Java / Swing & # 8594; Creating a JFrame Notification and a "Frame Display" error

Question

Ok, I'm not so good at Java / Swing and I have a problem. My application throws this error: "Exception in thread" AWT-EventQueue-0 "java.awt.IllegalComponentStateException: frame is available for display". Google does not generate much information about this error, and a quick search of StackOverflow does not show anything yet.

What I'm trying to do: just implement translucent windows using code from tutorials. It. I plan to use this as a general window for displaying notifications such as "This program has not been launched in 30 days" next to the system tray.

Are there any experienced Java / Swing gurus who can detect my beginner error?

Thanks.

/* * To change this template, choose Tools | Templates * and open the template in the editor. */ package energizingemerald; /** * */ import java.awt.*; import javax.swing.*; import static java.awt.GraphicsDevice.WindowTranslucency.*; public class NotificationFrame extends javax.swing.JFrame { /** * Creates new form NotificationFrame */ public NotificationFrame() { initComponents(); this.setLayout(new GridBagLayout()); this.setUndecorated(true); this.setSize(300,200); this.setLocationRelativeTo(null); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setOpacity(0.50f); } /** * This method is called from within the constructor to initialize the form. * WARNING: Do NOT modify this code. The content of this method is always * regenerated by the Form Editor. */ @SuppressWarnings("unchecked") // <editor-fold defaultstate="collapsed" desc="Generated Code"> private void initComponents() { setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGap(0, 400, Short.MAX_VALUE) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGap(0, 300, Short.MAX_VALUE) ); pack(); }// </editor-fold> /** * @param args the command line arguments */ public static void main(String args[]) { /* Set the Nimbus look and feel */ //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) "> /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel. * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html */ try { for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) { if ("Nimbus".equals(info.getName())) { javax.swing.UIManager.setLookAndFeel(info.getClassName()); break; } } } catch (ClassNotFoundException ex) { java.util.logging.Logger.getLogger(NotificationFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (InstantiationException ex) { java.util.logging.Logger.getLogger(NotificationFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (IllegalAccessException ex) { java.util.logging.Logger.getLogger(NotificationFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (javax.swing.UnsupportedLookAndFeelException ex) { java.util.logging.Logger.getLogger(NotificationFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } //</editor-fold> /* Create and display the form */ java.awt.EventQueue.invokeLater(new Runnable() { @Override public void run() { new NotificationFrame().setVisible(true); } }); } // Variables declaration - do not modify // End of variables declaration } 

Answer 1

• +1 thanks for this chain, your code has been solved quite correctly unecorated conatiner, all about the correct order of methods (wooolaaa we returned to the edges of Java_1.4.2)

• but there is still an error, it is impossible to create a decorated JFrame with a modified Look And Feel

• based on proper ordering of methods

 import java.awt.*; import javax.swing.*; public class TranslucentWindow extends JFrame { private static final long serialVersionUID = 1L; public TranslucentWindow() { super("Test translucent window"); setLayout(new FlowLayout()); add(new JButton("test")); add(new JCheckBox("test")); add(new JRadioButton("test")); add(new JProgressBar(0, 100)); JPanel panel = new JPanel() { @Override public Dimension getPreferredSize() { return new Dimension(400, 300); } private static final long serialVersionUID = 1L; @Override protected void paintComponent(Graphics g) { super.paintComponent(g); g.setColor(Color.red); g.fillRect(0, 0, getWidth(), getHeight()); } }; panel.add(new JLabel("Very long textxxxxxxxxxxxxxxxxxxxxx ")); add(panel); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setUndecorated(true); pack(); setLocationRelativeTo(null); setOpacity(0.70f); } public static void main(String[] args) { try { for (UIManager.LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) { if ("Nimbus".equals(info.getName())) { UIManager.setLookAndFeel(info.getClassName()); break; } } } catch (Exception e) { e.printStackTrace(); } //JFrame.setDefaultLookAndFeelDecorated(true); SwingUtilities.invokeLater(new Runnable() { @Override public void run() { Window w = new TranslucentWindow(); w.setVisible(true); } }); } } 

Answer 2

The error you receive causes setUndecorated(true) after the frame becomes displayed by calling pack() . Call setUndecorated before pack , and it should work.