脆蛋白.Fop Apache Fop C#端口

我使用这个包有一段时间了，它运行得很好。更新到最新的软件包后，代码中断。

使用某些默认构造函数初始化工厂后我得到一个错误：

'org.apache.fop.render.ImageHandlerRegistry' threw an exception.

有人知道配置程序应该是什么样子的，这样它就能再次工作了吗？

    public string GeneratePdf(string foFile, string pdfFile)
    {
        OutputStream os = new BufferedOutputStream(new FileOutputStream(new java.io.File(pdfFile)));
        string ret = "";
        try
        {
            // Factory before update
            FopFactory fopFactory = FopFactory.newInstance();
            // After the update the Factory needs some sort of configuration
            // I tryed with all the constructors but can't get the sample to work.
            FopFactory fopFactory = FopFactory.newInstance(null);
            Fop fop = fopFactory.newFop("application/pdf", os);
            FOUserAgent foUserAgent = fop.getUserAgent();
            javax.xml.transform.TransformerFactory factory = javax.xml.transform.TransformerFactory.newInstance();
            javax.xml.transform.Transformer transformer = factory.newTransformer();
            javax.xml.transform.Source src = new javax.xml.transform.stream.StreamSource(new java.io.File(foFile));
            javax.xml.transform.Result res = new javax.xml.transform.sax.SAXResult(fop.getDefaultHandler());
            transformer.transform(src, res);
            ret = pdfFile;
        }
        catch (Exception ex)
        {
            throw ex;
        }
        finally
        {
            os.close();
        }
        return ret;
    }