当你start tomcat 然后出现这样的错误时候：
但是就是数据库连接不上，但是Navicat可以连接上数据库
后台报错：Could not create connection to database server. Attempted reconnect 3 times. Giving up
这个问题的解决办法是：说实话解决了很久没成功放弃了，第二天突然好了，简直神奇
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