How to create pdf file and send in mail of spring boot application

I am trying to send email with created pdf document as the attachment, the environment i am working is the REST based java spring boot application,

Actually i know how to send email with the thymeleaf template engine, but how can i create a pdf document in memory, and send it as a attachment, this is the code that i am using for sending email.

Context cxt = new Context();
cxt.setVariable("doctorFullName", doctorFullName);
String message = templateEngine.process(mailTemplate, cxt);
emailService.sendMail(MAIL_FROM, TO_EMAIL,"Subject", "message");

and this this the sendmail() function

 @Override
    public void sendPdfMail(String fromEmail, String recipientMailId, String subject, String body) {
        logger.info("--in the function of sendMail");
        final MimeMessage mimeMessage = this.mailSender.createMimeMessage();
        try {
            final MimeMessageHelper message = new MimeMessageHelper(mimeMessage, true, "UTF-8");
            message.setSubject(subject);
            message.setFrom(fromEmail);
            message.setTo(recipientMailId);
            message.setText(body, true);

            FileSystemResource file = new FileSystemResource("C:\\xampp\\htdocs\\project-name\\logs\\health360-logging.log");
            message.addAttachment(file.getFilename(), file);


            this.mailSender.send(mimeMessage);
            logger.info("--Mail Sent Successfully");
        } catch (MessagingException e) {
            logger.info("--Mail Sent failed ---> " + e.getMessage());
            throw new RuntimeException(e.getMessage());
        }
    }

Actually i need to create a kind of report with 2-3 pages as pdf file, and send in mail.

Also i need to send multiple pdf reports, in the mail, how can i do this, can you friends help me on this, i found something called jasper, is it something related to my environment,