Databases
StackOverflow2013
Postsdbo
POJProgressBar indeterminate thread
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POJProgressBar indeterminate thread
    primarykey
    data
    text
    <p>I have a problem while creating a <code>JProgressBar</code> which is set to indeterminate. The following code is my implementation of the <code>JProgressBar</code> and is called/constructed from another class:</p> <pre><code>public class Progress implements Runnable { private JFrame frameProgress; private JProgressBar progressBar; public Progress(String title, String message) { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (Exception e) { GlobalVariables.LOGGING_logger.error("Error instatiating progress bar.", e); } UIManager.put("ProgressBar.selectionForeground", Color.black); UIManager.put("ProgressBar.selectionBackground", Color.black); this.frameProgress = new JFrame(title); this.frameProgress.setIconImage(GlobalVariables.GUI_icon.getImage()); this.frameProgress.setSize(300, 60); this.frameProgress.setLocation(16, 16); this.progressBar = new JProgressBar(); this.progressBar.setStringPainted(true); this.progressBar.setString(message); this.progressBar.setIndeterminate(true); this.frameProgress.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.frameProgress.add(this.progressBar); this.frameProgress.setResizable(false); this.frameProgress.setVisible(true); } public void start() { new Thread(this).start(); } public void close() { this.frameProgress.dispose(); this.frameProgress = null; this.progressBar = null; } @Override public void run() { SwingUtilities.invokeLater(new Runnable() { public void run() { // do nothing, because progress bar is indeterminate } }); } } </code></pre> <p>The caller of this JProgressBar is the following code snippet:</p> <pre><code> Progress p = new Progress("bla", "blub"); p.start(); boolean successfull = xmlWriter.writeCommonSettingsFromGUI(this); p.close(); </code></pre> <p>And now i want, while the <code>xmlWriter.writeCommonSettingsFromGUI(this);</code> is doing something, that the <code>JProgressBar</code> is shown to the user and is working while the algorithm is running.</p> <p>How can I achieve this? I don't know so much about threading and searched in many other forums, but I don't found any answer for my question.</p> <p>Please help me and thank you in advance ;)</p> <p>EDIT: The Progress JFrame opens up with no content for that time, the algorithm is running.</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USmKorbel
    1. USMarcel Höll
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COCan you describe what doesn't work about your current code?
      singulars
      1. POJProgressBar indeterminate thread
      1. USDuncan Jones
    2. COThe progress bar doesn't show up and i get an exception:Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at de.Progress$1.run(Progress.java:63) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:727) at java.awt.EventQueue.access$200(EventQueue.java:103))...
      singulars
      1. POJProgressBar indeterminate thread
      1. USMarcel Höll
    3. COOkay...there is no more error....but: If I start the thread, it opens up the Progress JFrame, but no content (no JProgressBar) in it...
      singulars
      1. POJProgressBar indeterminate thread
      1. USMarcel Höll
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload