Spring中的报错：no matching editors or conversion strategy found

错误背景：测试SpringJDBC时创建了一个bean叫做Person,通过PersonService和PersonDao的操作将一个Person对象保存进入数据库。
具体代码：

//PersonDao类
package com.tt.springjdbc;

import org.springframework.jdbc.core.support.JdbcDaoSupport;

public class PersonDao extends JdbcDaoSupport implements PersonInter{
    public void savePerson(){
        this.getJdbcTemplate().execute("update person set pname='shuai ge' where pid=3");
    }
}

//PersonService接口：
package com.tt.springjdbc;

public interface PersonService {
    public void savePerson();
}

//PersonService接口的实现类：
package com.tt.springjdbc;

public class PersonServiceImpl implements PersonService{
    private PersonDao personDao;

    public PersonDao getPersonDao() {
        return personDao;
    }

    public void setPersonDao(PersonDao personDao) {
        this.personDao = personDao;
    }

    public void savePerson() {
        // TODO Auto-generated method stub
        this.personDao.savePerson();
    }

}

//导致错误的关键配置文件信息：
 <bean id="personDao" class="com.tt.springjdbc.PersonDao">
        <property name="dataSource">
            <ref bean="dataSource"/>
        </property>
      </bean>
     <bean id="personService" class="com.tt.springjdbc.PersonServiceImpl">
        <property name="personDao">
            <ref bean="personDao"/>
        </property>
     </bean>

报错信息：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'personService' defined in class path resource [applicationContext.xml]: 
Initialization of bean failed; nested exception is org.springframework.beans.TypeMismatchException: Failed to convert property value of type [$Proxy4 implementing com.tt.springjdbc.PersonInter,org.springframework.beans.factory.InitializingBean,org.springframework.aop.SpringProxy,
org.springframework.aop.framework.Advised] to required type [com.tt.springjdbc.PersonDao] for property 'personDao'; nested exception is java.lang.IllegalArgumentException: Cannot convert value of type [$Proxy4 implementing 
com.tt.springjdbc.PersonInter,org.springframework.beans.factory.InitializingBean,org.springframework.aop.SpringProxy,
org.springframework.aop.framework.Advised] to required type [com.tt.springjdbc.PersonDao] for property 'personDao':
 no matching editors or conversion strategy found

错误原因：出错后百度这个错误信息，在一位大神的博客里找到了答案。原因在于PersonService中保存的应该是一个接口，而我当时为了省事就直接把PersonDao写成了一个类，没有定义接口。
错误改正：得知了错误原因之后，我写了一个接口叫做PersonInter，用PersonDao当做它的实现类，并且在PersonServiceImpl中保存PersonInter,并且相应地在配置文件中进行了修改，于是错误被解决。

排错感悟：排除了这个错误之后真真切切地体会到了Spring是一个完全的面向接口编程的框架，这样实现了解耦，带来了极大的灵活性，真的佩服框架的设计师，牛。