--- a/jdk/src/share/classes/javax/swing/plaf/basic/BasicTableHeaderUI.java	Tue Jun 22 14:36:46 2010 +0400
+++ b/jdk/src/share/classes/javax/swing/plaf/basic/BasicTableHeaderUI.java	Tue Jun 22 19:38:27 2010 +0400
@@ -876,7 +876,7 @@
             String name = getName();
             if (TOGGLE_SORT_ORDER == name) {
                 JTable table = th.getTable();
-                RowSorter sorter = table.getRowSorter();
+                RowSorter sorter = table == null ? null : table.getRowSorter();
                 if (sorter != null) {
                     int columnIndex = ui.getSelectedColumnIndex();
                     columnIndex = table.convertColumnIndexToModel(

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/javax/swing/JTable/6777378/bug6777378.java	Tue Jun 22 19:38:27 2010 +0400
@@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 2010, 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
+   @bug 6777378
+   @summary NullPointerException in XPDefaultRenderer.paint()
+   @author Alexander Potochkin
+   @run main bug6777378
+*/
+
+import sun.awt.SunToolkit;
+
+import javax.swing.*;
+import javax.swing.table.AbstractTableModel;
+import javax.swing.table.JTableHeader;
+import javax.swing.plaf.metal.MetalLookAndFeel;
+import java.awt.event.MouseEvent;
+import java.awt.event.InputEvent;
+import java.awt.*;
+
+public class bug6777378 {
+    private static JFrame frame;
+    private static JTableHeader header;
+
+    public static void main(String[] args) throws Exception {
+        SunToolkit toolkit = (SunToolkit) Toolkit.getDefaultToolkit();
+        Robot robot = new Robot();
+        robot.setAutoDelay(20);
+        SwingUtilities.invokeAndWait(new Runnable() {
+            public void run() {
+                try {
+                    UIManager.setLookAndFeel(new MetalLookAndFeel());
+                } catch (Exception e) {
+                    e.printStackTrace();
+                }
+                JTable table = new JTable(new AbstractTableModel() {
+                    public int getRowCount() {
+                        return 10;
+                    }
+
+                    public int getColumnCount() {
+                        return 10;
+                    }
+
+                    public Object getValueAt(int rowIndex, int columnIndex) {
+                        return "" + rowIndex + " " + columnIndex;
+                    }
+                });
+
+                header = new JTableHeader(table.getColumnModel());
+                header.setToolTipText("hello");
+
+                frame = new JFrame();
+                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+                frame.add(header);
+
+                frame.setSize(300, 300);
+                frame.setVisible(true);
+            }
+        });
+        toolkit.realSync();
+        Point point = header.getLocationOnScreen();
+        robot.mouseMove(point.x + 20, point.y + 50);
+        robot.mouseMove(point.x + 30, point.y + 50);
+        robot.mousePress(InputEvent.BUTTON1_MASK);
+        robot.mouseRelease(InputEvent.BUTTON1_MASK);
+    }
+}