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diff --git a/src/javax/media/j3d/NotificationThread.java b/src/javax/media/j3d/NotificationThread.java
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+/*
+ * Copyright 2005-2008 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.  Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun in the LICENSE file that accompanied this code.
+ *
+ * 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.
+ *
+ */
+
+package javax.media.j3d;
+
+import java.util.ArrayList;
+
+/**
+ * The NotificationThread class is used for asynchronous error notification,
+ * such as notifying ShaderError listeners.
+ */
+class NotificationThread extends Thread {
+    // action flag for runMonitor
+    private static final int WAIT   = 0;
+    private static final int NOTIFY = 1;
+    private static final int STOP   = 2;
+
+    private volatile boolean running = true;
+    private boolean waiting = false;
+    private boolean ready = false;
+
+    private ArrayList<J3dNotification> notificationQueue = new ArrayList<J3dNotification>();
+
+    /**
+     * Creates a new instance of NotificationThread
+     */
+    NotificationThread(ThreadGroup t) {
+        // Only one notification thread for the entire system
+	super(t, "J3D-NotificationThread");
+    }
+
+    /**
+     * Adds a notification message to the queue
+     */
+    synchronized void addNotification(J3dNotification n) {
+        notificationQueue.add(n);
+        runMonitor(NOTIFY);
+    }
+
+    /**
+     * Gets the list of queued notification messages
+     */
+    private synchronized J3dNotification[] getNotifications() {
+        J3dNotification[] n = new J3dNotification[notificationQueue.size()];
+        n = notificationQueue.toArray(n);
+        notificationQueue.clear();
+        return n;
+    }
+
+    /**
+     * Processes all pending notification messages
+     */
+    private void processNotifications() {
+        J3dNotification[] notifications = getNotifications();
+
+        for (int i = 0; i < notifications.length; i++) {
+            J3dNotification n = notifications[i];
+            switch (n.type) {
+            case J3dNotification.SHADER_ERROR:
+                n.universe.notifyShaderErrorListeners((ShaderError)n.args[0]);
+                break;
+            case J3dNotification.RENDERING_ERROR:
+                VirtualUniverse.notifyRenderingErrorListeners((RenderingError)n.args[0]);
+                break;
+            default:
+                System.err.println("J3dNotification.processNotifications: unrecognized type = " + n.type);
+            }
+        }
+    }
+
+    // Called from MasterControlThread
+    void finish() {
+	runMonitor(STOP);
+    }
+
+    @Override
+    public void run() {
+	while (running) {
+	    runMonitor(WAIT);
+
+            processNotifications();
+	}
+//        System.err.println("Notification thread finished");
+    }
+
+
+    private synchronized void runMonitor(int action) {
+        switch (action) {
+        case WAIT:
+            while (running && !ready) {
+                waiting = true;
+                try {
+                    wait();
+                } catch (InterruptedException e) {
+                }
+                waiting = false;
+            }
+            ready = false;
+            break;
+        case NOTIFY:
+            ready = true;
+            if (waiting) {
+                notify();
+            }
+            break;
+        case STOP:
+            running = false;
+            notify();
+            break;
+        default:
+            // Should never get here...
+            assert(false);
+        }
+    }
+
+}