--- a/jdk/src/share/classes/javax/swing/text/LayoutQueue.java	Thu Jan 29 19:06:29 2009 +0300
+++ b/jdk/src/share/classes/javax/swing/text/LayoutQueue.java	Wed Feb 04 18:48:24 2009 +0300
@@ -25,6 +25,7 @@
 package javax.swing.text;
 
 import java.util.Vector;
+import sun.awt.AppContext;
 
 /**
  * A queue of text layout tasks.
@@ -35,10 +36,10 @@
  */
 public class LayoutQueue {
 
-    Vector<Runnable> tasks;
-    Thread worker;
+    private static final Object DEFAULT_QUEUE = new Object();
 
-    static LayoutQueue defaultQueue;
+    private Vector<Runnable> tasks;
+    private Thread worker;
 
     /**
      * Construct a layout queue.
@@ -51,19 +52,31 @@
      * Fetch the default layout queue.
      */
     public static LayoutQueue getDefaultQueue() {
-        if (defaultQueue == null) {
-            defaultQueue = new LayoutQueue();
+        AppContext ac = AppContext.getAppContext();
+        synchronized (DEFAULT_QUEUE) {
+            LayoutQueue defaultQueue = (LayoutQueue) ac.get(DEFAULT_QUEUE);
+            if (defaultQueue == null) {
+                defaultQueue = new LayoutQueue();
+                ac.put(DEFAULT_QUEUE, defaultQueue);
+            }
+            return defaultQueue;
         }
-        return defaultQueue;
     }
 
     /**
      * Set the default layout queue.
      *
-     * @param q the new queue.
+     * @param defaultQueue the new queue.
      */
-    public static void setDefaultQueue(LayoutQueue q) {
-        defaultQueue = q;
+    public static void setDefaultQueue(LayoutQueue defaultQueue) {
+        synchronized (DEFAULT_QUEUE) {
+            AppContext ac = AppContext.getAppContext();
+            if (defaultQueue == null) {
+                ac.remove(DEFAULT_QUEUE);
+            } else {
+                ac.put(DEFAULT_QUEUE, defaultQueue);
+            }
+        }
     }
 
     /**

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/javax/swing/text/LayoutQueue/Test6588003.java	Wed Feb 04 18:48:24 2009 +0300
@@ -0,0 +1,59 @@
+/*
+ * Copyright 2007 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 6588003
+   @summary LayoutQueue should not share its DefaultQueue across AppContexts
+   @author Peter Zhelezniakov
+   @run main Test6588003
+*/
+
+import javax.swing.text.LayoutQueue;
+import sun.awt.SunToolkit;
+
+public class Test6588003 implements Runnable {
+    private static final LayoutQueue DEFAULT = new LayoutQueue();
+
+    public static void main(String[] args) throws InterruptedException {
+        LayoutQueue.setDefaultQueue(DEFAULT);
+
+        ThreadGroup group = new ThreadGroup("Test6588003");
+        Thread thread = new Thread(group, new Test6588003());
+        thread.start();
+        thread.join();
+
+        if (LayoutQueue.getDefaultQueue() != DEFAULT) {
+            throw new RuntimeException("Sharing detected");
+        }
+    }
+
+    public void run() {
+        SunToolkit.createNewAppContext();
+
+        if (LayoutQueue.getDefaultQueue() == DEFAULT) {
+            throw new RuntimeException("Sharing detected");
+        }
+
+        LayoutQueue.setDefaultQueue(new LayoutQueue());
+    }
+}