--- a/jdk/src/share/classes/javax/swing/JLayer.java	Mon Aug 31 13:56:34 2009 +0400
+++ b/jdk/src/share/classes/javax/swing/JLayer.java	Mon Aug 31 18:39:41 2009 +0400
@@ -408,7 +408,10 @@
         if (layerEventMask != oldEventMask) {
             disableEvents(oldEventMask);
             enableEvents(eventMask);
-            eventController.updateAWTEventListener(this);
+            if (isDisplayable()) {
+                eventController.updateAWTEventListener(
+                        oldEventMask, layerEventMask);
+            }
         }
     }
 
@@ -549,20 +552,30 @@
     private void readObject(ObjectInputStream s)
             throws IOException, ClassNotFoundException {
         s.defaultReadObject();
-        if (getUI() != null) {
-            setUI(getUI());
+        if (layerUI != null) {
+            setUI(layerUI);
+        }
+        if (eventMask != 0) {
+            eventController.updateAWTEventListener(0, eventMask);
         }
-        if (getLayerEventMask() != 0) {
-            eventController.updateAWTEventListener(this);
-        }
+    }
+
+    public void addNotify() {
+        eventController.updateAWTEventListener(0, eventMask);
+        super.addNotify();
+    }
+
+    public void removeNotify() {
+        eventController.updateAWTEventListener(eventMask, 0);
+        super.removeNotify();
     }
 
     /**
      * static AWTEventListener to be shared with all AbstractLayerUIs
      */
     private static class LayerEventController implements AWTEventListener {
-        private ArrayList<WeakReference<JLayer>> layerList =
-                new ArrayList<WeakReference<JLayer>>();
+        private ArrayList<Long> layerMaskList =
+                new ArrayList<Long>();
 
         private long currentEventMask;
 
@@ -586,37 +599,24 @@
             }
         }
 
-        private boolean layerListContains(JLayer l) {
-            for (WeakReference<JLayer> layerWeakReference : layerList) {
-                if (layerWeakReference.get() == l) {
-                    return true;
-                }
+        private void updateAWTEventListener(long oldEventMask, long newEventMask) {
+            if (oldEventMask != 0) {
+                layerMaskList.remove(oldEventMask);
             }
-            return false;
-        }
-
-        private void updateAWTEventListener(JLayer layer) {
-            if (!layerListContains(layer) && layer.getLayerEventMask() != 0) {
-                layerList.add(new WeakReference<JLayer>(layer));
+            if (newEventMask != 0) {
+                layerMaskList.add(newEventMask);
             }
             long combinedMask = 0;
-            Iterator<WeakReference<JLayer>> it = layerList.iterator();
-            while (it.hasNext()) {
-                WeakReference<JLayer> weakRef = it.next();
-                JLayer currLayer = weakRef.get();
-                if (currLayer == null) {
-                    it.remove();
-                } else {
-                    combinedMask |= currLayer.getLayerEventMask();
-                }
+            for (Long mask : layerMaskList) {
+                combinedMask |= mask;
             }
             if (combinedMask == 0) {
                 removeAWTEventListener();
-                layerList.clear();
             } else if (getCurrentEventMask() != combinedMask) {
                 removeAWTEventListener();
                 addAWTEventListener(combinedMask);
             }
+            currentEventMask = combinedMask;
         }
 
         private long getCurrentEventMask() {
@@ -631,7 +631,7 @@
                     return null;
                 }
             });
-            currentEventMask = eventMask;
+
         }
 
         private void removeAWTEventListener() {
@@ -642,7 +642,6 @@
                     return null;
                 }
             });
-            currentEventMask = 0;
         }
 
         private boolean isEventEnabled(long eventMask, int id) {

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/javax/swing/JLayer/6872503/bug6872503.java	Mon Aug 31 18:39:41 2009 +0400
@@ -0,0 +1,135 @@
+/*
+ * Copyright 2009 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/* @test
+ * @bug 6872503
+ * @summary Checks that JLayer correctly works with its AWTEventListener
+ * @author Alexander Potochkin
+ */
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.AWTEventListener;
+import java.awt.event.AWTEventListenerProxy;
+
+public class bug6872503 {
+
+    static JLayer<Component> l1;
+    static JLayer<Component> l2;
+
+    private static void createGui() {
+        Toolkit toolkit = Toolkit.getDefaultToolkit();
+        int length = toolkit.getAWTEventListeners().length;
+
+        l1 = new JLayer<Component>();
+        l1.setLayerEventMask(AWTEvent.MOUSE_EVENT_MASK | AWTEvent.FOCUS_EVENT_MASK);
+
+        l2 = new JLayer<Component>();
+        l2.setLayerEventMask(AWTEvent.MOUSE_EVENT_MASK | AWTEvent.KEY_EVENT_MASK);
+
+        if (isLayerEventControllerAdded()) {
+            throw new RuntimeException("Unexpected AWTEventListener was added");
+        }
+
+        JFrame frame = new JFrame();
+        frame.setLayout(new FlowLayout());
+        frame.add(l1);
+        frame.add(l2);
+
+        if (isLayerEventControllerAdded()) {
+            throw new RuntimeException("Unexpected AWTEventListener was added");
+        }
+
+        frame.pack();
+
+        if (!isLayerEventControllerAdded()) {
+            throw new RuntimeException("AWTEventListener was not added");
+        }
+
+        if (!layerEventControllerMaskEquals(l1.getLayerEventMask() | l2.getLayerEventMask())) {
+             throw new RuntimeException("Wrong mask for AWTEventListener");
+        }
+
+        frame.dispose();
+
+        if (isLayerEventControllerAdded()) {
+            throw new RuntimeException("Unexpected AWTEventListener was added");
+        }
+    }
+
+    static boolean isLayerEventControllerAdded() {
+        Toolkit toolkit = Toolkit.getDefaultToolkit();
+        AWTEventListener layerEventController = null;
+        for (AWTEventListener listener : toolkit.getAWTEventListeners()) {
+            if (listener instanceof AWTEventListenerProxy) {
+                listener = ((AWTEventListenerProxy)listener).getListener();
+
+            }
+            if ("LayerEventController".equals(listener.getClass().getSimpleName())) {
+                if (layerEventController != null) {
+                    throw new RuntimeException("Duplicated LayerEventController");
+                }
+                layerEventController = listener;
+            }
+        }
+        boolean ret = layerEventController != null;
+        if (ret) {
+            System.out.println("LayerEventController found");
+        } else {
+            System.out.println("No LayerEventController");
+        }
+        return ret;
+    }
+
+    static boolean layerEventControllerMaskEquals(long mask) {
+        Toolkit toolkit = Toolkit.getDefaultToolkit();
+        AWTEventListener layerEventController = null;
+        for (AWTEventListener listener : toolkit.getAWTEventListeners(mask)) {
+            if (listener instanceof AWTEventListenerProxy) {
+                listener = ((AWTEventListenerProxy)listener).getListener();
+
+            }
+            if ("LayerEventController".equals(listener.getClass().getSimpleName())) {
+                if (layerEventController != null) {
+                    throw new RuntimeException("Duplicated LayerEventController");
+                }
+                layerEventController = listener;
+            }
+        }
+        boolean ret = layerEventController != null;
+        if (ret) {
+            System.out.println("LayerEventController with the correct mask found");
+        } else {
+            System.out.println("No LayerEventController with the correct mask");
+        }
+        return ret;
+    }
+
+    public static void main(String[] args) throws Exception {
+        SwingUtilities.invokeAndWait(new Runnable() {
+            public void run() {
+                bug6872503.createGui();
+            }
+        });
+    }
+}