报错提示

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <!--    开启驼峰命名转换-->
    <settings>
        <setting name="mapUnderscoreToCamelCase" value="true"/>
    </settings>
    <!--    设置默认指向的数据库dev-->
    <environments default="dev">
        <!--    配置环境，不同的环境不同的id名字-->
        <environment id="dev">
            <!--        采用JDBC方式对数据库事务进行commit/rollback-->
            <transactionManager type="JDBC"></transactionManager>
            <!--        采用连接池方式管理数据库连接-->
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/imooc_oa?useSSL=false&amp;useUnicode=true&amp;characterEncoding=UTF-8"/>
                <property name="username" value="root"/>
                <property name="password" value="1644661573"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="mappers/test.xml"/>
    </mappers>
</configuration>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="test">
    <select id="sample" resultType="String">
        select '臭老弟'
    </select>
</mapper>

报错提示：### Error querying database.  Cause: java.sql.SQLException: Error setting driver on UnpooledDataSource. Cause: java.lang.ClassNotFoundException: Cannot find class: com.mysql.jdbc.driver

老师这种情况怎么办啊