iText PDF编写器Java奇怪的问题

Question

使用带有java的iText 5.1.3 PDF库时，我遇到了一个奇怪的问题。当我使用main方法运行代码并生成PDF时，我的代码工作正常，但是当我在Web应用程序中使用相同的功能时，我需要下载该PDF，它在前端显示异常

HTTP Status 500 - Dispatch[/Invoice] to method funcName returned an exception

虽然它不会在控制台上打印任何异常。 这是我的代码，任何人都可以查看我的代码并解释此代码的问题。

import com.ilex.invoice.reporting.common.IlexReportPDFConstants;
import com.ilex.report.pdf.helper.PDFUtils;
import com.itextpdf.text.BaseColor;
import com.itextpdf.text.Chunk;
import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Font;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.Phrase;
import com.itextpdf.text.html.WebColors;
import com.itextpdf.text.pdf.PdfPCell;
import com.itextpdf.text.pdf.PdfPTable;
import com.itextpdf.text.pdf.PdfWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.commons.io.IOUtils;

public class SimpleTable {

    public static final String DEST = "results/tables/simple_table.pdf";

    public static void main(String[] args) throws IOException, DocumentException, Exception {
        File file = new File(DEST);
        file.getParentFile().mkdirs();
        new SimpleTable().createPdf(DEST);
        new SimpleTable().generateInvPDF();
    }

    public void createPdf(String dest) throws IOException, DocumentException, Exception {
        Document document = new Document(PageSize.A4.rotate(),
                IlexReportPDFConstants.PAGE_LEFT_MARGIN, IlexReportPDFConstants.PAGE_TOP_MARGIN, IlexReportPDFConstants.PAGE_RIGHT_MARGIN,
                IlexReportPDFConstants.PAGE_BOTTOM_MARGIN);

        PdfWriter.getInstance(document, new FileOutputStream(dest));
        document.open();
        PdfPTable table = new PdfPTable(76);
        table = populateHeader(table);
        for (int aw = 0; aw < 150 * 76; aw++) {
            table.addCell(getNormalCell("Some Text Here", 1.5f));
        }
        table.setTotalWidth(800f);
        table.setLockedWidth(true);

        document.add(table);
        document.close();
    }

    public static PdfPCell getNormalCell(String string, float size)
            throws DocumentException, IOException {
        if (string != null && "".equals(string)) {
            return new PdfPCell();
        }
        Font f = new Font();
        f.setColor(BaseColor.BLACK);
        f.setSize(size);
        f.setStyle("normal");
        PdfPCell cell = new PdfPCell(new Phrase(string, f));
        cell.setNoWrap(false);
        cell.setBorderWidth(0.1f);
        return cell;
    }

    public static PdfPCell getHeaderCell(String string, float size)
            throws DocumentException, IOException {

        Font f = new Font();
        f.setSize(size);
        PdfPCell cell = new PdfPCell(new Phrase(string, f));
        cell.setNoWrap(false);
        BaseColor myColor = WebColors.getRGBColor("#D3D3D3");
        cell.setBackgroundColor(myColor);
        cell.setBorderWidth(0.1f);
        return cell;
    }

