Converter HTML para PPTX em Java

Presentation presentation = new Presentation();
try {
    presentation.getSlides().removeAt(0);
    FileInputStream htmlStream = new FileInputStream("page.html");
    try {
        presentation.getSlides().addFromHtml(htmlStream);
    } finally {
        if (htmlStream != null) htmlStream.close();
    }

    presentation.save("Presentation.pptx", SaveFormat.Pptx);
} catch(IOException e) {
} finally {
    if (presentation != null) presentation.dispose();
}