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Thread: application Task problem - updating JTree

  1. #1
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    Wink application Task problem - updating JTree

    Hi all , i am running to a problem , maybe one of you can find the problem .
    i have a JTree , and i want to update him in a Thread , since i want it to change the progress bar .
    i used the Netbeans progress bar .
    everything works fine , my only problem is , that once the Task is done , i see the JTree return to be empty .
    and not saving the root i add in the succeeded function .
    the code :
    // this is the button i press to add to start the Task
        @Action public Task  AddToList(){
            Task newTask = new runThreadFolderBrowser(getApplication());
            return newTask;
        }
     
      private class runThreadFolderBrowser extends org.jdesktop.application.Task<Object, Void> {
             private DefaultMutableTreeNode saveTreeNode;
               // <editor-fold defaultstate="collapsed" desc="Constructor of the Class">
             runThreadFolderBrowser(org.jdesktop.application.Application app){
                 // the Constructor Runs on EDT , and can Update the GUI
                 super(app);
                 treeComponents.setEditable(true);
             } 
             @Override protected Object doInBackground(){
                 CheckListItem[] allFoldersItems =  BackupServerSettings.Instance.researchBackupFolder();
                 DefaultMutableTreeNode rootNode  = new DefaultMutableTreeNode("Backup Server");
                 try {
                   succeeded(rootNode);
                    return null;
                 } catch ( NullPointerException noFolder_noConnection){
                    return null;
                 }
             }
     
             @Override protected void succeeded(Object rootNode){
                 DefaultTreeModel treemodel = (DefaultTreeModel) treeComponents.getModel(); // get the current JTree
                 treemodel.setRoot((DefaultMutableTreeNode)rootNode);  // change the Root folders of the current tree .
                 treeComponents.setRootVisible(true);
                 treeComponents.repaint(); // repaint the JTree
             }
     
             @Override protected void finished(){
             }
         }


  2. #2
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    Default Re: application Task problem - updating JTree

    ok , so problem is solved .
    i had to change the return from null to rootNode , in the doIn Background function .
    but thanks .

  3. #3
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    Default Re: application Task problem - updating JTree

    Hello idandush. Welcome to the Java Programming Forums.

    I'm glad you solved your problem! I will mark this thread as solved.
    Please use [highlight=Java] code [/highlight] tags when posting your code.
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