As per the Javadoc for the @Schedule annotation, the default values are: * for all fields except hour, minute, and second; and 0 for hour, minute, and second, by default. By specifying minute=”*” and leaving hour at its default of 0, it requests that the timer run every minute after midnight for one hour (i.e., … Read more
If only 1 timer may ever be active at the same time, there are a couple of solutions. First of all the @Timer should probably be present on an @Singleton. In a Singleton methods are by default write-locked, so the container will automatically be locked-out when trying to invoke the timer method while there’s still … Read more
If you look at the documentation, there is a note that explicitly calls out this phenomenon. The note is under section 25.5.1 at this link, and reads: Make sure that you are not initializing multiple instances of the same @Scheduled annotation class at runtime, unless you do want to schedule callbacks to each such instance. … Read more
final AlertDialog.Builder dialog = new AlertDialog.Builder(this).setTitle(“Leaving launcher”).setMessage(“Are you sure you want to leave the launcher?”); dialog.setPositiveButton(“Confirm”, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int whichButton) { exitLauncher(); } }); final AlertDialog alert = dialog.create(); alert.show(); // Hide after some seconds final Handler handler = new Handler(); final Runnable runnable = new Runnable() { @Override … Read more
Your command is fine! To run from 7.00 until 19.45, every 15 minutes just use */15 as follows: */15 07-19 * * * /path/script ^^^^ ^^^^^ That is, the content */15 in the minutes column will do something every 15 minutes, while the second column, for hours, will do that thing on the specified range … Read more
Please read the other answers and comments, there’s a lot more information stated and nuances described (hash functions?) that I did not know when I answered this question. According to Jenkins’ own help (the “?” button) for the schedule task, 5 fields are specified: This field follows the syntax of cron (with minor differences). Specifically, … Read more
Advantage of ScheduledExecutorService over Timer I wish to offer you an alternative to Timer using – ScheduledThreadPoolExecutor, an implementation of the ScheduledExecutorService interface. It has some advantages over the Timer class, according to “Java in Concurrency”: A Timer creates only a single thread for executing timer tasks. If a timer task takes too long to … Read more
Actually under Windows you do not even have to create a batch file first to use the Scheduler. Open the scheduler: START -> All Programs -> Accesories -> System Tools -> Scheduler Create a new Task under tab Action, create a new action choose Start Program browse to Rscript.exe which should be placed e.g. here: … Read more