static class LogView extends JScrollPane {

  JTextPane textPane;

  *() {

    textPane = new JTextPane();

    textPane.setEditable(false);

    setViewportView(textPane);

  }

  // thread safe

  public void logText(final String text) {

    awt {

      System.out.println("printing");

      Document document = textPane.getDocument();

      System.out.println("inserting");

      document.insertString(document.getLength(), text, null);

      System.out.println("done printing");

      // todo: scroll?

    }

  }

  // log some pure text and add a line feed

  // thread safe

  public void println(String line) {

    logText(line + "\n");

  }

  // thread safe

  public void clear() {

    awt { textPane.setText(""); }

  }

}