how to write cron job in play framework 2.3

This can be done using the Global Class, and over riding the onstart method. https://www.playframework.com/documentation/2.5.x/JavaGlobal

An abstract view of the coding is given below. Hope this help

public class Global extends GlobalSettings {private Cancellable scheduler;@Overridepublic void onStart(Application application) {    int timeDelayFromAppStartToLogFirstLogInMs = 0;    int timeGapBetweenMemoryLogsInMinutes = 10;    scheduler = Akka.system().scheduler().schedule(Duration.create(timeDelayFromAppStartToLogFirstLogInMs, TimeUnit.MILLISECONDS),            Duration.create(timeGapBetweenMemoryLogsInMinutes, TimeUnit.MINUTES),            new Runnable() {                @Override                public void run() {                    System.out.println("Cron Job");                    // Call a function (to print JVM stats)                }            },            Akka.system().dispatcher());    super.onStart(application);}@Overridepublic void onStop(Application app) {    scheduler.cancel();    super.onStop(app);}}

      Akka.system().scheduler().scheduleOnce(          Duration.create(0, TimeUnit.MILLISECONDS),          new Runnable() {              public void run() {                  Logger.info("ON START ---    " + System.currentTimeMillis());              }          },          Akka.system().dispatcher()  );  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());              }          },          Akka.system().dispatcher()  );        Akka.system().scheduler().schedule(                Duration.create(0, TimeUnit.MILLISECONDS), //Initial delay 0 milliseconds                Duration.create(60, TimeUnit.SECONDS),     //Frequency 30 minutes                new Runnable() {                    @Override                    public void run() {                        Logger.info("creating the runnable");                        Logger.info("EVERY 60 MInutes ---    " + System.currentTimeMillis());                        executeAllMongoAggregations();                    }                },                Akka.system().dispatcher()        );    }      Akka.system().scheduler().scheduleOnce(          Duration.create(0, TimeUnit.MILLISECONDS),          new Runnable() {              public void run() {                  Logger.info("ON START ---    " + System.currentTimeMillis());              }          },          Akka.system().dispatcher()  );  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());              }          },          Akka.system().dispatcher()  );        Akka.system().scheduler().schedule(                Duration.create(0, TimeUnit.MILLISECONDS), //Initial delay 0 milliseconds                Duration.create(60, TimeUnit.SECONDS),     //Frequency 30 minutes                new Runnable() {                    @Override                    public void run() {                        Logger.info("creating the runnable");                        Logger.info("EVERY 60 MInutes ---    " + System.currentTimeMillis());                    }                },                Akka.system().dispatcher()        );    }

In Play role of the cron is done via Akka Scheduler - although sample is very easy - it's quite powerful tool.

More details can be found on Akka's page and even here on the StackOverflow i.e. How to schedule task daily + onStart() in Play 2.0.4? - this is sample for 2.0.4 anyway you'll be able to convert it to 2.3.x easy