数据库连接自动断开：CJCommunicationsException

报错信息：com.mysql.cj.exceptions.CJCommunicationsException: The last packet successfully received from the server was 99,117,668 milliseconds ago. The last packet sent successfully to the server was 99,123,365 milliseconds ago. is longer than the server configured value of ‘wait_timeout’. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the