Spring scheduling task - run only once

Question

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 servic

Answer 1

You can extend PeriodicTrigger as follows - it checks the lastCompletionTime: it will be null if the task has never run before. You can try variation of this if you want to run the task just once at some given time.

class RunOnceTrigger extends PeriodicTrigger {
    public RunOnceTrigger(long period) {
        super(period);
        setInitialDelay(period);
    }

    @Override
    public Date nextExecutionTime(TriggerContext triggerContext) {
        if(triggerContext.lastCompletionTime() == null) {   // hasn't executed yet
            return super.nextExecutionTime(triggerContext);
        }
        return null;
    }
}