public SimpleRecoveryJob() 
{

}

Quartz requires a public empty constructor so that the scheduler can instantiate the class whenever it needs.

 public  void execute(JobExecutionContext context) throws JobExecutionException 
{
        String jobName = context.getJobDetail().getFullName();
        // if the job is recovering print a message
        if (context.isRecovering()) {
            _log.info("SimpleRecoveryJob: " + jobName + " RECOVERING at " + new Date());
        } else {
            _log.info("SimpleRecoveryJob: " + jobName + " starting at " + new Date());
        }
        // delay for ten seconds
        long delay = 10L * 1000L;
        try {
            Thread.sleep(delay);
        } catch (Exception e) {
        }
        JobDataMap data = context.getJobDetail().getJobDataMap();
        int count;
        if (data.containsKey(COUNT)) {
            count = data.getInt(COUNT);
        } else {
            count = 0;
        }
        count++;
        data.put(COUNT, count);
        _log.info("SimpleRecoveryJob: " + jobName + 
                " done at " + new Date() + 
                "\n Execution #" + count);
}

Called by the org.quartz.Scheduler when a org.quartz.Trigger fires that is associated with the Job.