Under JDK 1.4 rc2 I got following thread dump showing deadlock. The same code
works well under JDK 1.3.

Original: http://xml.netbeans.org/issues/show_bug.cgi?id=17992

This thread showed modal customizer dialog.

"org.netbeans.core.ModuleActions-3" daemon prio=1 tid=0x0x84f43a8 nid=0x55ca waiting on monitor [bcfff000..bcfff8ac]
        at java.lang.Object.wait(Native Method)
        - waiting on <0x44260300> (a java.awt.EventQueue$1$AWTInvocationLock)
        at java.lang.Object.wait(Object.java:429)
        at java.awt.EventQueue.invokeAndWait(EventQueue.java:797)
        - locked <0x44260300> (a java.awt.EventQueue$1$AWTInvocationLock)
        at org.openide.util.Mutex.doEventAccess(Mutex.java:933)
        at org.openide.util.Mutex.readAccess(Mutex.java:162)
        at org.netbeans.core.NbNodeOperation.customize(NbNodeOperation.java:126)
        at org.openide.actions.CustomizeAction$CustomizationInvoker.run(CustomizeAction.java:116)
        at org.openide.actions.CustomizeAction.performAction(CustomizeAction.java:44)
        at org.openide.util.actions.NodeAction.performAction(NodeAction.java:180)
        at org.openide.util.actions.NodeAction.actionPerformed(NodeAction.java:171)
        at org.netbeans.core.ModuleActions$1.run(ModuleActions.java:105)
        at org.openide.util.Task.run(Task.java:152)
        at org.openide.util.RequestProcessor$ProcessorThread.run(RequestProcessor.java:622)


The customizer dialog want to show a modal dialog:

