try {
        Class.forName("com.mysql.jdbc.Driver");
        java.sql.Connection con = DriverManager.getConnection("jdbc:mysql://11.222.33.444:3306/mybase?user=user&password=pass");
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
        return;
    } catch (SQLException e) {
        e.printStackTrace();
        return;
    }

com.mysql.cj.jdbc.exceptions.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.
    at com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsException(SQLError.java:172)
    at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:64)