java.lang.ClassCastException but I'm not casting anything

[Daniel Ladebeck]

Hi

i get the exception:

Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException
	at javax.swing.LayoutComparator.compare(Unknown Source)
	at javax.swing.LayoutComparator.compare(Unknown Source)
	at java.util.TimSort.countRunAndMakeAscending(Unknown Source)
	at java.util.TimSort.sort(Unknown Source)
	at java.util.TimSort.sort(Unknown Source)
	at java.util.Arrays.sort(Unknown Source)
	at java.util.Collections.sort(Unknown Source)
	at javax.swing.SortingFocusTraversalPolicy.enumerateAndSortCycle(Unknown Source)
	at javax.swing.SortingFocusTraversalPolicy.getFocusTraversalCycle(Unknown Source)
	at javax.swing.SortingFocusTraversalPolicy.getFirstComponent(Unknown Source)
	at javax.swing.LayoutFocusTraversalPolicy.getFirstComponent(Unknown Source)
	at javax.swing.SortingFocusTraversalPolicy.getDefaultComponent(Unknown Source)
	at java.awt.FocusTraversalPolicy.getInitialComponent(Unknown Source)
	at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source)
	at java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Window.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
	at java.awt.EventQueue.access$200(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
	at java.awt.EventQueue$4.run(Unknown Source)
	at java.awt.EventQueue$4.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.SequencedEvent.dispatch(Unknown Source)
	at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
	at java.awt.EventQueue.access$200(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
	at java.awt.EventQueue$3.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
	at java.awt.EventQueue$4.run(Unknown Source)
	at java.awt.EventQueue$4.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)

my Code looks like this:

public class Test {

	public static void main(String[] args) {
		Overlay test;
		Robot r;
			Dimension screensize =java.awt.Toolkit.getDefaultToolkit().getScreenSize();
			Rectangle rect=new Rectangle(screensize);
		try {
			r = new Robot();
			System.out.println("done");
			test=new Overlay(screensize);
			test.setImg(r.createScreenCapture(rect));
			test.repaint();
			
		} catch (AWTException e) {
			e.printStackTrace();
		}
		
		
	}

}

Class Overlay:

public class Overlay extends JPanel implements KeyListener, MouseListener{


	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	Mainwindow parent;
	BufferedImage img;
	JFrame frame;
	
	public Overlay(){
	
		frame = new JFrame("Overlay");
		frame.setExtendedState(Frame.MAXIMIZED_BOTH);
		frame.setUndecorated(true);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.addKeyListener(this);
		frame.addMouseListener(this);
		frame.add(this);
		frame.setVisible(true);
		
		
	}
	public Overlay(Dimension d){
	
			JFrame frame = new JFrame("Overlay");
	//		frame.setExtendedState(Frame.MAXIMIZED_BOTH);
			frame.setSize(d);
			frame.setUndecorated(true);
			frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
			frame.addKeyListener(this);
			frame.addMouseListener(this);
			frame.add(this);
			frame.setVisible(true);
			
			
		}
	public Mainwindow getParent() {
		return parent;
	}
	public void setParent(Mainwindow parent) {
		this.parent = parent;
	}
	public void paint(Graphics g) {
		super.paint(g);
		g.drawImage(img,0,0,this);//oder this??
		super.repaint();
		
	}
	
	public void setImg(BufferedImage img){
		this.img=img;
	}
	

	@Override
	public void mouseClicked(MouseEvent arg0) {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void mouseEntered(MouseEvent arg0) {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void mouseExited(MouseEvent arg0) {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void mousePressed(MouseEvent arg0) {
		System.exit(0);
		// TODO Auto-generated method stub
		
	}

	@Override
	public void mouseReleased(MouseEvent arg0) {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void keyPressed(KeyEvent e) {
		int a = e.getKeyCode();
		if (a == KeyEvent.VK_ESCAPE) {
			System.out.println("blub3");
			System.exit(0);
		}
		// TODO Auto-generated method stub
		
	}

	@Override
	public void keyReleased(KeyEvent arg0) {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void keyTyped(KeyEvent arg0) {
		// TODO Auto-generated method stub
		
	}

}

I'm not getting any Code Line for debugging so the exception doesnt occur in my Code.
But i just cant figure out the problem.
Any one has an idea where my mistake is?

[Rob Camick]

Not sure what the problem is. After fixing the compile errors the code ran fine for me. Two things I don't like:

1) Make sure you build the GUI on the EDT
2) You don't need repaint() in the paint() method.

[Campbell Ritchie]

and welcome to the Ranch