--- a/jdk/src/java.desktop/share/classes/com/sun/java/swing/plaf/motif/MotifLookAndFeel.java	Sat Jul 01 10:00:15 2017 +0530
+++ b/jdk/src/java.desktop/share/classes/com/sun/java/swing/plaf/motif/MotifLookAndFeel.java	Tue Jul 04 13:37:02 2017 +0530
@@ -1246,6 +1246,7 @@
                    "RIGHT", "selectChild",
                 "KP_RIGHT", "selectChild",
                    "ENTER", "return",
+                   "ctrl ENTER", "return",
                    "SPACE", "return"
             },
 

--- a/jdk/src/java.desktop/share/classes/javax/swing/plaf/synth/SynthLookAndFeel.java	Sat Jul 01 10:00:15 2017 +0530
+++ b/jdk/src/java.desktop/share/classes/javax/swing/plaf/synth/SynthLookAndFeel.java	Tue Jul 04 13:37:02 2017 +0530
@@ -683,6 +683,7 @@
                    "RIGHT", "selectChild",
                 "KP_RIGHT", "selectChild",
                    "ENTER", "return",
+                   "ctrl ENTER", "return",
                    "SPACE", "return"
         });
         table.put("PopupMenu.selectedWindowInputMapBindings.RightToLeft",

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/javax/swing/JPopupMenu/4870644/bug4870644.java	Tue Jul 04 13:37:02 2017 +0530
@@ -0,0 +1,162 @@
+/*
+ * Copyright (c) 2017, 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.
+ */
+/*
+ * @test
+ * @key headful
+ * @bug 4870644 7190539
+ * @summary  Default button responds to CTRL-ENTER while popup menu is active.
+ * @run main bug4870644
+ */
+import java.awt.BorderLayout;
+import java.awt.Dimension;
+import java.awt.Point;
+import java.awt.Robot;
+import java.awt.event.KeyEvent;
+import java.awt.event.ActionEvent;
+import java.awt.event.InputEvent;
+import javax.swing.AbstractAction;
+import javax.swing.JButton;
+import javax.swing.JComponent;
+import javax.swing.JFrame;
+import javax.swing.JMenu;
+import javax.swing.JMenuBar;
+import javax.swing.JMenuItem;
+import javax.swing.JPopupMenu;
+import javax.swing.SwingUtilities;
+import javax.swing.UIManager;
+import javax.swing.UnsupportedLookAndFeelException;
+
+
+public class bug4870644 {
+    JButton b1, b2, b3;
+    JFrame frame;
+    JMenu menu;
+    JPopupMenu popup;
+    static Robot robot;
+    static boolean passed = true;
+    private volatile Point p = null;
+    private volatile Dimension d = null;
+    void blockTillDisplayed(JComponent comp) throws Exception {
+        while (p == null) {
+            try {
+                SwingUtilities.invokeAndWait(() -> {
+                    p = comp.getLocationOnScreen();
+                    d = comp.getSize();
+                });
+            } catch (IllegalStateException e) {
+                try {
+                    Thread.sleep(1000);
+                } catch (InterruptedException ie) {
+                }
+            }
+        }
+    }
+
+    private static void setLookAndFeel(final UIManager.LookAndFeelInfo laf) {
+        try {
+            UIManager.setLookAndFeel(laf.getClassName());
+            System.out.println("LookAndFeel: " + laf.getClassName());
+        } catch (ClassNotFoundException | InstantiationException |
+                UnsupportedLookAndFeelException | IllegalAccessException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public static void main(String[] args) throws Exception {
+        robot = new Robot();
+        robot.setAutoDelay(100);
+        for (UIManager.LookAndFeelInfo laf : UIManager.getInstalledLookAndFeels()) {
+            try {
+                SwingUtilities.invokeAndWait(() -> setLookAndFeel(laf));
+                System.out.println("Test for LookAndFeel " + laf.getClassName());
+                new bug4870644();
+                System.out.println("Test passed for LookAndFeel " + laf.getClassName());
+            } catch (Exception e) {
+                throw new RuntimeException(e);
+            }
+        }
+    }
+
+    public bug4870644() throws Exception {
+
+        SwingUtilities.invokeAndWait(() -> {
+            JMenuBar menuBar = new JMenuBar();
+            menu = new JMenu("Menu");
+            menuBar.add(menu);
+            JMenuItem menuItem = new JMenuItem("Item");
+            menu.add(menuItem);
+            menu.add(new JMenuItem("Item 2"));
+            frame = new JFrame("test");
+            frame.setJMenuBar(menuBar);
+
+            b1 = new JButton("One");
+            b2 = new JButton("Two");
+            b3 = new JButton("Default");
+            b3.addActionListener(new AbstractAction() {
+                public void actionPerformed(ActionEvent e) {
+                    passed = false;
+                }
+            });
+            frame.getContentPane().add(b1, BorderLayout.NORTH);
+            frame.getContentPane().add(b2, BorderLayout.CENTER);
+            frame.getContentPane().add(b3, BorderLayout.SOUTH);
+            frame.getRootPane().setDefaultButton(b3);
+            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+            frame.pack();
+            frame.setVisible(true);
+        });
+
+        blockTillDisplayed(b1);
+        robot.waitForIdle();
+
+        robot.delay(500);
+        robot.mouseMove(p.x + d.width-1, p.y + d.height/2);
+        robot.mousePress(InputEvent.BUTTON1_MASK);
+        robot.mouseRelease(InputEvent.BUTTON1_MASK);
+        robot.waitForIdle();
+        robot.keyPress(KeyEvent.VK_F10);
+        robot.keyRelease(KeyEvent.VK_F10);
+        robot.keyPress(KeyEvent.VK_DOWN);
+        robot.keyRelease(KeyEvent.VK_DOWN);
+        robot.waitForIdle();
+
+        SwingUtilities.invokeAndWait(() -> {
+            popup = menu.getPopupMenu();
+        });
+
+        blockTillDisplayed(popup);
+        robot.waitForIdle();
+        robot.mouseMove(p.x + d.width-1, p.y + d.height/2);
+        robot.keyPress(KeyEvent.VK_CONTROL);
+        robot.keyPress(KeyEvent.VK_ENTER);
+        robot.keyRelease(KeyEvent.VK_ENTER);
+        robot.keyRelease(KeyEvent.VK_CONTROL);
+        robot.waitForIdle();
+
+        SwingUtilities.invokeAndWait(() -> frame.dispose());
+        if(!passed) {
+            String cause = "Default button reacted on \"ctrl ENTER\" while menu is active.";
+            throw new RuntimeException(cause);
+        }
+    }
+}