    PdfPTable populateHeader(PdfPTable table) throws Exception {
        table.addCell(getHeaderCell("Invoice #", 1.8f));
        table.addCell(getHeaderCell("Approved Date", 1.8f));
        table.addCell(getHeaderCell("PO#", 1.8f));
        table.addCell(getHeaderCell("Partner", 1.8f));
        table.addCell(getHeaderCell("Category", 1.8f));
        table.addCell(getHeaderCell("Comcast Vendor ID", 1.8f));
        table.addCell(getHeaderCell("Comcast Site Code", 1.8f));
        table.addCell(getHeaderCell("Authorized", 1.8f));
        table.addCell(getHeaderCell("Invoiced", 1.8f));
        table.addCell(getHeaderCell("Approved", 1.8f));
        table.addCell(getHeaderCell("Customer", 1.8f));
        table.addCell(getHeaderCell("Project", 1.8f));
        table.addCell(getHeaderCell("Job", 1.8f));
        table.addCell(getHeaderCell("Site", 1.8f));
        table.addCell(getHeaderCell("Job Complete", 1.8f));
        table.addCell(getHeaderCell("First onsite", 1.8f));
        table.addCell(getHeaderCell("Last offsite", 1.8f));
        table.addCell(getHeaderCell("PO Complete", 1.8f));
        table.addCell(getHeaderCell("PM", 1.8f));
        table.addCell(getHeaderCell("Owner", 1.8f));
        table.addCell(getHeaderCell("Partner / Invoice", 1.8f));
        table.addCell(getHeaderCell("Dup Inv check", 1.8f));
        table.addCell(getHeaderCell("Dup PO Number", 1.8f));
        table.addCell(getHeaderCell("Layout code", 1.8f));
        table.addCell(getHeaderCell("Source Name", 1.8f));
        table.addCell(getHeaderCell("Invoice Type", 1.8f));
        table.addCell(getHeaderCell("operating Unit", 1.8f));
        table.addCell(getHeaderCell("Vendor Number", 1.8f));
        table.addCell(getHeaderCell("Vendor Site Code", 1.8f));
        table.addCell(getHeaderCell("Invoice Num", 1.8f));
        table.addCell(getHeaderCell("Invoice Date", 1.8f));
        table.addCell(getHeaderCell("Currency Code", 1.8f));
        table.addCell(getHeaderCell("Invoice Amount", 1.8f));
        table.addCell(getHeaderCell("Invoice H Desc", 1.8f));
        table.addCell(getHeaderCell("Pay Group", 1.8f));
        table.addCell(getHeaderCell("Invoice Line Type", 1.8f));
        table.addCell(getHeaderCell("Invoice Line Number", 1.8f));
        table.addCell(getHeaderCell("Inv L Description", 1.8f));
        table.addCell(getHeaderCell("Inv Line Amount", 1.8f));
        table.addCell(getHeaderCell("Tax Code", 1.8f));
        table.addCell(getHeaderCell("Concatenated Distr Acct", 1.8f));
        table.addCell(getHeaderCell("Source Sys Ref", 1.8f));
        table.addCell(getHeaderCell("H Attribute3", 1.8f));
        table.addCell(getHeaderCell("H Attribute4", 1.8f));
        table.addCell(getHeaderCell("H Attribute5", 1.8f));
        table.addCell(getHeaderCell("H Attribute6", 1.8f));
        table.addCell(getHeaderCell("H Attribut7", 1.8f));
        table.addCell(getHeaderCell("H Attribute8", 1.8f));
        table.addCell(getHeaderCell("H Attribute9", 1.8f));
        table.addCell(getHeaderCell("H Attribut10", 1.8f));
        table.addCell(getHeaderCell("H Attribute11", 1.8f));
        table.addCell(getHeaderCell("H Attribute12", 1.8f));
        table.addCell(getHeaderCell("H Attribute13", 1.8f));
        table.addCell(getHeaderCell("H Attribute14", 1.8f));
        table.addCell(getHeaderCell("H Attribute15", 1.8f));
        table.addCell(getHeaderCell("L Attribute1", 1.8f));
        table.addCell(getHeaderCell("L Attribute2", 1.8f));
        table.addCell(getHeaderCell("L Attribute3", 1.8f));
        table.addCell(getHeaderCell("L Attribute4", 1.8f));
        table.addCell(getHeaderCell("L Attribute5", 1.8f));
        table.addCell(getHeaderCell("L Attribute6", 1.8f));
        table.addCell(getHeaderCell("L Attribute7", 1.8f));
        table.addCell(getHeaderCell("L Attribute8", 1.8f));
        table.addCell(getHeaderCell("L Attribute9", 1.8f));
        table.addCell(getHeaderCell("L Attribute10", 1.8f));
        table.addCell(getHeaderCell("L Attribute11", 1.8f));
        table.addCell(getHeaderCell("L Attribute12", 1.8f));
        table.addCell(getHeaderCell("L Attribute13", 1.8f));
        table.addCell(getHeaderCell("L Attribute14", 1.8f));
        table.addCell(getHeaderCell("L Attribute15", 1.8f));
        table.addCell(getHeaderCell("H Attr Category", 1.8f));
        table.addCell(getHeaderCell("L Attr Category", 1.8f));
        table.addCell(getHeaderCell("H Terms Date", 1.8f));
        table.addCell(getHeaderCell("H Terms Name", 1.8f));
        table.addCell(getHeaderCell("H Attribute1", 1.8f));
        table.addCell(getHeaderCell("H Legal Entity Name", 1.8f));

