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

*** 405,414 ****
--- 405,415 ----
          } else {
              return super.createArrowButton();
          }
      }
  
+     @SuppressWarnings("serial") // Superclass is not serializable across versions
      private class XPComboBoxButton extends XPStyle.GlyphButton {
          public XPComboBoxButton() {
              super(null,
                    (! XPStyle.getXP().isSkinDefined(comboBox, Part.CP_DROPDOWNBUTTONRIGHT))
                     ? Part.CP_DROPDOWNBUTTON
*** 457,466 ****
--- 458,468 ----
       * Do not call or override.
       *
       * @deprecated As of Java 2 platform v1.4.
       */
      @Deprecated
+     @SuppressWarnings("serial") // Superclass is not serializable across versions
      protected class WindowsComboPopup extends BasicComboPopup {
  
          public WindowsComboPopup( JComboBox cBox ) {
              super( cBox );
          }
*** 508,517 ****
--- 510,520 ----
  
      /**
       * Subclassed to set opacity {@code false} on the renderer
       * and to show border for focused cells.
       */
+     @SuppressWarnings("serial") // Superclass is not serializable across versions
      private static class WindowsComboBoxRenderer
            extends BasicComboBoxRenderer.UIResource {
          private static final Object BORDER_KEY
              = new StringUIClientPropertyKey("BORDER_KEY");
          private static final Border NULL_BORDER = new EmptyBorder(0, 0, 0, 0);