Failed to load ApplicationContext 一直报错？？

Question

<?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:aop="http://www.springframework.org/schema/aop"       xmlns:tx="http://www.springframework.org/schema/tx"       xmlns:context="http://www.springframework.org/schema/context"    xsi:schemaLocation="       http://www.springframework.org/schema/beans  http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/tx  http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop  http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context  http://www.springframework.org/schema/context/spring-context.xsd        ">   <!-- 加载配置文件 -->   <context:property-placeholder location="classpath:jdbc.properties"/>      <!-- 配置c3p0连接池 -->   <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">       <property name="driverClass" value="${jdbc.driverClass}" />       <property name="jdbcUrl" value="${jdbc.url}" />       <property name="user" value="${jdbc.username}" />       <property name="password" value="${jdbc.password}" />   </bean>   <!-- 业务 -->   <bean id="accountService" class="cn.itcast.spring.Demo.AccountDaoImpl">       <property name="accountDao" ref="accountDao"></property>   </bean>      <!-- dao -->   <bean id="accountDao" class="cn.itcast.spring.Demo.AccountDaoImpl">       <property name="dataSource" ref="dataSource"></property>   </bean> </beans>package cn.itcast.spring.Demo;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:applicationContext.xml")public class SpringTest { @Resource(name="accountService") private AccountService accountService; @Test public void test1(){ accountService.transfer("aaa", "bbb", 100d); } }

Answer 1

 <!-- 业务 -->

   <bean id="accountService" class="cn.itcast.spring.Demo.AccountDaoImpl">

<!-- dao -->

   <bean id="accountDao" class="cn.itcast.spring.Demo.AccountDaoImpl">

@Resource(name="accountService")

private AccountService accountService;

看下这几句有什么问题没？已经很明显了，对象的类型不匹配。