1、问题描述
The last packet successfully received from the server was 1 milliseconds ago. The last packet sent successfully to the server was 0 milliseconds ago.)
at org.apache.commons.dbcp.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:1549)
at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1388)
at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:1044)
at org.apache.ibatis.transaction.jdbc.JdbcTransaction.openConnection(JdbcTransaction.java:139)
at org.apache.ibatis.transaction.jdbc.JdbcTransaction.getConnection(JdbcTransaction.java:61)
at org.apache.ibatis.session.defaults.DefaultSqlSession.getConnection(DefaultSqlSession.java:298)
... 38 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
2、问题原因
其实这个问题的原因是各种各样的，网上有超时的还有别的，处理方法也不同，这里我的问题是因为jdbc版本和mysql不匹配的问题导致的。
大家要根据自己的实际问题处理。
3、解决办法
更改jdbc的驱动：
更改为：
