HTMLEditorKit.insertHTML() splits existing tag

Question

Hi guys!
I try to create a simple editor with a JEditorPane, but when it comes to formating the HTML content, there's a little problem. ATM I use this way to insert a formatted text:
HTMLDocument html = (HTMLDocument) editorPane.getDocument();
HTMLEditorKit kit = (HTMLEditorKit) editorPane.getEditorKit();
try {
    String s = "<strong>�+html.getText(start, end - start)+�</strong>�;
    // remove old, change to bold
    html.remove(start, end - start);
    kit.insertHTML(html, start, s, 0, 0, HTML.Tag.STRONG);
} catch (BadLocationException e1) {
    e1.printStackTrace();
} catch (IOException e1) {
    e1.printStackTrace();
}But when I try to insert another format inside of the previously created STRONG tag, the HTMLEditorKit splits up the old tags, closing it, inserting the new tag and after the newly isnerted tag it opens up the old STRONG again.
Can someone please help me with this? It think it's just a small thinking mistake I make, but I can't figure out how to insert a tag inside another tag...
thanks in forward

Answer 1

Sorry for the long gap between my postings. I'm kinda busy these days.
I tried to use the parameters, but when I change the code from
HTMLDocument html = (HTMLDocument) editorPane.getDocument();
HTMLEditorKit kit = (HTMLEditorKit) editorPane.getEditorKit();
try {
  String s = "<strong>"+html.getText(start, end - start)+"</strong>";
  // remove old, change to bold
  html.remove(start, end - start);
  kit.insertHTML(html, start, s, 0, 0, HTML.Tag.STRONG);
} catch (BadLocationException e1) {
  e1.printStackTrace();
} catch (IOException e1) {
  e1.printStackTrace();
}into
  kit.insertHTML(html, start, s, 1, 1, HTML.Tag.STRONG);a NullPointerException is generated. Can you help me to interpret the API docs for those parameters? I don't have a clue how to insert a bold text into a sentence.
I tried with a sentence without any formatting and with a EM tag surrounding the whole sentence.