src/share/classes/com/sun/java/swing/plaf/windows/WindowsInternalFrameTitlePane.java

@@ -39,10 +39,11 @@
 import java.beans.PropertyVetoException;
 
 import static com.sun.java.swing.plaf.windows.TMSchema.*;
 import static com.sun.java.swing.plaf.windows.XPStyle.Skin;
 
+@SuppressWarnings("serial") // Superclass is not serializable across versions
 public class WindowsInternalFrameTitlePane extends BasicInternalFrameTitlePane {
     private Color selectedTitleGradientColor;
     private Color notSelectedTitleGradientColor;
     private JPopupMenu systemPopupMenu;
     private JLabel systemLabel;

@@ -265,11 +266,12 @@
 
     protected void assembleSystemMenu() {
         systemPopupMenu = new JPopupMenu();
         addSystemMenuItems(systemPopupMenu);
         enableActions();
-        systemLabel = new JLabel(frame.getFrameIcon()) {
+        @SuppressWarnings("serial") // anonymous class
+        JLabel tmp = new JLabel(frame.getFrameIcon()) {
             protected void paintComponent(Graphics g) {
                 int x = 0;
                 int y = 0;
                 int w = getWidth();
                 int h = getHeight();

@@ -301,10 +303,11 @@
                     icon.paintIcon(this, g, 0, 0);
                 }
                 g.dispose();
             }
         };
+        systemLabel = tmp;
         systemLabel.addMouseListener(new MouseAdapter() {
             public void mouseClicked(MouseEvent e) {
                 if (e.getClickCount() == 2 && frame.isClosable() &&
                     !frame.isIcon()) {
                     systemPopupMenu.setVisible(false);