--- a/jdk/src/java.desktop/share/classes/javax/swing/ToolTipManager.java	Tue Dec 16 19:46:22 2014 +0000
+++ b/jdk/src/java.desktop/share/classes/javax/swing/ToolTipManager.java	Wed Dec 17 14:58:58 2014 +0300
@@ -28,6 +28,7 @@
 
 import java.awt.event.*;
 import java.awt.*;
+import java.util.Objects;
 
 /**
  * Manages all the <code>ToolTips</code> in the system.
@@ -476,8 +477,8 @@
                             preferredLocation.equals(newPreferredLocation) :
                             (newPreferredLocation == null);
 
-                if (!sameComponent || !toolTipText.equals(newToolTipText) ||
-                         !sameLoc) {
+                if (!sameComponent || !Objects.equals(toolTipText, newToolTipText)
+                        || !sameLoc) {
                     toolTipText = newToolTipText;
                     preferredLocation = newPreferredLocation;
                     showTipWindow();

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/javax/swing/JToolTip/6219960/bug6219960.java	Wed Dec 17 14:58:58 2014 +0300
@@ -0,0 +1,210 @@
+/*
+ * Copyright (c) 2014, 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.Component;
+import java.awt.Container;
+import java.awt.GridLayout;
+import java.awt.Point;
+import java.awt.Rectangle;
+import java.awt.Robot;
+import java.awt.AWTException;
+import java.awt.IllegalComponentStateException;
+import java.awt.event.InputEvent;
+import javax.swing.JButton;
+import javax.swing.JDesktopPane;
+import javax.swing.JFrame;
+import javax.swing.JInternalFrame;
+import javax.swing.JOptionPane;
+import javax.swing.JPanel;
+import javax.swing.JScrollPane;
+import javax.swing.JTable;
+import javax.swing.SwingUtilities;
+import javax.swing.ToolTipManager;
+import javax.swing.table.DefaultTableModel;
+
+/**
+ * @test
+ * @bug 6219960
+ * @summary null reference in ToolTipManager
+ * @run main bug6219960
+ */
+public class bug6219960 {
+
+    private static final String QUESTION = "Question";
+
+    static volatile JFrame frame;
+    static JTable table;
+
+    public static void main(String[] args) throws Exception {
+        Robot robot = new Robot();
+        SwingUtilities.invokeAndWait(bug6219960::createAndShowGUI);
+        robot.waitForIdle();
+        showModal("The tooltip should be showing. Press ok with mouse. And don't move it.");
+        robot.waitForIdle();
+        showModal("Now press ok and move the mouse inside the table (don't leave it).");
+        robot.waitForIdle();
+    }
+
+    private static void createAndShowGUI() {
+        ToolTipManager.sharedInstance().setDismissDelay(10 * 60 * 1000);
+        frame = new JFrame();
+        frame.setLocation(20, 20);
+        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        JDesktopPane desk = new JDesktopPane();
+        JInternalFrame iframe = new JInternalFrame();
+        iframe.setDefaultCloseOperation(JInternalFrame.DISPOSE_ON_CLOSE);
+        desk.add(iframe);
+        JButton save = new JButton();
+        save.setToolTipText("Wait for dialog to show.");
+        save.setText("Wait for the tooltip to show.");
+        JPanel panel = new JPanel(new GridLayout(1, 2));
+        panel.add(save);
+        table = createTable();
+        panel.add(new JScrollPane(table));
+        iframe.setContentPane(panel);
+        frame.getContentPane().add(desk);
+        frame.setSize(800, 600);
+        iframe.setSize(640, 480);
+        iframe.validate();
+        iframe.setVisible(true);
+        frame.validate();
+        frame.setVisible(true);
+        try {
+            iframe.setSelected(true);
+        } catch (Exception e) {
+            throw new AssertionError(e);
+        }
+
+        try {
+            Robot robot = new Robot();
+            Rectangle bounds = frame.getBounds();
+            int centerX = (int) (bounds.getX() + bounds.getWidth() / 6);
+            int centerY = (int) (bounds.getY() + bounds.getHeight() / 6);
+            robot.mouseMove(centerX, centerY);
+        } catch (AWTException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    private static void showModal(final String msg) throws Exception {
+
+        new Thread(() -> {
+
+            int timeout = 3000;
+            long endTime = System.currentTimeMillis() + timeout;
+
+            while (System.currentTimeMillis() <= endTime) {
+                if (pressOK(frame)) {
+                    return;
+                }
+            }
+            throw new RuntimeException("Internal frame has not been found!");
+        }).start();
+
+        Thread.sleep(900);
+
+        SwingUtilities.invokeAndWait(() -> {
+            JOptionPane.showInternalMessageDialog(table, msg,
+                    QUESTION,
+                    JOptionPane.PLAIN_MESSAGE);
+        });
+    }
+
+    private static JTable createTable() {
+        DefaultTableModel model = new DefaultTableModel();
+        JTable table = new JTable(model);
+        table.setFillsViewportHeight(true);
+        return table;
+    }
+
+    private static boolean pressOK(Component comp) {
+
+        JInternalFrame internalFrame
+                = findModalInternalFrame(comp, QUESTION);
+
+        if (internalFrame == null) {
+            return false;
+        }
+
+        JButton button = (JButton) findButton(internalFrame);
+
+        if (button == null) {
+            return false;
+        }
+
+        try {
+            Robot robot = new Robot();
+            Point location = button.getLocationOnScreen();
+            Rectangle bounds = button.getBounds();
+            int centerX = (int) (location.getX() + bounds.getWidth() / 2);
+            int centerY = (int) (location.getY() + bounds.getHeight() / 2);
+            robot.mouseMove(centerX, centerY);
+            robot.mousePress(InputEvent.BUTTON1_MASK);
+            robot.mouseRelease(InputEvent.BUTTON1_MASK);
+        } catch (IllegalComponentStateException ignore) {
+            return false;
+        } catch (AWTException e) {
+            throw new RuntimeException(e);
+        }
+        return true;
+    }
+
+    private static JInternalFrame findModalInternalFrame(Component comp, String title) {
+
+        if (comp instanceof JInternalFrame) {
+            JInternalFrame internalFrame = (JInternalFrame) comp;
+            if (internalFrame.getTitle().equals(title)) {
+                return (JInternalFrame) comp;
+            }
+        }
+
+        if (comp instanceof Container) {
+            Container cont = (Container) comp;
+            for (int i = 0; i < cont.getComponentCount(); i++) {
+                JInternalFrame result = findModalInternalFrame(cont.getComponent(i), title);
+                if (result != null) {
+                    return result;
+                }
+            }
+        }
+        return null;
+    }
+
+    private static JButton findButton(Component comp) {
+
+        if (comp instanceof JButton) {
+            return (JButton) comp;
+        }
+
+        if (comp instanceof Container) {
+            Container cont = (Container) comp;
+            for (int i = 0; i < cont.getComponentCount(); i++) {
+                JButton result = findButton(cont.getComponent(i));
+                if (result != null) {
+                    return result;
+                }
+            }
+        }
+        return null;
+    }
+}