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.

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);