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mysql密码过期了，今天遇到了连接mysql，总是连接不上去，
错误现象1：
An attempt by a client to checkout a Connection has timed out
第一次出现连接超时错误，第一反应是去修改cpool.checkoutTimeout参数为18000，初始为500，结果还是错误，
在修改为36000，并且加大了c3p0连接数cpool.maxPoolSize=100
这个时候出现下面错误现象2
Connections could not be acquired from the underlying database!
一直没有定位出来，靠，突然想起，以前Oracle 11g的密码存在过期的问题，mysql会不会也有呢，试试，如何做不多写，见我的博客
http://blog.csdn.net/dracotianlong/article/details/8100235
修改完毕后，重启mysql和tomcat，搞定了。估计是虚拟机的原因，google了下，没有找到比较官方的说明。bitsCN.com
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