I'm new to Java Swing, and I need to make some simple Java desktop app. I have MainPanel in which I have SwingWorker with doInBackgroung in which I call service which calls a DAO that make a quering data from database.

I also have a stop button which on click set worker.cancel(true), but the program is not stopping, and I can not even close the window with the [X] button.

I suppose that the processing is not stopped immediately because the querying of the database is not done yet, but why can't I close the window?

This is the code:

worker = new SwingWorker() {

            @Override
            protected Object doInBackground() throws Exception {

                long startTime = System.nanoTime();
                textArea.append("Starting...\n");

                generatingFilesService.genereteFiles(connectionDBFirst, connectionDBSecond, connectionDBThird,
                        date1, date2);
    
                long endTime = System.nanoTime();
                double time = (double) ((endTime - startTime) / 1_000_000_000);
                if (ConnectionDBFirst.flag != false) {
                    if (time < 60d) {
                        textArea.append("Genereting ended for " + time + " seconds\n");
                        textArea.setCaretPosition(MainPanel.textArea.getDocument().getLength());
                    } else {
                        textArea.append("Genereting ended for " + (time / 60) + " minutes\n");
                        textArea.setCaretPosition(MainPanel.textArea.getDocument().getLength());
                    }
                }
                return null;
            }       
            
            @Override
            protected void done() {
                if (isCancelled()) {
                    textArea.append("Stopping generating files...\n");
                    closeConnections();
                    logger.info(Messages.PROCESS_INTERUPTED);
                } else 
                    closeConnections();
            }
        };worker.execute();

Stopping code:

if (e.getSource() == stop) {

        worker.cancel(true);

        stop.setEnabled(false);
}

UPDATE

Based on the answer and comments, here is the rest of the code:

public void genereteFiles(connectionDBFirst, connectionDBSecond, connectionDBThird,
                        date1, date2) {

    List persons1 = daoFirst.getPersons(connectionDBFirst, date1, date2);
        
    // Here I want to update the textArea() that the daoFirst.getPersons() is done
    // but how to that without MainPanel.textArea.append(...);
    
    List persons2 = daoSecond.getPersons(connectionDBSecond, date1, date2);
    
    // Here I want to update the textArea() that the daoSecond.getPersons() is done
    // but how to that without MainPanel.textArea.append(...);
    
    // same with daoThird

    genereteFilesService.createFiles(persons1, persons2, persons3);

    // update textArea() again

}

DAO code:

public List getPersons(connectionDBFirst, date1, date2) {

    // Executing SQL query and getting the persons
    // This takes long time, and from here I calculate 
    // percentage of persons fetched and I want to show the percentage in textArea()
    // but how to do that without MainPanel.textArea.append(...);
}

Now, beside initial question, how can I use publish() and process() methods to update the textArea() from generateFiles() and DAO methods?