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

*** 159,168 ****
--- 159,169 ----
                                  CellRendererPane pane, JList<Object> list ) {
          this( cb, i, pane, list );
          iconOnly = onlyIcon;
      }
  
+     @SuppressWarnings("deprecation")
      public boolean isFocusTraversable() {
          return false;
      }
  
      public void setEnabled(boolean enabled) {