解决：Connections could not be acquired from the unde

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以上问题可能有一下原因造成：

1，驱动配置有误：driver=com.mysql.jdbc.Driver
2，数据库连接地址有误：url=jdbc:mysql://localhost:3306/test
3，密码或帐号有误：username=root password=root

4，数据库未启动或无权访问

5，项目未引入对应的驱动jar包mysql-connector-java-5.1.6-bin.jar

6,mysql root没有远程访问的权限，需要增加权限，增加权限的步骤如下：
进入mysql数据库：
grant all privileges on *.* to 'root'@'%' identified by 'root' with grant option;
flush privileges;

补充：如果用的数据连接池，可能存在数据连接池配置错误导致该问题存在，因此要尝试多个连接池，做排除法。

转载于:https://my.oschina.net/u/1756147/blog/364817

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