The Quartz alternative for modern Java teams

public class WelcomeMailJob implements Job {
    @Override
    public void execute(JobExecutionContext ctx)
            throws JobExecutionException {
        String userId = ctx.getMergedJobDataMap()
            .getString("userId");
        new MailService().sendWelcomeMail(userId);
    }
}

Scheduler scheduler =
    StdSchedulerFactory.getDefaultScheduler();

JobDetail job = newJob(WelcomeMailJob.class)
    .withIdentity("welcome-mail", "mails")
    .storeDurably()
    .build();
scheduler.addJob(job, true);

JobDataMap data = new JobDataMap();
data.put("userId", userId);

scheduler.triggerJob(job.getKey(), data);
scheduler.start();

// run it now
BackgroundJob.enqueue(
    () -> mailService.sendWelcomeMail(userId));

// or run it tomorrow
BackgroundJob.schedule(now().plus(1, DAYS),
    () -> mailService.sendReminder(userId));

// or run it every morning at 8
BackgroundJob.scheduleRecurrently("0 8 * * *",
    () -> reportService.generateDailyReport());