title: Spring scheduling task - run only once
body: <p>Is it possible to schedule Spring service method only once at exactly specified time? For example, current time is 2pm but when I hit the action button I want that my service method starts at 8pm. I'm familiar with @Scheduled annotation and I'm not sure how to write cron expression not to run periodically. This one <code>@Scheduled(cron = "0 0 20 * * ?")</code> fires every day at 8pm.<br>
  Any suggestions?</p>