Before30的博客

mysql5.17升级到8.0项目连接问题因为mysql5.17异常关闭,且修复无效,进行mysql重装.重装为8.0版本,发现连接同样失败,控制台报错如图:如图显示,系统无法获得链接数据库的conection,因为采用的c3p0连接池,getConnection()的代码是无法修改的,且考虑到连接池的通用性,方法应该是不会错的.错误定位:...

Caused by: java.lang.RuntimeException: java.sql.SQLException: Connections could not be acquired from the underlying database! at cn.itcast.goods.category.service.CategoryService.findAll(CategoryServi...