How to schedule task daily + onStart() in Play 2.0.4?

Scheduler tasks should be placed only in Global class. Create two tasks, schedule only once first with initialDelay = 0 milliseconds.

For the second task, you need to calculate seconds between current DateTime and next planned occurrence (ie. tomorrow at 8:00 o’clock) using common date/time classes, then set this difference as initialDelay and also set frequency to 24 hours.

In result, it will start at the application start and will schedule the task for execution each day at required hour.

Edit

There’s complete sample, (save/edit the class: /app/Global.java):

import akka.util.Duration;
import org.joda.time.DateTime;
import org.joda.time.Seconds;
import play.Application;
import play.GlobalSettings;
import play.Logger;
import play.libs.Akka;
import java.util.concurrent.TimeUnit;

public class Global extends GlobalSettings {

    @Override
    public void onStart(Application application) {


        Akka.system().scheduler().scheduleOnce(
                Duration.create(0, TimeUnit.MILLISECONDS),
                new Runnable() {
                    @Override
                    public void run() {
                        Logger.info("ON START ---    " + System.currentTimeMillis());
                    }
                }
        );

        Akka.system().scheduler().schedule(
                Duration.create(nextExecutionInSeconds(8, 0), TimeUnit.SECONDS),
                Duration.create(24, TimeUnit.HOURS),
                new Runnable() {
                    @Override
                    public void run() {
                        Logger.info("EVERY DAY AT 8:00 ---    " + System.currentTimeMillis());
                    }
                }
        );
    }

    public static int nextExecutionInSeconds(int hour, int minute){
        return Seconds.secondsBetween(
                new DateTime(),
                nextExecution(hour, minute)
        ).getSeconds();
    }

    public static DateTime nextExecution(int hour, int minute){
        DateTime next = new DateTime()
                .withHourOfDay(hour)
                .withMinuteOfHour(minute)
                .withSecondOfMinute(0)
                .withMillisOfSecond(0);

        return (next.isBeforeNow())
                ? next.plusHours(24)
                : next;
    }
}