sping - Spring注入，在XML配置中引用JavaConfig，结果找不到Config中的bean

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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <!--<bean id="sgtPeppers" class="com.soundsystem.SgtPeppers"/>-->
    <!--引入JavaConfing配置类-->
    <bean class="com.soundsystem.CDConfig"/>
    <!--xml配置-->
    <bean id="cdPlayer" class="com.soundsystem.CDPlayer">
        <constructor-arg ref="sgtPeppers"/>
    </bean>
</beans>

sgtPeppers的bean配置在JavaConfig中：

package com.soundsystem;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class CDConfig {
    @Bean
    public CompactDisc sgtPeppers(){
        return new SgtPeppers();
    }
}

执行后报错：
警告: Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'cdPlayer' defined in class path resource [META-INF/spring/cdplayer-config.xml]: Cannot resolve reference to bean 'sgtPeppers' while setting constructor argument; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'sgtPeppers' available
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'cdPlayer' defined in class path resource [META-INF/spring/cdplayer-config.xml]: Cannot resolve reference to bean 'sgtPeppers' while setting constructor argument; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'sgtPeppers' available

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'sgtPeppers' available

IDEA显示是绿色的，但是为什么找不到