/**
     * Convert a class to array with strings
     *
     * @param lines a list where save all lines
     * @param root a class with config fields
     * @param instance a instance of this class
     */
    private void save(List<String> lines, Class root, final Object instance) {
        try {
            for (Field field : root.getDeclaredFields()) {
                if (field.getAnnotation(Ignore.class) != null) { //Skip this field
                    continue;
                }
                Comment comment = field.getAnnotation(Comment.class);
                if (comment != null) { //Add comments
                    for (String line : comment.value()) {
                        lines.add("# " + line);
                    }
                }
                Alias alias = field.getAnnotation(Alias.class);
                String name = alias == null ? field.getName() : alias.value();
                setAccessible(field);
                if (field.getAnnotation(Create.class) != null) {
                    lines.add(toTableName(name));
                    Class<?> current = field.getType();
                    Object value = field.get(instance);
                    if (value == null) {
                        Constructor<?> constructor = current.getDeclaredConstructor();
                        constructor.setAccessible(true);
                        field.set(instance, value = constructor.newInstance());
                    }
                    save(lines, current, value); // read a fields from a section(table)
                } else {
                    if (field.getAnnotation(AsMap.class) != null) {
                        Map<String, ?> map = (Map<String, ?>) field.get(instance);
                        for (Entry<String, ?> entry : map.entrySet()) {
                            lines.add(entry + " = " + toString(entry.getValue()));
                        }
                        continue;
                    }
                    Object value = field.get(instance);
                    if (field.getAnnotation(AsBytes.class) != null) {
                        value = new String((byte[]) value, StandardCharsets.UTF_8);
                    }
                    lines.add(name + " = " + toString(value));
                    lines.add("");
                }
            }
        } catch (IllegalAccessException | IllegalArgumentException | SecurityException | NoSuchFieldException | InstantiationException | InvocationTargetException | NoSuchMethodException e) {
            logger.log(Level.ERROR, "", e);
        }
    }