--- a/jdk/src/share/classes/javax/swing/AbstractButton.java	Tue Dec 13 17:30:21 2011 +0400
+++ b/jdk/src/share/classes/javax/swing/AbstractButton.java	Tue Dec 13 18:38:39 2011 +0400
@@ -1349,6 +1349,7 @@
         return new ButtonActionPropertyChangeListener(this, a);
     }
 
+    @SuppressWarnings("serial")
     private static class ButtonActionPropertyChangeListener
                  extends ActionPropertyChangeListener<AbstractButton> {
         ButtonActionPropertyChangeListener(AbstractButton b, Action a) {
@@ -1976,6 +1977,7 @@
      * has been added to the <code>java.beans</code> package.
      * Please see {@link java.beans.XMLEncoder}.
      */
+    @SuppressWarnings("serial")
     protected class ButtonChangeListener implements ChangeListener, Serializable {
         // NOTE: This class is NOT used, instead the functionality has
         // been moved to Handler.
@@ -2320,6 +2322,7 @@
     //
     // Listeners that are added to model
     //
+    @SuppressWarnings("serial")
     class Handler implements ActionListener, ChangeListener, ItemListener,
                              Serializable {
         //
@@ -2472,7 +2475,7 @@
                         // the members of the button group.
                         int len = group.getButtonCount();
                         Object [] target = new Object[len];
-                        Enumeration elem = group.getElements();
+                        Enumeration<AbstractButton> elem = group.getElements();
                         for (int i = 0; i < len; i++) {
                             if (elem.hasMoreElements()) {
                                 target[i] = elem.nextElement();