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Friday, January 7, 2011

Java SWING GUI update

Today I stumbled upon a problem updating GUI SWING controls in java from a single threaded appliaction. Adding a simple invokeLate method did not work for me. jTextArea was still not updating properly. The code for updating text area looked like this:
       final String MESSAGE = newLine;
       SwingUtilities.invokeLater(new Runnable() {
           public void run() {
               jTextArea1.setText( + ": " + MESSAGE + "\n" + jTextArea1.getText());
I added a second thread and some Thread.sleep(10);'s between actions to give time for GUI thread to do its job. Unfortunately this gave me nothing. You have to create a Thread class:
public class CloneThread implements Runnable{
  private int index;
  private VMCloneInfo vmClInfo;
  public CloneThread(int index, VMCloneInfo vmClInfo) {
      this.index = index;
      this.vmClInfo = vmClInfo;
  public void run() {
      VBoxClonerView.getVBoxClonerView().cloneVM(index, vmClInfo);
and use ExecutorService. This is the key element for all this to work.
ExecutorService myExecutor = Executors.newCachedThreadPool();
myExecutor.execute((Runnable) new CloneThread(jComboBox1.getSelectedIndex(), vmCloneInfo));


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