关于Spring 基于由头的AOP报错

关于Spring 基于借口的AOP报错
@Before("execution(* com.spring.Master.*(..))")
Master是一个类，实现了MyInterface这个借口，按照上面这样写不报错，一切正常
但是把Master换成MyInterface就报错了,,求各位大神看下问题在哪

主要代码如下

public interface WorkInterface {
	public void dowork();
}

@Component("master")
public class Master implements WorkInterface{

	@Override
	public void dowork() {
		// TODO Auto-generated method stub
		System.out.println("Working after meal...");
	}

}

public class DynamicProxyFactory{
	@Resource
	private Servant servant;

//	@Before("execution(* com.spring.WorkInterface.*(..))")
	@Before("execution(* com.spring.Master.*(..))")
	public void before(){	
		servant.dowork();
	}
}

public class Test {
	public static void main(String[] args) {
		BeanFactory factory=new ClassPathXmlApplicationContext("applicationContext.xml");
		WorkInterface master=(WorkInterface)factory.getBean("master");
		master.dowork();
	}
}

XML如下：

<?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:tx="http://www.springframework.org/schema/tx"
xmlns:aop="http://www.springframework.org/schema/aop" 
xmlns:context="http://www.springframework.org/schema/context"
xmlns:util="http://www.springframework.org/schema/util"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:cache="http://www.springframework.org/schema/cache"
xmlns:jdbc="http://www.springframework.org/schema/jdbc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
					http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
					http://www.springframework.org/schema/tx
					http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
					http://www.springframework.org/schema/context
					http://www.springframework.org/schema/context/spring-context-3.0.xsd
					http://www.springframework.org/schema/util 
					http://www.springframework.org/schema/util/spring-util-3.0.xsd
					http://www.springframework.org/schema/cache 
					http://www.springframework.org/schema/cache/spring-cache.xsd
					http://www.springframework.org/schema/task 
					http://www.springframework.org/schema/task/spring-task-3.0.xsd
					http://www.springframework.org/schema/jdbc
					http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd
					http://www.springframework.org/schema/aop 
					http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">

					
    <!-- 启用组件扫描 -->
	<context:component-scan base-package="com.spring"/>
	<!-- 启用注解注入 -->
	<context:annotation-config/>
	<!-- 启用AspectJ的-->
	<aop:aspectj-autoproxy />
</beans>

------解决方案--------------------
看错误日志是： 注入 Servant 的时候生成的代理对象和Servant类型不匹配造成的错误。用servant的接口试试
------解决方案--------------------
将这里的
public?class?DynamicProxyFactory{
????@Resource
????private?Servant?servant;

Servant servant; 改成 WorkInterface servant;

其他有 @Resource 及@Autowired 的地方都要改。