在Apache Tomcat上部署GWT应用程序

在服务器端，我有一类用于将SVG文件转换为PDF的类。

public class PdfHandler {
    private File savedFile;
    private File svgTempFile;

    public PdfHandler(String fileName) {
        this.savedFile = new File(File.separator + "documents" + File.separator + fileName);
    }

    public void convertToPdf(String inputFileName) {
        this.svgTempFile = new File(inputFileName);
        System.out.println(inputFileName);
        if (this.svgTempFile.exists()){
            System.out.println("Svg File exists");
        }
        else {
            System.out.println("Svg File not exists");
        }

        try {
            Transcoder transcoder = new PDFTranscoder();
            System.out.println("Transcoder created");
            FileInputStream fis = new FileInputStream(this.svgTempFile);
            System.out.println("Input stream created");
            FileOutputStream fos = new FileOutputStream(this.savedFile);
            System.out.println("Output stream created");
            TranscoderInput transcoderInput = new TranscoderInput(fis);
            System.out.println("Transcoder input created");
            TranscoderOutput transcoderOutput = new TranscoderOutput(fos);
            System.out.println("Transcoder output created");
            transcoder.transcode(transcoderInput, transcoderOutput);
            System.out.println("Conversion finished");

            fis.close();
            fos.close();
        } catch (Exception ex) {
            ex.printStackTrace();
            System.out.println("Exception");
        } finally {
            this.svgTempFile.delete();
            System.out.println("File deleted");
        }
            System.out.println("End of method");
    }
}

我有一个由RPC调用的方法。

public String generatePdf(PayDoc filledDoc) {
    //String svgFileName = this.generateSvg(filledDoc);
    //String pdfFileName = this.generateFileName("pdf");
    PdfHandler pdfHandler = new PdfHandler("myPdf.pdf");
    pdfHandler.convertToPdf(File.separator + "documents" + File.separator + "mySvg.svg");
        return null;//pdfFileName;
}

在eclipse中，一切正常，但在Tomcat上却不能。当我在Tomcat上调用时RPC失败这是Tomcat控制台输出：

\documents\mySvg.svg
Svg File exists
Transcoder created
Input stream created
Output stream created
Transcoder input created
Transcoder output created
File deleted

之后，在“文档”文件夹中，我有“ mySvg.svg”（仍未删除）和“ myPdf.pdf”（它为空）。