I am trying to create JFrame using SwingUtilities
Thread tt = new Thread(new Runnable()
{
public void run()
{
try
{
SwingUtilities.invokeAndWait(new Runnable()
{
@Override
public void run()
{
new Loadingframe();
}
});
} catch (InvocationTargetException e)
{
e.printStackTrace();
} catch (InterruptedException e)
{
e.printStackTrace();
}
}
});
tt.start();
class Loadingframe is a very simple JFrame. Sometimes while running this code I get ClassCastException in
new Loadingframe();
I also tried InvokeLater and Threads only without Swing but same error too
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException
at javax.swing.LayoutComparator.compare(LayoutComparator.java:75)
at javax.swing.LayoutComparator.compare(LayoutComparator.java:42)
at java.util.TimSort.binarySort(TimSort.java:292)
at java.util.TimSort.sort(TimSort.java:217)
at java.util.Arrays.sort(Arrays.java:1512)
at java.util.ArrayList.sort(ArrayList.java:1454)
at java.util.Collections.sort(Collections.java:175)
at javax.swing.SortingFocusTraversalPolicy.enumerateAndSortCycle(SortingFocusTraversalPolicy.java:136)
at javax.swing.SortingFocusTraversalPolicy.getFocusTraversalCycle(SortingFocusTraversalPolicy.java:110)
at javax.swing.SortingFocusTraversalPolicy.getFirstComponent(SortingFocusTraversalPolicy.java:445)
at javax.swing.LayoutFocusTraversalPolicy.getFirstComponent(LayoutFocusTraversalPolicy.java:166)
at javax.swing.SortingFocusTraversalPolicy.getDefaultComponent(SortingFocusTraversalPolicy.java:535)
at java.awt.FocusTraversalPolicy.getInitialComponent(FocusTraversalPolicy.java:169)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:420)
at java.awt.Component.dispatchEventImpl(Component.java:4752)
at java.awt.Container.dispatchEventImpl(Container.java:2292)
at java.awt.Window.dispatchEventImpl(Window.java:2739)
at java.awt.Component.dispatchEvent(Component.java:4703)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:751)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:702)
at java.awt.EventQueue$3.run(EventQueue.java:696)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.awt.EventQueue$4.run(EventQueue.java:724)
at java.awt.EventQueue$4.run(EventQueue.java:722)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:721)
at java.awt.SequencedEvent.dispatch(SequencedEvent.java:128)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:749)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:702)
at java.awt.EventQueue$3.run(EventQueue.java:696)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.awt.EventQueue$4.run(EventQueue.java:724)
at java.awt.EventQueue$4.run(EventQueue.java:722)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:721)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
and for my loading class
public class Loadingframe extends JFrame
{
public Loadingframe()
{
this.setType(Type.UTILITY);
this.setUndecorated(true);
setBackground(new Color(0, 0, 0, 0));
setSize(new Dimension(500, 500));
setLocationRelativeTo(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new GridBagLayout());
JButton b = new JButton(
new ImageIcon(getClass().getResource("/reso/loading11.png")));
b.setBorderPainted(false);
b.setFocusPainted(false);
b.setContentAreaFilled(false);
add(b);
this.setVisible(true);
this.addWindowFocusListener(new WindowFocusListener()
{
@Override
public void windowLostFocus(WindowEvent e)
{
Loadingframe.this.dispose();
}
@Override
public void windowGainedFocus(WindowEvent e)
{
}
});
this.setFocusable(true);
getContentPane().requestFocus();
}
}
I see you haven't set the platform look and feel or have you ?
Like this
try { UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
} catch (Exception e) { }
Intermittent errors are sometimes caused because of the Swing components not being registered on the Componet Hierarchy that Swing maintains. Typically this happens when we are loading GUI stuff on some other thread than the EDT(Event Dispatcher Thread).
To make sure you register the components please do the following,
Thread tt = new Thread(new Runnable()
{
public void run()
{
try
{
SwingUtilities.invokeAndWait(new Runnable()
{
@Override
public void run()
{
EventQueue.invokeLater(new Runnable() { public void run() {
new Loadingframe();
}});
}
});
} catch (InvocationTargetException e)
{
e.printStackTrace();
} catch (InterruptedException e)
{
e.printStackTrace();
}
}
});