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.

Connection conn;
                String dbuser ="usrname";
                String dbpassw = "pass";
                String databaseName = "dbname";

                String url = "jdbc:mysql://"MY IP HERE":3306/"+databaseName;

                Class.forName("com.mysql.jdbc.Driver");
                conn = DriverManager.getConnection(url,dbuser,dbpassw);
                Statement st = conn.createStatement();