之前的dao层和service层的junit测试均通过，但是输入localhost：8080/schoolshops/superadmin/listarea出现异常信息

{"errMsg":"org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException: \r\n### Error querying database. Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is java.sql.SQLException: Connections could not be acquired from the underlying database!\r\n### The error may exist in file [E:\\apache-tomcat-8.5.64\\webapps\\SchoolShops\\WEB-INF\\classes\\mapper\\AreaDao.xml]\r\n### The error may involve com.ahu.schoolshop.dao.AreaDao.queryArea\r\n### The error occurred while executing a query\r\n### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is java.sql.SQLException: Connections could not be acquired from the underlying database!","succes":false}

我的数据库名称是schoolshops
Jdbc的配置文件内容为
jdbc.driver=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql://localhost:3306/schoolshops?useUnicode=true&characterEncoding=utf8 jdbc.username=root jdbc.password=root