sclass HighlightCaret extends DefaultCaret {
  private static final Highlighter.HighlightPainter unfocusedPainter = new DefaultHighlighter.DefaultHighlightPainter(Color.LIGHTGRAY);
  private static final Highlighter.HighlightPainter focusedPainter = new DefaultHighlighter.DefaultHighlightPainter(Color.LIGHTGRAY);
  private static final long serialVersionUID = 1L;
  private boolean isFocused;

  @Override
  protected Highlighter.HighlightPainter getSelectionPainter() {
    setBlinkRate(500); // otherwise is disabled, stopped
    return isFocused ? focusedPainter/*super.getSelectionPainter()*/ : unfocusedPainter;
  }

  @Override
  public void setSelectionVisible(boolean hasFocus) {
    if (hasFocus != isFocused) {
        isFocused = hasFocus;
        super.setSelectionVisible(false);
        super.setSelectionVisible(true);
    }
}
}