--- a/jdk/src/java.desktop/share/classes/java/awt/Container.java	Fri May 22 15:19:05 2015 +0400
+++ b/jdk/src/java.desktop/share/classes/java/awt/Container.java	Fri May 22 15:27:28 2015 +0400
@@ -4420,6 +4420,18 @@
 
     private static final PlatformLogger eventLog = PlatformLogger.getLogger("java.awt.event.LightweightDispatcher");
 
+    private static final int BUTTONS_DOWN_MASK;
+
+    static {
+        int[] buttonsDownMask = AWTAccessor.getInputEventAccessor().
+                getButtonDownMasks();
+        int mask = 0;
+        for (int buttonDownMask : buttonsDownMask) {
+            mask |= buttonDownMask;
+        }
+        BUTTONS_DOWN_MASK = mask;
+    }
+
     LightweightDispatcher(Container nativeContainer) {
         this.nativeContainer = nativeContainer;
         mouseEventTarget = new WeakReference<>(null);
@@ -4488,25 +4500,12 @@
     private boolean isMouseGrab(MouseEvent e) {
         int modifiers = e.getModifiersEx();
 
-        if(e.getID() == MouseEvent.MOUSE_PRESSED
-            || e.getID() == MouseEvent.MOUSE_RELEASED)
-        {
-            switch (e.getButton()) {
-            case MouseEvent.BUTTON1:
-                modifiers ^= InputEvent.BUTTON1_DOWN_MASK;
-                break;
-            case MouseEvent.BUTTON2:
-                modifiers ^= InputEvent.BUTTON2_DOWN_MASK;
-                break;
-            case MouseEvent.BUTTON3:
-                modifiers ^= InputEvent.BUTTON3_DOWN_MASK;
-                break;
-            }
+        if (e.getID() == MouseEvent.MOUSE_PRESSED
+                || e.getID() == MouseEvent.MOUSE_RELEASED) {
+            modifiers ^= InputEvent.getMaskForButton(e.getButton());
         }
         /* modifiers now as just before event */
-        return ((modifiers & (InputEvent.BUTTON1_DOWN_MASK
-                              | InputEvent.BUTTON2_DOWN_MASK
-                              | InputEvent.BUTTON3_DOWN_MASK)) != 0);
+        return ((modifiers & BUTTONS_DOWN_MASK) != 0);
     }
 
     /**

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/awt/Mouse/MouseDragEvent/MouseDraggedTest.java	Fri May 22 15:27:28 2015 +0400
@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2015, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+import java.awt.*;
+import java.awt.event.*;
+import javax.swing.*;
+/*
+ * @test
+ * @bug 8080137
+ * @summary Dragged events for extra mouse buttons (4,5,6) are not generated
+ *            on JSplitPane
+ * @author alexandr.scherbatiy area=awt.event
+ * @run main MouseDraggedTest
+ */
+public class MouseDraggedTest {
+
+    private static JFrame frame;
+    private static Rectangle frameBounds;
+    private static volatile boolean mouseDragged;
+
+    public static void main(String[] args) throws Exception {
+        try {
+            Robot robot = new Robot();
+            robot.setAutoDelay(50);
+
+            SwingUtilities.invokeAndWait(MouseDraggedTest::createAndShowGUI);
+            robot.waitForIdle();
+
+            SwingUtilities.invokeAndWait(() -> frameBounds = frame.getBounds());
+            robot.waitForIdle();
+
+            for (int i = 1; i <= MouseInfo.getNumberOfButtons(); i++) {
+                testMouseDrag(i, robot);
+            }
+        } finally {
+            SwingUtilities.invokeLater(() -> {
+                if (frame != null) {
+                    frame.dispose();
+                }
+            });
+        }
+    }
+
+    private static void testMouseDrag(int button, Robot robot) {
+
+        mouseDragged = false;
+        int x1 = frameBounds.x + frameBounds.width / 4;
+        int y1 = frameBounds.y + frameBounds.height / 4;
+        int x2 = frameBounds.x + frameBounds.width / 2;
+        int y2 = frameBounds.y + frameBounds.height / 2;
+
+        robot.mouseMove(x1, y1);
+        robot.waitForIdle();
+
+        int buttonMask = InputEvent.getMaskForButton(button);
+        robot.mousePress(buttonMask);
+        robot.mouseMove(x2, y2);
+        robot.mouseRelease(buttonMask);
+        robot.waitForIdle();
+
+        if (!mouseDragged) {
+            throw new RuntimeException("Mouse button " + button
+                    + " is not dragged");
+        }
+    }
+
+    static void createAndShowGUI() {
+
+        frame = new JFrame();
+        frame.setSize(400, 400);
+        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        JPanel panel = new JPanel(new BorderLayout());
+        panel.addMouseMotionListener(new MouseAdapter() {
+
+            @Override
+            public void mouseDragged(MouseEvent e) {
+                mouseDragged = true;
+            }
+        });
+        frame.add(panel, BorderLayout.CENTER);
+        frame.setVisible(true);
+    }
+}
\ No newline at end of file