db.properties中配置了url等jdbc连接属性：

driver=org.sqlite.JDBC
url=jdbc:sqlite:D:/xxx/data/sqliteDB/demo.db
username=
password=

spring的applicationContext.xml中配置数据源引用这些属性，但遗憾的是，运行报错了：

Caused by: java.sql.SQLException: unkow jdbc driver : ${url}

解决方案：

把MapperScannerConfigurer节那个bean的sqlSessionFactory属性

<property name="sqlSessionFactory" ref="sqlSessionFactory" />

改成：<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />

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