6913768: With default SynthLookAndFeel instance installed new JTable creation leads to throwing NPE

Reviewed-by: peterz

jdk/src/share/classes/javax/swing/JTable.java

@@ -2506,11 +2506,8 @@ public class JTable extends JComponent implements TableModelListener, Scrollable
         Color old = this.selectionForeground;
         this.selectionForeground = selectionForeground;
         firePropertyChange("selectionForeground", old, selectionForeground);
-        if ( !selectionForeground.equals(old) )
-        {
         repaint();
     }
-    }
 
     /**
      * Returns the background color for selected cells.
@@ -2547,11 +2544,8 @@ public class JTable extends JComponent implements TableModelListener, Scrollable
         Color old = this.selectionBackground;
         this.selectionBackground = selectionBackground;
         firePropertyChange("selectionBackground", old, selectionBackground);
-        if ( !selectionBackground.equals(old) )
-        {
         repaint();
     }
-    }
 
     /**
      * Returns the <code>TableColumn</code> object for the column in the table

jdk/src/share/classes/javax/swing/plaf/synth/SynthTableUI.java

@@ -45,8 +45,7 @@ import javax.swing.JLabel;
 import javax.swing.JTable;
 import javax.swing.LookAndFeel;
 import javax.swing.border.Border;
-import javax.swing.plaf.ComponentUI;
-import javax.swing.plaf.UIResource;
+import javax.swing.plaf.*;
 import javax.swing.plaf.basic.BasicTableUI;
 import javax.swing.table.DefaultTableCellRenderer;
 import javax.swing.table.JTableHeader;
@@ -158,7 +157,7 @@ public class SynthTableUI extends BasicTableUI
                 if (gridColor == null) {
                     gridColor = style.getColor(context, ColorType.FOREGROUND);
                 }
-                table.setGridColor(gridColor);
+                table.setGridColor(gridColor == null ? new ColorUIResource(Color.GRAY) : gridColor);
             }
 
             useTableColors = style.getBoolean(context,

jdk/test/javax/swing/JTable/6913768/bug6913768.java

+/*
+ * Copyright 2010 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 6913768
+ * @summary With default SynthLookAndFeel instance installed new JTable creation leads to throwing NPE
+ * @author Pavel Porvatov
+ * @run main bug6913768
+ */
+
+import javax.swing.*;
+import javax.swing.plaf.synth.SynthLookAndFeel;
+
+public class bug6913768 {
+    public static void main(String[] args) throws Exception {
+        UIManager.setLookAndFeel(new SynthLookAndFeel());
+
+        SwingUtilities.invokeAndWait(new Runnable() {
+            public void run() {
+                JFrame frame = new JFrame();
+
+                JTable table = new JTable(new Object[][]{{"1", "2"}, {"3", "4"}},
+                        new Object[]{"col1", "col2"});
+
+                frame.getContentPane().add(new JScrollPane(table));
+                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+                frame.setSize(300, 200);
+                frame.setLocationRelativeTo(null);
+                frame.setVisible(true);
+            }
+        });
+    }
+}