private void installDefaultCopyAction() {
    final Action copy = getActionMap().get("copy");
    if (copy == null || copy instanceof UIResource) {
      Action newCopy = new AbstractAction() {
        @Override
        public boolean isEnabled() {
          return getSelectedIndex() != -1;
        }

        @Override
        public void actionPerformed(ActionEvent e) {
          doCopyToClipboardAction();
        }
      };
      getActionMap().put("copy", newCopy);
    }
  }
private void installDefaultCopyAction()