PDF Export with UTF-8 xwiki encoding doesn't work (no content)

The PDF export create a PDF file with empty content when XWIKI is configure in xwiki.cfg with xwiki.encoding=UTF-8 .
To solve my problem, in class com.xpn.xwiki.pdf.impl.PdfExportImpl method exportHtml.java ; i replace :

exportXHtml(applyCSS(convertToStrictXHtml(html.getBytes(), context), context), out, type, context);

with

//AF PATCH ENCODING
//exportXHtml(applyCSS(convertToStrictXHtml(html.getBytes(), context), context), out, type, context);
try

{ exportXHtml(applyCSS(convertToStrictXHtml(html.getBytes(context.getWiki().getEncoding()), context), context), out, type, context); }

catch (UnsupportedEncodingException e)

{ e.printStackTrace(); throw new XWikiException(); }

I think the problem is here... but i let youfixed this bug.

Ask me if you need more informations.