title: Quartz Cron Trigger which fires a job for every 40 seconds
body: <p>I faced a weird situation, where I have an only option to use Cron trigger and need to trigger a job for every 40 seconds. Is this possible with Cron trigger. If yes, can you please help.</p>
  
  <p>My expression could go like below:</p>
  
  <p>0/40 * * * * ?</p>
  
  <p>actual result:</p>
  
  <ul>
  <li>job executed at 12:00:00 </li>
  <li>job executed at 12:00:40</li>
  <li>job executed at 12:01:00</li>
  <li>job executed at 12:01:40</li>
  </ul>
  
  <p>expected result:</p>
  
  <ul>
  <li>job executed at 12:00:00</li>
  <li>job executed at 12:00:40</li>
  <li>job executed at 12:01:20</li>
  <li>job executed at 12:02:00</li>
  </ul>
  
  <p>Thanks in advance...</p>