        return table;
    }

    /*
     * public static void main(String[] args) { try { float indentationLeft = 20f; float indentationLeftTemp = 20f; List prtLst = new List(List.UNORDERED);
     * prtLst.setListSymbol("\u2022"); prtLst.add("P1"); prtLst.setListSymbol("+"); prtLst.add("P2"); prtLst.setListSymbol("\u2022"); List prevList = prtLst; for (int i =
     * 0; i < 500; i++) { List chldLst2 = new List(List.UNORDERED); chldLst2.setIndentationLeft(indentationLeft); indentationLeftTemp += 20f;
     * chldLst2.setListSymbol("\u2022"); chldLst2.add("YY" + i); prevList.add(chldLst2); prevList = chldLst2; } prtLst.add("P3");
     *
     * Document d = null; if (indentationLeftTemp > 400f) { Rectangle pageSize = new Rectangle(indentationLeftTemp + 200f, indentationLeftTemp + 200f); d = new
     * Document(pageSize); } else { d = new Document(); } PdfWriter.getInstance(d, new FileOutputStream("D:/test.pdf")); d.open(); d.add(prtLst); d.close(); } catch
     * (Exception e) { e.printStackTrace(); } }
     *
     */
    private byte[] generateInvPDF() {
        File tempFile = PDFUtils.getTempFile();
        Document document = null;
        OutputStream pdfOut = null;
        InputStream pdfIn = null;
        try {
            //IlexReportPDFConstants.PAGE_SIZE
            document = new Document(PageSize.A4.rotate(),
                    IlexReportPDFConstants.PAGE_LEFT_MARGIN, IlexReportPDFConstants.PAGE_TOP_MARGIN, IlexReportPDFConstants.PAGE_RIGHT_MARGIN,
                    IlexReportPDFConstants.PAGE_BOTTOM_MARGIN);

            pdfOut = new FileOutputStream(tempFile);

            PdfWriter writer = PdfWriter.getInstance(document, pdfOut);

            document.open();
            document.add(new Chunk(""));
            PdfPTable table = new PdfPTable(76);
            table = populateHeader(table);
            for (int aw = 0; aw < 150 * 76; aw++) {
                table.addCell(getNormalCell("Some Text Here", 1.5f));
            }
            table.setTotalWidth(800f);
            table.setLockedWidth(true);

//            PdfAction action = PdfAction.gotoLocalPage(1, new PdfDestination(PdfDestination.FIT, 0, 10000, 1), writer);
//            writer.setOpenAction(action);
            writer.setViewerPreferences(PdfWriter.FitWindow | PdfWriter.CenterWindow);
            document.add(table);
            document.close();

            pdfIn = new FileInputStream(tempFile);

            return IOUtils.toByteArray(pdfIn);
        } catch (DocumentException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (document != null) {
                try {
                    document.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }

            IOUtils.closeQuietly(pdfOut);
            IOUtils.closeQuietly(pdfIn);

            try {
                if (tempFile.exists()) {
                    tempFile.delete();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return null;
    }
}

尝试将单元格添加到表格i-e table.addCell时出现问题 当它到达addCell行时它没有说什么，没有抛出异常并且控制转移到generateInvPDF()的finally块 提前致谢。