"AWT-EventQueue-0" prio=1 tid=0x0x823f200 nid=0x558b waiting on monitor [bdffd000..bdfff8ac]
        at java.lang.Object.wait(Native Method)
        - waiting on <0x448b3340> (a java.awt.EventQueue)
        at java.lang.Object.wait(Object.java:429)
        at java.awt.EventQueue.getNextEvent(EventQueue.java:364)
        - locked <0x448b3340> (a java.awt.EventQueue)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:158)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:147)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:141)
        at java.awt.SequencedEvent.dispatch(SequencedEvent.java:75)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:446)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:193)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:147)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:137)
        at java.awt.Dialog.show(Dialog.java:527)
        at org.netbeans.core.NbPresenter.superShow(NbPresenter.java:589)
        at org.netbeans.core.NbPresenter.run(NbPresenter.java:612)
        at org.openide.util.Mutex.doEventAccess(Mutex.java:922)
        at org.openide.util.Mutex.readAccess(Mutex.java:162)
        at org.netbeans.core.NbPresenter.show(NbPresenter.java:593)
        at java.awt.Component.show(Component.java:1131)
        at java.awt.Component.setVisible(Component.java:1086)
        at org.netbeans.core.NbTopManager$2.run(NbTopManager.java:524)
        at org.openide.util.Mutex.doEventAccess(Mutex.java:922)
        at org.openide.util.Mutex.readAccess(Mutex.java:162)
        at org.netbeans.core.NbTopManager.notify(NbTopManager.java:503)
        at org.netbeans.modules.xml.tax.AbstractUtil.notifyWarning(AbstractUtil.java:96)
        at org.netbeans.modules.xml.tax.AbstractUtil.notifyTreeException(AbstractUtil.java:89)
        at org.netbeans.modules.xml.tax.beans.customizer.TreeAttlistDeclAttributeDefCustomizer.updateAttributeDefEnumeratedType(TreeAttlistDeclAttributeDefCustomizer.java:13)
        at org.netbeans.modules.xml.tax.beans.customizer.TreeAttlistDeclAttributeDefCustomizer.enumeratedFieldFocusLost(TreeAttlistDeclAttributeDefCustomizer.java:441)
        at org.netbeans.modules.xml.tax.beans.customizer.TreeAttlistDeclAttributeDefCustomizer.access$500(TreeAttlistDeclAttributeDefCustomizer.java:25)
        at org.netbeans.modules.xml.tax.beans.customizer.TreeAttlistDeclAttributeDefCustomizer$6.focusLost(TreeAttlistDeclAttributeDefCustomizer.java:327)
        at java.awt.AWTEventMulticaster.focusLost(AWTEventMulticaster.java:171)
        at java.awt.Component.processFocusEvent(Component.java:4930)
        at java.awt.Component.processEvent(Component.java:4812)
        at java.awt.Container.processEvent(Container.java:1383)
        at java.awt.Component.dispatchEventImpl(Component.java:3529)
        at java.awt.Container.dispatchEventImpl(Container.java:1440)
        at java.awt.Component.dispatchEvent(Component.java:3370)
        at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1703)
        at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:712)
        at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:445)
        at java.awt.Component.dispatchEventImpl(Component.java:3399)
        at java.awt.Container.dispatchEventImpl(Container.java:1440)
        at java.awt.Component.dispatchEvent(Component.java:3370)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:448)
        at java.awt.SentEvent.dispatch(SentEvent.java:53)
        at java.awt.DefaultKeyboardFocusManager$DefaultKeyboardFocusManagerSentEvent.dispatch(DefaultKeyboardFocusManager.java:143)
        at java.awt.DefaultKeyboardFocusManager.sendMessage(DefaultKeyboardFocusManager.java:167)
        at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:497)
        at java.awt.Component.dispatchEventImpl(Component.java:3399)
        at java.awt.Container.dispatchEventImpl(Container.java:1440)
        at java.awt.Window.dispatchEventImpl(Window.java:1569)
        at java.awt.Component.dispatchEvent(Component.java:3370)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:448)
        at java.awt.SentEvent.dispatch(SentEvent.java:53)
        at java.awt.DefaultKeyboardFocusManager$DefaultKeyboardFocusManagerSentEvent.dispatch(DefaultKeyboardFocusManager.java:143)
        at java.awt.DefaultKeyboardFocusManager.sendMessage(DefaultKeyboardFocusManager.java:167)
        at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:223)
        at java.awt.Component.dispatchEventImpl(Component.java:3399)
        at java.awt.Container.dispatchEventImpl(Container.java:1440)
        at java.awt.Window.dispatchEventImpl(Window.java:1569)
        at java.awt.Component.dispatchEvent(Component.java:3370)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:448)
        at java.awt.SequencedEvent.dispatch(SequencedEvent.java:108)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:446)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:193)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:147)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:137)
        at java.awt.Dialog.show(Dialog.java:527)
        at org.netbeans.core.NbPresenter.superShow(NbPresenter.java:589)
        at org.netbeans.core.NbPresenter.run(NbPresenter.java:612)
        at org.openide.util.Mutex.doEventAccess(Mutex.java:922)
        at org.openide.util.Mutex.readAccess(Mutex.java:162)
        at org.netbeans.core.NbPresenter.show(NbPresenter.java:593)
        at java.awt.Component.show(Component.java:1131)
        at java.awt.Component.setVisible(Component.java:1086)
        at org.netbeans.core.NbTopManager$2.run(NbTopManager.java:524)
        at org.openide.util.Mutex.doEventAccess(Mutex.java:922)
        at org.openide.util.Mutex.readAccess(Mutex.java:162)
        at org.netbeans.core.NbTopManager.notify(NbTopManager.java:503)
        at org.netbeans.modules.xml.tax.AbstractUtil.notifyWarning(AbstractUtil.java:96)
        at org.netbeans.modules.xml.tax.AbstractUtil.notifyTreeException(AbstractUtil.java:89)
        at org.netbeans.modules.xml.tax.beans.customizer.TreeAttlistDeclAttributeDefCustomizer.updateAttributeDefType(TreeAttlistDeclAttributeDefCustomizer.java:118)
        at org.netbeans.modules.xml.tax.beans.customizer.TreeAttlistDeclAttributeDefCustomizer.typeFieldFocusLost(TreeAttlistDeclAttributeDefCustomizer.java:446)
        at org.netbeans.modules.xml.tax.beans.customizer.TreeAttlistDeclAttributeDefCustomizer.access$300(TreeAttlistDeclAttributeDefCustomizer.java:25)
        at org.netbeans.modules.xml.tax.beans.customizer.TreeAttlistDeclAttributeDefCustomizer$4.focusLost(TreeAttlistDeclAttributeDefCustomizer.java:296)
        at java.awt.AWTEventMulticaster.focusLost(AWTEventMulticaster.java:171)
        at java.awt.Component.processFocusEvent(Component.java:4930)
        at java.awt.Component.processEvent(Component.java:4812)
        at java.awt.Container.processEvent(Container.java:1383)
        at java.awt.Component.dispatchEventImpl(Component.java:3529)
        at java.awt.Container.dispatchEventImpl(Container.java:1440)
        at java.awt.Component.dispatchEvent(Component.java:3370)
        at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1703)
        at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:712)
        at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:445)
        at java.awt.Component.dispatchEventImpl(Component.java:3399)
        at java.awt.Container.dispatchEventImpl(Container.java:1440)
        at java.awt.Component.dispatchEvent(Component.java:3370)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:448)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:193)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:147)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:137)
        at java.awt.Dialog.show(Dialog.java:527)
        at org.netbeans.core.NbPresenter.superShow(NbPresenter.java:589)
        at org.netbeans.core.NbPresenter.run(NbPresenter.java:612)
        at org.openide.util.Mutex.doEventAccess(Mutex.java:922)
        at org.openide.util.Mutex.readAccess(Mutex.java:162)
        at org.netbeans.core.NbPresenter.show(NbPresenter.java:593)
        at org.netbeans.core.NbNodeOperation$2.run(NbNodeOperation.java:146)
        at org.openide.util.Mutex$1.run(Mutex.java:936)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:174)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:446)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:193)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:147)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:141)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:133)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:101)


