mysql 连接池连接超时的问题(The last packet successfully received from the server was 2,431 milliseconds ago. The last packet sent successfully to the server was 2,417 milliseconds ago.)
org.apache.ibatis.exceptions.PersistenceException:
### Error querying database. Cause: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet successfu