A DESCRIPTION OF THE PROBLEM :
When a SwingWorker is cancelled before the executor has picked it up for execution and calls its run() method, the done() method will never be called.

This is a major behavior change in version 21 compared to prior releases, and is a side effect of the changes in commit dbb5581 that resolved JDK-8081474.

REGRESSION : Last worked in version 17.0.11

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Create a swing worker, pass it to the executor and cancel it immediately before the executor calls the run() method of the worker.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
done() is called as in version 20 and earlier.
ACTUAL -
done() is not called.

---------- BEGIN SOURCE ----------
public class Main {

  private static class Worker extends SwingWorker {

    @Override
    protected Object doInBackground() throws Exception {
      return null;
    }
    
    @Override
    protected void done() {
      System.out.println("done called");
    }
  }
  
  public static void main(String... args) {
    Worker worker = new Worker();
    worker.execute();
    worker.cancel(false);
  }

}

---------- END SOURCE ----------

FREQUENCY : always