Spring—JDBC—不使用事务更改数据库2个表，报错：Cannot resolve reference to bean 'stockDao' while setting bean property 'stockDao'

DEBUG:

Cannot resolve reference to bean 'stockDao' while setting bean property 'stockDao'

org.springframework.beans.factory.BeanCreationException:
 Error creating bean with name 'bankUserDao' defined in class path resource 
[applicationContext.xml]: 
Cannot resolve reference to bean 'dataSource' while setting bean property 'dataSource'; nested exception is org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [com.mchange.v2.c3p0.ComboPooledDataSource] for bean with name 'dataSource' defined in class path resource [applicationContext.xml]; nested exception is java.lang.ClassNotFoundException: com.mchange.v2.c3p0.ComboPooledDataSource

　　

配置文件信息：

applicationContext.xml

　配置思路：

stockService-->bankUserDao+stockDao-->dataSource　通过dbcp的连接池来连接数据库
完整的更改错误后的配置：

    <!-- mysql依赖 -->
    <context:property-placeholder
        location="classpath:jdbc.properties" />
    <bean id="stockService"
        class="com.java.service.impl.StockServiceImpl">
        <property name="bankUserDao" ref="bankUserDao" />
        <property name="stockDao" ref="stockDao" />
    </bean>
    <bean id="bankUserDao" class="com.java.dao.impl.BankUserDaoImpl">
        <property name="dataSource" ref="dataSource" />
    </bean>
    <bean id="stockDao" class="com.java.dao.impl.StockDaoImpl">
        <property name="dataSource" ref="dataSource" />
    </bean>

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

错误的地方：

之前使用C3P0作为连接池，一直报 ‘无法找到c3p0’ ‘无法创建stockService’ 错误

后面更改为DBCP连接后，错误解决。

错误的连接配置部分：（其他地方无错）

<!-- 使用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>

 

原因：