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

*** 214,223 ****
--- 214,224 ----
           * {@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;
          }
  
          /**