--- a/jdk/src/share/classes/javax/swing/MenuSelectionManager.java	Wed Apr 30 13:01:01 2008 +0400
+++ b/jdk/src/share/classes/javax/swing/MenuSelectionManager.java	Wed Apr 30 13:19:26 2008 +0400
@@ -218,9 +218,9 @@
         int selectionSize;
         p = event.getPoint();
 
-        Component source = (Component)event.getSource();
+        Component source = event.getComponent();
 
-        if (!source.isShowing()) {
+        if ((source != null) && !source.isShowing()) {
             // This can happen if a mouseReleased removes the
             // containing component -- bug 4146684
             return;
@@ -236,7 +236,9 @@
             return;
         }
 
-        SwingUtilities.convertPointToScreen(p,source);
+        if (source != null) {
+            SwingUtilities.convertPointToScreen(p, source);
+        }
 
         screenX = p.x;
         screenY = p.y;

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/javax/swing/JPopupMenu/6690791/bug6690791.java	Wed Apr 30 13:19:26 2008 +0400
@@ -0,0 +1,44 @@
+/*
+ * Copyright 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.
+ *
+ * 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 6690791
+ * @summary Checks that there is no ClassCastException
+ * in MenuSelectionManager.processMouseEvent()
+ * @author Mikhail Lapshin
+ * @run main bug6690791
+ */
+
+import javax.swing.*;
+import java.awt.event.MouseEvent;
+
+public class bug6690791 {
+    public static void main(String[] args) throws Exception {
+        MouseEvent me = new MouseEvent(new JLabel(), MouseEvent.MOUSE_CLICKED,
+                System.currentTimeMillis(), MouseEvent.ALT_MASK,
+                10, 10, 100, 100, 1, false, MouseEvent.BUTTON1);
+        me.setSource(new Object());
+        MenuSelectionManager.defaultManager().processMouseEvent(me);
+    }
+}