Is SwingWorker Thread Cancellation Cooperative?

Question

Hello,
Would appreciate any help in understanding this.  My understanding is that cancellation of a SwingWorker thread is cooperative.  However, that isn't what I'm seeing. 
I have code below that will stop the SwingWorker thread even though I have no operations that are interruptable.  Note for the test that I have specifically put an infinite loop in doStuff().   When I do the cancellation in the main() routine: worker.cancel(true), I end up in the done() function indicating that doInBackground() exited.  It looks like the thread is being killed even in the absence of an interruptable operation.  Note if I change to worker.cancel(false), I get the same effect.  
class AWorker extends SwingWorker<String, Object> {
  void doStuff() {'
System.out.println("Entered doStuff");   
    while (true);
  @Override
  public String doInBackground() {
    //System.out.println("doInBackground started");
    doStuff();
    return "hello";
  @Override
  protected void done() {
    try {
      System.out.println("done() entered");
      String status = get();
      System.out.println("done(): get = " + status);
    } catch (Exception e) {
      System.out.println("done(): Exception: " + e);
public class InterruptThread {
  public static void main(String[] args) throws Exception {
    AWorker worker = new AWorker();
    worker.execute();
    Thread.sleep(5000);
    worker.cancel(true);

Answer 1

Hello,
Would appreciate any help in understanding this.  My understanding is that cancellation of a SwingWorker thread is cooperative.  However, that isn't what I'm seeing. 
I have code below that will stop the SwingWorker thread even though I have no operations that are interruptable.  Note for the test that I have specifically put an infinite loop in doStuff().   When I do the cancellation in the main() routine: worker.cancel(true), I end up in the done() function indicating that doInBackground() exited.  It looks like the thread is being killed even in the absence of an interruptable operation.  Note if I change to worker.cancel(false), I get the same effect.  
class AWorker extends SwingWorker<String, Object> {
  void doStuff() {'
System.out.println("Entered doStuff");   
    while (true);
  @Override
  public String doInBackground() {
    //System.out.println("doInBackground started");
    doStuff();
    return "hello";
  @Override
  protected void done() {
    try {
      System.out.println("done() entered");
      String status = get();
      System.out.println("done(): get = " + status);
    } catch (Exception e) {
      System.out.println("done(): Exception: " + e);
public class InterruptThread {
  public static void main(String[] args) throws Exception {
    AWorker worker = new AWorker();
    worker.execute();
    Thread.sleep(5000);
    worker.cancel(true);