The code below can be used to with JTextArea as well as JEditorPane and JTextPane. The javax.swing.text.Utilities class provides a method to get row start for model position. A small extension of the method allows to get row and column numbers

    public static int getRow(int pos, JTextComponent editor) {
        int rn = (pos==0) ? 1 : 0;
        try {
            int offs=pos;
            while( offs>0) {
                offs=Utilities.getRowStart(editor, offs)-1;
                rn++;
            }
        } catch (BadLocationException e) {
            e.printStackTrace();
        }
        return rn;
    }

    public static int getColumn(int pos, JTextComponent editor) {
        try {
            return pos-Utilities.getRowStart(editor, pos)+1;
        } catch (BadLocationException e) {
            e.printStackTrace();
        }
        return -1;
    }

And how to use the methods

   myJTextComponent.addCaretListener(new CaretListener() {
       public void caretUpdate(CaretEvent e) {
           System.out.println("row="+getRow(e.getDot(), (JTextComponent)e.getSource()));
           System.out.println("col="+getColumn(e.getDot(), (JTextComponent)e.getSource()));
       }
   });