代码运行一段时间，然后抛出通信链接失败异常 MySQL

Question

我有一个 Scala 代码，使用 scalalikejdbc 连接并在 MySQL 中执行插入操作。代码运行良好约 2-3 小时，然后抛出

com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.

我的连接设置如下：

val url = "jdbc:mysql://www.domain.com:3306/schema";

val settings = ConnectionPoolSettings(

               initialSize = 1,

               maxSize = 2,

               connectionTimeoutMillis = 100000L,

               validationQuery = "select 1 from dual");

ConnectionPool.add('dbval, url, username, pwd, settings);

发生这种情况的任何原因以及如何解决？