com.mysql.jdbc.CommunicationsException
MESSAGE: Communications link failure due to underlying exception:
** BEGIN NESTED EXCEPTION **
java.net.SocketException
MESSAGE: Software caused connection abort: socket write error
解决方式：编辑/etc/my.cnf（windows下为my.ini），将超时时间设置为10年，在[mysqld]后面加入：
wait_timeout=315360000
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mysql tomcat Last packet sent to the server was 0 ms ago 异常
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