用xml配置bean时显示以下错误是什么原因？

The prefix "c" for attribute "c:_-ref" associated with an element type "bean

************定义一个接口********************

package beanConfigByXml;

• public interface CompactDisc {
• 
  
• void play();
• }

************实现类1********************

package beanConfigByXml;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
public class CDPlayer implements CompactDisc{

• @Autowired
• private CompactDisc cd;
• @Override
• public void play() {
• cd.play();
• 
  
• }

}

************实现类2********************

package beanConfigByXml;
import org.springframework.stereotype.Component;

• public class SgtPeppers implements CompactDisc{
• private String title="Sgt.Pepper's Lonely Hearts Club Band";
• private String artist="The Beatles";
• @Override
• public void play() {
• // TODO Auto-generated method stub
• System.out.println("Playing"+title+"by"+artist);
• }
• }

********配置文件******

• <?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
• http://www.springframework.org/schema/context">
• 
  
• <bean class="beanConfigByXml.SgtPeppers"
  
• c:_-ref="sgtPeppers" />
• <bean class="beanConfigByXml.CDPlayer"
• c:_-ref="cdPlayer" />
• <!-- -->

***********测试代码*************

package beanConfigByXml;
import static org.junit.Assert.assertNotNull;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

• @RunWith(SpringJUnit4ClassRunner.class)
• public class CDPlayerTest {
• @Autowired
• private CompactDisc cd;
• @Test
• public void cdShouldNotBeNull() {
• cd.play();
• assertNotNull(cd);
• }

xml配置就报错误，刚接触Spring,大神们看看~
The prefix "c" for attribute "c:_-ref" associated with an element type "bean

bean标签没有c:_-ref这个属性吧

spring bean是没有这个属性的，参考地址：http://blog.csdn.net/supportuat/article/details/50652935。这个属性从命名角度就是错误的，完全乱写的

****************配置文件作如下修改，增加c-空间命名*********************

• <?xml version="1.0" encoding="UTF-8"?>

• <beans xmlns="http://www.springframework.org/schema/beans"
  * xmlns:c="http://www.springframework.org/schema/c"

•   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
  

•   http://www.springframework.org/schema/context">
  

• <!-- -->

• <bean id="myplayer" class="beanConfigByXml.CDPlayer"

•   c:_-ref="mysgtPeppers" />
  

• <!-- -->

*****************测试类中作如下修改*****************
package beanConfigByXml;
import static org.junit.Assert.assertNotNull;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import beanConfigForJava.CDPlayerConfigForJava;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations="configXml.xml") //上下文配置文件java配置中使用classes=“CDPlayerConfigForJava.class”
public class CDPlayerTest {
@Autowired
private CDPlayer cd;
@Test
public void cdShouldNotBeNull() {
cd.play();
assertNotNull(cd);
}

}
CDPlayer中应用了SgtPeppers bean,这里注入CDPlayer bean就可以间接引用SgtPeppers bean.
最后输出结果：
Playing Sgt.Pepper's Lonely Hearts Club Band by The Beatles