method);
                    Class<?> argsCls = method.getParameterTypes()[0];
                    servieBean.setArgsCls(argsCls);
                    EVENTCODESERVICEBEANMAP.put(eventCode, servieBean);
                }
            }
        }
        return bean;
    }
}

调用者

@MsgEvent(msgEvent = RetailOrderEvent.PLACE_GENERALRETAILORDER)
    public Person getPerson(Person p) {
        return personMapper.getPerson(p.getId());
    }

spring boot debug模式下启动一直不会再代码红色部分停下，说明没有获取到自定义注解

原因是发现bean为jdk代理

解决办法

@SpringBootApplication
@EnableAspectJAutoProxy(exposeProxy = true)
public class Application {
    
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

或者

@ImportResource(locations = { "classpath:spring-basic.xml" })
@SpringBootApplication
//@EnableAspectJAutoProxy(exposeProxy = true)
public class Application {
    
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

spring-basic.xml

<?xml version="1.0" encoding="UTF-8" ?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:aop="http://www.springframework.org/schema/aop"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.1.xsd  
    http://www.springframework.org/schema/context  
    http://www.springframework.org/schema/context/spring-context-3.1.xsd        
    http://www.springframework.org/schema/aop  
    http://www.springframework.org/schema/aop/spring-aop-3.1.xsd ">

    <!-- 配置使Spring采用CGLIB代理 -->
  	<aop:aspectj-autoproxy expose-proxy="true" proxy-target-class="true" />
    
</beans>

____________________

上述会让所有的都采用CGLIB代理，如果只想对使用的类采用，其他的还是原来的话就可以对注解使用类上标注@Configuration代替@Component