CSVWriter with reflection

CSVwriter.java

public class CSVWriter {

    private static final String UTF8_BOM = "\uFEFF";

    public void convert(HttpServletResponse response, List<?> datas, String name) {
        write(response, transform(datas), name);
    }

    private List<String[]> transform(List<?> objects) {
        List<String[]> dataToWrite = new ArrayList<>();
        if (objects.size() == 0) {
            return dataToWrite;
        }

        dataToWrite.add(makeHeader(objects.get(0).getClass()));

        int i;
        Field[] fields;
        String[] columns;

        for (Object dto : objects) {
            i = 0;
            fields = dto.getClass().getDeclaredFields();
            columns = new String[fields.length];
            for (Field field : fields) {
                field.setAccessible(true);
                try {
                    columns[i] = field.get(dto) == null ? "" : String.valueOf(field.get(dto));
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                }
                ++i;
            }
            dataToWrite.add(columns);
        }
        return dataToWrite;
    }

    private String[] makeHeader(Class title) {
        Field[] fields = title.getDeclaredFields();
        String[] columns = new String[fields.length];

        int i = 0;
        for (Field field : fields) {
            columns[i] = field.getName();
            ++i;
        }
        return columns;
    }

    private void write(HttpServletResponse response, List<String[]> datas, String name) {
        response.addHeader("Content-disposition", "attachment;filename=" + name + ".csv");
        response.setContentType("text/plain");
        response.setCharacterEncoding("UTF-8");

        try (
                OutputStream outputStream = response.getOutputStream();
                CSVWriter writer = new CSVWriter(new OutputStreamWriter(outputStream))
        ) {
            //add BOM
            outputStream.write(UTF8_BOM.getBytes());
            writer.writeAll(datas);
            response.flushBuffer();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private String removeUTF8BOM(String s) {
        if (s.startsWith(UTF8_BOM)) {
            s = s.substring(1);
        }
        return s;
    }
}