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我正在使用javax.mail.internet和发送电子邮件Biweekly，这封电子邮件有附件谷歌会议邀请。电子邮件已发送，并且还附有邀请（会议也出现在谷歌日历中）。但问题是在事件开始之前没有发送提醒（警报）电子邮件。我正在尝试在活动开始前 15 分钟发送提醒电子邮件。这是我的代码：

private String generateICalData(AddCalendarEventDto addCalendarEventDto, String fromEmailName) {
        ICalendar ical = new ICalendar();
        ical.addProperty(new Method(Method.REQUEST));
        VEvent event = new VEvent();
        event.setSummary("invite summary");
        event.setDescription("Please use this Zoom link: " + addCalendarEventDto.getMeetingLink());
        event.setLocation("Zoom");
        event.setDateStart(addCalendarEventDto.getDateStart());
        event.setDateEnd(addCalendarEventDto.getDateEnd());
        event.setDuration(new Duration.Builder()
                .minutes(addCalendarEventDto.getDurationMinutes())
                .build());
        String eventUid = addCalendarEventDto.getEventUid();
        if(eventUid != null && !"".equals(eventUid)){
            event.setUid(eventUid);
            event.setSequence(2);
        }
        event.setRecurrenceRule(new Recurrence.Builder(Frequency.WEEKLY).count(5).build());
        event.setOrganizer(new Organizer(fromEmailName, USERNAME));
        Attendee attendee = new Attendee(addCalendarEventDto.getMemberName(), addCalendarEventDto.getToEmail());
        attendee.setParticipationLevel(ParticipationLevel.REQUIRED);
        Duration reminder = Duration.builder().prior(true).minutes(15).build();
        Trigger trigger = new Trigger(reminder, Related.START);
        //Date date  = new Date(System.currentTimeMillis() + 4*60*1000L);
        //Trigger trigger = new Trigger(date);
        String subject = "Reminder: Meeting at 1pm";
        String body = "Team,\n\nThe team meeting scheduled for 1pm is about to start.  Snacks will be served!\n\nThanks,\nJohn";
        VAlarm valarm = VAlarm.email(trigger, subject, body, Arrays.asList(addCalendarEventDto.getToEmail(), "test1@gmail.com", "test2@gmail.com"));
        event.addAlarm(valarm);

        ical.addEvent(event);
        return Biweekly.write(ical).go();
    }

我也尝试了注释部分来创建Trigger对象，但结果是一样的。我的代码有问题还是应该是什么问题？

我希望在活动开始前 15 分钟发送带有定义文本的提醒电子邮件。在这种情况下，我将提醒电子邮件设置为在发送邀请后 2 分钟发送以进行测试，但它不起作用。

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