报错的问题

package com.wp.demo3;

import org.aopalliance.intercept.MethodInterceptor;

import org.aopalliance.intercept.MethodInvocation;

public class Around implements MethodInterceptor{

public Object invoke(MethodInvocation invocation) throws Throwable {

// TODO Auto-generated method stub

System.out.println("环绕前置增强");

Object obj = invocation.proceed();

System.out.println("环绕后置增强");

return obj;

}

}

package com.wp.demo3;

import java.lang.reflect.Method;

import org.aopalliance.intercept.MethodInterceptor;

import org.springframework.aop.MethodBeforeAdvice;

public class Before implements MethodBeforeAdvice{

public void before(Method method, Object[] args, Object target) throws Throwable {

// TODO Auto-generated method stub

System.out.println("前置增强");

}

}

package com.wp.demo3;

public class ProductDao {

public void save() {

// TODO Auto-generated method stub

System.out.println("保存商品....");

}

public void updata() {

// TODO Auto-generated method stub

System.out.println("修改商品....");

}

public void delete() {

// TODO Auto-generated method stub

System.out.println("删除商品....");

}

public void find() {

// TODO Auto-generated method stub

System.out.println("查询商品....");

}

package com.wp.demo3;

public interface UserDao {

public void save();

public void updata();

public void delete();

public void find();

}

package com.wp.demo3;

public class UserDaoImpl implements UserDao {

public void save() {

// TODO Auto-generated method stub

System.out.println("保存用户....");

}

public void updata() {

// TODO Auto-generated method stub

System.out.println("修改用户....");

}

public void delete() {

// TODO Auto-generated method stub

System.out.println("删除用户....");

}

public void find() {

// TODO Auto-generated method stub

System.out.println("查询用户....");

}

}

package com.wp.demo3;

import javax.annotation.Resource;

import org.junit.Test;

import org.junit.runner.RunWith;

import org.springframework.test.context.ContextConfiguration;

import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@RunWith(SpringJUnit4ClassRunner.class)

@ContextConfiguration("classpath:demo3.xnl")

public class Demo3 {

@Resource(name = "userDao")

private UserDao userDao;

@Resource(name = "productDao")

private ProductDao productDao;

@Test

public void test() {

userDao.delete();

userDao.find();

userDao.save();

userDao.updata();

productDao.delete();

productDao.find();

productDao.save();

productDao.updata();

}

}

<project xmlns="http://maven.apache.org/POM/4.0.0"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

<modelVersion>4.0.0</modelVersion>

<groupId>com.wp</groupId>

<artifactId>spring-aop</artifactId>

<packaging>war</packaging>

<version>0.0.1-SNAPSHOT</version>

<name>spring-aop Maven Webapp</name>

<url>http://maven.apache.org</url>

<dependencies>

<dependency>

<groupId>junit</groupId>

<artifactId>junit</artifactId>

<version>4.12</version>

</dependency>

<dependency>

<groupId>javax.servlet</groupId>

<artifactId>javax.servlet-api</artifactId>

<version>3.1.0</version>

</dependency>

<!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->

<dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-context</artifactId>

<version>5.1.5.RELEASE</version>

</dependency>

<!-- https://mvnrepository.com/artifact/org.springframework/spring-beans -->

<dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-beans</artifactId>

<version>5.1.5.RELEASE</version>

</dependency>

<!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->

<dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-core</artifactId>

<version>5.1.5.RELEASE</version>

</dependency>

<!-- https://mvnrepository.com/artifact/org.springframework/spring-expression -->

<dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-expression</artifactId>

<version>5.1.5.RELEASE</version>

</dependency>

<dependency>

<groupId>aopalliance</groupId>

<artifactId>aopalliance</artifactId>

<version>1.0</version>

</dependency>

<dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-aop</artifactId>

<version>5.1.5.RELEASE</version>

</dependency>

<dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-test</artifactId>

<version>5.1.5.RELEASE</version>

</dependency>

</dependencies>

<build>

<finalName>spring-aop</finalName>

</build>

</project>

<?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 = "userDao" class = "com.wp.demo3.UserDaoImpl"/>

       <bean id = "productDao" class = "com.wp.demo3.ProductDao"/>

       <bean id = "myBefore" class = "com.wp.demo3.Before"/>

       <bean id = "myAround" class = "com.wp.demo3.Around"/>

       <bean class = "org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">

        <property name = "benaName" value = "*Dao"/>

        <property name = "interceptorNames" value="myBefore"/>

       </bean>

</beans>