无效的bean定义与类路径中定义的名字“数据源”资源[spring-mybatis]

错误如下：

Invalid bean definition with name 'dataSource' defined in class path resource [spring-mybatis.xml]: Could not resolve placeholder 'driver' in string value "${driver}"; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'driver' in string value "${driver}"

mybatis-spring配置图
![图片说明](https://img-ask.csdn.net/upload/201509/14/1442209627_559718.png)

去看一下${driver}是什么，，，

配置图如下

jdbc.properties 配置 ：