在SwingWorker中停止JProgressBar的不确定模式

Question

I want to stop the indeterminate mode of the progress bar, once my doInBackground (method of SwingWorker) returns null (meaning when my task is done). Here is my code inside the button; when I run my code, I get an error. Here is the code:

private void StartButtonMouseClicked(java.awt.event.MouseEvent evt) {                                         

final Main f22 = new Main();

initializer();

f22.getfile(FileName, 0);
f22.execute();

SwingUtilities.invokeLater(new Runnable() {

    @Override
    public void run() {
        jProgressBar1.setIndeterminate(true);
        try {
            if (f22.doInBackground() == null) {
                jProgressBar1.setIndeterminate(false);                        
            }
        } catch (IOException ex) {
            Logger.getLogger(GUI.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
});

Here is the error that I get:

#
# A fatal error has been detected by the Java Runtime Environment:
#
#  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x6e1b0750, pid=4988, tid=5464
#
# JRE version: 7.0-b141
# Java VM: Java HotSpot(TM) Client VM (21.0-b11 mixed mode, sharing windows-x86              
# Problematic frame:
# V  [jvm.dll+0xa0750]
#
# Failed to write core dump. Minidumps are not enabled by default on client  

  versions of Windows
#

Answer 1

You appear to be using your SwingWorker wrong. You should never call doInBackground() directly, and especially not right in the event dispatch thread -- this goes against the whole reason for using a SwingWorker -- but rather call execute on the SW. Add a PropertyChangeListener to the SwingWorker and change behavior based on that.

eg,

  final Main f22 = new Main();
  initializer();
  f22.getfile(FileName, 0);
  f22.addPropertyChangeListener(new PropertyChangeListener() {
     @Override
     public void propertyChange(PropertyChangeEvent pcEvt) {
        if (pcEvt.getNewValue().equals(SwingWorker.StateValue.DONE)) {
           // do your stuff here
        }
     }
  });
  f22.execute();