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.

String url = "jdbc:mysql://" + "mysql2.000webhost.com/";
try
{
    Class.forName("com.mysql.jdbc.Driver").newInstance();
    Connection conn = DriverManager.getConnection(url + "DB_NAME", userName, passWord);
}
catch (InstantiationException | IllegalAccessException | SQLException e)
{
    System.out.println(e);
}