title: Scheduling a task in java
body: <p>In my java web application, I want to schedule a task. </p>
  
  <p>I have searched the web alot and couldn't find a suitable scheduler for my case. In the application I have different types of users. For a specific user type, I want to schedule a task. </p>
  
  <p>By the time a critical action is taken by a user:</p>
  
  <ul>
  <li>I want to send an email to that specific user and after 15 minutes</li>
  <li>I want to send another email and after 30 minutes</li>
  <li>I want to send another email and shut down the scheduler.</li>
  </ul>
  
  <p>I know when the users take critical actions and how to send email but I don't have much experience about scheduling. </p>
  
  <p>Can anyone help me for the case?</p>