在spring框架中使用在类路径资源[application-context.xml]中定义的名称创建bean时出错

<bean id="MyDataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="${url}"/>
        <property name="username" value="${username}"/>
        <property name="password" value="${password}"/>
    </bean>

    <bean id="template" class="org.springframework.jdbc.core.JdbcTemplate">
        <constructor-arg value="MyDataSource"/>
    </bean>
<bean id="MyDataSource" class="org.springframew