###@###.### 2001-11-28

It sounds to be focus related when showing a dilaog from focusLost(). The dialog is not shown properly. (May be it want to call back another focus lost.) A simple case attached.

=============================================================

Here is the test case from the attachments.
I commented out the package statement.

/*
 * Sun Public License Notice
 *
 * The contents of this file are subject to the Sun Public License
 * Version 1.0 (the "License"). You may not use this file except in
 * compliance with the License. A copy of the License is available at
 * http://www.sun.com/
 *
 * The Original Code is NetBeans. The Initial Developer of the Original
 * Code is Sun Microsystems, Inc. Portions Copyright 1997-2001 Sun
 * Microsystems, Inc. All Rights Reserved.
 */

// package bt4531.s693;

import java.awt.*;

import javax.swing.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.FocusAdapter;
import java.awt.event.FocusEvent;

/**
 * Test that under JDK 1.4 b87 crashes as the second dialog is not
 * shown properly. It works fine under JDK 1.3.
 * <p>
 * It sounds that it is focus related as I was not able to reproduce it
 * on a mouse event.
 *
 * @author Petr Kuzel
 */
public class DialogTest {

    /** Creates a new instance of DialogTest */
    public DialogTest() {
    }

    /**
    * @param args the command line arguments
    */
    public static void main (String args[]) throws Exception {

        final JFrame f = new JFrame("Test 4531693");
        f.setSize(300, 300);
        f.show();
        
        SwingUtilities.invokeAndWait( new Runnable() {
            public void run() {
                JDialog d = new XDialog(f, "L1 dialog", true);
                d.setSize(200,200);
                d.getContentPane().add(new JLabel("L1 dialog"));
                d.show();
            }
        });
        
        System.err.println("Done");
        System.exit(0); //kill AWT thread
    }

    private static class XDialog extends JDialog {
        
        private final Frame f;
        
        public XDialog(Frame f, String t, boolean b) {
            super(f, t, b);
            this.f = f;
        }
        
        public void show() {

            addFocusListener(new FocusAdapter() {
                public void focusLost(FocusEvent e) {
                    JDialog d = new JDialog(XDialog.this, "L2 dialog", true);
                    d.setSize(100, 100);
                    d.getContentPane().add(new JLabel("L2 dialog"));
                    d.show();
                }
                
            });
            
            super.show();
            
        }
    }
}


###@###.### 2001-11-29



###@###.### 2002-03-19
------------------------------

CAP member had reported the same problem and this problem is serious enough
that they might have to move back to 1.3.1.

Their EventQueue got stuck, resulting in an application that wont redraw nor
respond to the user but that is otherwise alive. Attached their stack trace:

"AWT-EventQueue-0" prio=7 tid=0x0ABD1BB0 nid=0x8d8 waiting on monitor
[afdf000..afdfdb4]
        at java.lang.Object.wait(Native Method)
        - waiting on <02F3C498> (a java.awt.EventQueue)
        at java.lang.Object.wait(Object.java:426)
        at java.awt.EventQueue.getNextEvent(EventQueue.java:329)
        - locked <02F3C498> (a java.awt.EventQueue)
        at
java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.ja
va:155)
        at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java
:144)
        at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
        at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:130)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:98)


They have had this happen even when modal dialogs are not involved.