c3p0连接mysql异常

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com.mchange.v2.resourcepool.TimeoutException: A client timed out while waiting to acquire a resource from com.mchange.v2.resourcepool.BasicResourcePool@79207381 -- timeout at awaitAvailable()

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网上的整体解决方案

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?3useUnicode=true&characterEncoding=utf8
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;

7.jdbc驱动要放到jre里面。

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我的问题在

jdbc.properties的url配置没有加上时区！！

应该为：

jdbc.url=jdbc:mysql://localhost:3306/seckill?useUnicode=true&characterEncoding=utf8&useSSL=false&serverTimezone=Asia/Shanghai