src/java.desktop/share/classes/javax/swing/plaf/metal/MetalComboBoxButton.java

@@ -159,10 +159,11 @@
                                 CellRendererPane pane, JList<Object> list ) {
         this( cb, i, pane, list );
         iconOnly = onlyIcon;
     }
 
+    @SuppressWarnings("deprecation")
     public boolean isFocusTraversable() {
         return false;
     }
 
     public void setEnabled(boolean enabled) {