private void sendFeedback(List<BulkAssessmentFeedback> feedbacks) {
    if (task == null) {
      log.error("Haven't a task to know creator and modifiers of the task", null);
      return;
    }

    Identity creator = task.getCreator();
    String language = creator.getUser().getPreferences().getLanguage();
    Locale locale = I18nManager.getInstance().getLocaleOrDefault(language);
    Translator translator =
        Util.createPackageTranslator(
            BulkAssessmentOverviewController.class,
            locale,
            Util.createPackageTranslator(AssessmentManager.class, locale));
    MailManager mailManager = CoreSpringFactory.getImpl(MailManager.class);
    TaskExecutorManager taskManager = CoreSpringFactory.getImpl(TaskExecutorManager.class);

    String feedbackStr = renderFeedback(feedbacks, translator);

    MailBundle mail = new MailBundle();
    mail.setToId(creator);
    mail.setFrom(WebappHelper.getMailConfig("mailReplyTo"));
    List<Identity> modifiers = taskManager.getModifiers(task);
    if (modifiers.size() > 0) {
      ContactList cc = new ContactList("CC");
      cc.addAllIdentites(modifiers);
      mail.setContactList(cc);
    }

    String businessPath = "";
    ICourse course = CourseFactory.loadCourse(courseRes);
    CourseNode node = course.getRunStructure().getNode(courseNodeIdent);
    String courseTitle = course.getCourseTitle();
    String nodeTitle = node.getShortTitle();
    String numOfAssessedIds = Integer.toString(datas == null ? 0 : datas.getRowsSize());
    String date = Formatter.getInstance(locale).formatDateAndTime(new Date());

    mail.setContext(new MailContextImpl(courseRes, courseNodeIdent, businessPath));
    String subject =
        translator.translate("confirmation.mail.subject", new String[] {courseTitle, nodeTitle});
    String body =
        translator.translate(
            "confirmation.mail.body",
            new String[] {courseTitle, nodeTitle, feedbackStr, numOfAssessedIds, date});
    mail.setContent(subject, body);
    mailManager.sendMessage(mail);
  }
  private void createParticipantsMail(UserRequest ureq, List<Identity> participants) {
    VelocityContainer sendMessageVC = createVelocityContainer("sendmessage");
    ContactMessage cmsg = new ContactMessage(ureq.getIdentity());
    ContactList contactList = new ContactList(translate("participants.message.to"));
    contactList.addAllIdentites(participants);
    cmsg.addEmailTo(contactList);

    removeAsListenerAndDispose(contactCtr);
    contactCtr =
        new ContactFormController(ureq, getWindowControl(), false, false, false, false, cmsg);
    listenTo(contactCtr);

    sendMessageVC.contextPut("title", translate("participants.message"));
    sendMessageVC.put("contactForm", contactCtr.getInitialComponent());

    removeAsListenerAndDispose(notificationCmc);
    notificationCmc = new CloseableModalController(getWindowControl(), "close", sendMessageVC);
    listenTo(notificationCmc);

    notificationCmc.activate();
  }