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 failureThe 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？