src/java.desktop/share/classes/javax/swing/plaf/basic/BasicArrowButton.java

@@ -214,10 +214,11 @@
          * {@code JComboBox}. Since the composite component typically gets the
          * focus, this method is overriden to return {@code false}.
          *
          * @return {@code false}
          */
+        @SuppressWarnings("deprecation")
         public boolean isFocusTraversable() {
           return false;
         }
 
         /**