Unicode not visible in generated PDF file

public class JasperReportMaker
{
    public static void main(String[] args) throws Exception
    {
        // Parameters
        Map<String, Object> data = new HashMap<String, Object>();
        data.put("firstname", "ვახტანგი");
        data.put("lastname", "ლალუაშვილი");
 
        try (InputStream imageIs = JasperReportMaker.class.getResourceAsStream("/asteroids.jpg");)
        {
            byte[] byteArray = IOUtils.toByteArray(imageIs);
            String encodeToString = Base64.getEncoder().encodeToString(byteArray);
            data.put("image", encodeToString); // Save image as base64 parameter
            System.out.println(encodeToString);
        }
 
        InputStream is = JasperReportMaker.class.getResourceAsStream("/Blank_A4.jrxml");
 
        // Dummy datasource
        JRDataSource dataSource = new JREmptyDataSource();
 
        JasperReport jasperReport = JasperCompileManager.compileReport(is);
 
        JasperPrint jp = JasperFillManager.fillReport(jasperReport, data, dataSource);
 
        // Save reports
        JasperExportManager.exportReportToPdfStream(jp, new FileOutputStream("jasper-report.pdf"));
        // JasperExportManager.exportReportToPdfFile(jp, "jasper-report.pdf");
        JasperExportManager.exportReportToHtmlFile(jp, "jasper-report.html");
    }
}