Character widths in JTextPane

Hello everybody
I write a WYSIWYG Report-Editor. My Problem is that the character-widths in the Editor is different to the Output (rtf,pdf).
For Exaple in the Editor i can write 45 w's (Arial,plain,11) in one Line an in the Output is was 57. With Times New Roman i can write 64 ant in the Output is possible to set only 57 in one line.
So i have write an own BoxView for the TextPane and set int the paint method "g2D.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS,RenderingHints.VALUE_FRACTIONALMETRICS_ON)" The result is that the characterwitds are identic to the output but the caretpositions in the editor are wrong.
Then i try to set putProperty("i18n", Boolean.TRUE) in the document. The result is that the characterwidts are equals the the version without fractionalmetrics->ON.
What can i do?
Thanks Thomas

Thank You for the tip
I overwrites the getFontMetrics Method in the JTextPane
@Override
public FontMetrics getFontMetrics(Font font) {
Graphics graphics = getGraphics();
Graphics2D g2d = (Graphics2D) graphics;
if(g2d == null){
return super.getFontMetrics(font);
g2d.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS,RenderingHints.VALUE_FRACTIONALMETRICS_ON);
return g2d.getFontMetrics(font);
It works!

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I have a starnge feeling that this may be partly to do with the size
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10 point=     374
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at 96 dpi this is 455.5.
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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.*;
public class Fonts extends JFrame{
private static final String text =
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
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        public void mouseMoved(MouseEvent me) {
          System.out.println(me.getX()+" "+getY());
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public JTextPane getTextPane() {
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public static void main(String[] args) {
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       f.setVisible(true);
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Thank You for the tip
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@Override
public FontMetrics getFontMetrics(Font font) {
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It works!

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Character widths in JTextPane

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