Unstable state of quartz

Question

Unstable state of quartz

I am looking into the Quartz Task Scheduler framework (using version 1.5.2 in jboss 5.1). I am trying to understand the difference between stateful and non-stateful.

It is documented that any changes made to the JobDataMap during job execution will not persist for the next job execution for non-stationary jobs, but the same will persist across stateful jobs.

To test the above, I wrote a non-normative work in which the JobDataMap changes while the job is running. According to the above logic, changes should not be persisted or made available the next time the job is executed. However, it looks like the changes persist across the job.

Here is the job class:

 public class QuartzTask implements Job{

    @Override
    public void execute(JobExecutionContext arg) throws JobExecutionException {
        // TODO Auto-generated method stub
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(Calendar.getInstance().getTime());
        System.out.println(arg.getTrigger().getName()+"  task executed:"+timeStamp);

        System.out.println("before put:"+arg.getMergedJobDataMap().get("data"));
        arg.getJobDetail().getJobDataMap().put("data", "added");
        System.out.println("after put:"+arg.getMergedJobDataMap().get("data"));         
    }    
}