"Pdf direct object belongs to other PDF document.Copy object to current pdf document." exception when generating PDF in iTunes 7

When I was generating pdf on iText7, the following things happened:

com.itextpdf.kernel.PdfException: Pdf direct object belongs to other PDF document.Copy object to current pdf document.
    atcom.itextpdf.kernel.pdf.PdfOutputStream.write(PdfOutputStream.java:195) to [kernel-7.0.2.jar:na]
    atcom.itextpdf.kernel.pdf.PdfOutputStream.write(PdfOutputStream.java:185) to [kernel-7.0.2.jar:na]
    atcom.itextpdf.kernel.pdf.PdfOutputStream.write(PdfOutputStream.java:115) to [kernel-7.0.2.jar:na]
    atcom.itextpdf.kernel.pdf.PdfOutputStream.write(PdfOutputStream.java:187) to [kernel-7.0.2.jar:na]
    atcom.itextpdf.kernel.pdf.PdfOutputStream.write(PdfOutputStream.java:115) to [kernel-7.0.2.jar:na]
    atcom.itextpdf.kernel.pdf.PdfOutputStream.write(PdfOutputStream.java:187) to [kernel-7.0.2.jar:na]
    atcom.itextpdf.kernel.pdf.PdfOutputStream.write(PdfOutputStream.java:115) to [kernel-7.0.2.jar:na]
    at com.itextpdf.kernel.pdf.PdfWriter.writeToBody (PdfWriter.java:383) to [kernel-7.0.2.jar:na]
    at com.itextpdf.kernel.pdf.PdfWriter.flushObject (PdfWriter.java:289) to [kernel-7.0.2.jar:na]
    at com.itextpdf.kernel.pdf.PdfDocument.flushObject (PdfDocument.java:1572) to [kernel-7.0.2.jar:na]
    at com.itextpdf.kernel.pdf.PdfObject.flush(PdfObject.java:159) to [kernel-7.0.2.jar:na]
    at com.itextpdf.kernel.pdf.PdfObject.flush(PdfObject.java:127) to [kernel-7.0.2.jar:na]
    at com.itextpdf.kernel.pdf.PdfObjectWrapper.flush (PdfObjectWrapper.java:94) to [kernel-7.0.2.jar:na]
    atcom.itextpdf.kernel.pdf.PdfPage.flush (PdfPage.java:495) to [kernel-7.0.2.jar:na]
    atcom.itextpdf.kernel.pdf.PdfPage.flush (PdfPage.java:454) to [kernel-7.0.2.jar:na]
    atcom.itextpdf.kernel.pdf.PdfDocument.close(PdfDocument.java:785) to [kernel-7.0.2.jar:na]
    at com.itextpdf.layout.Document.close(Document.java:120) to [layout-7.0.2.jar:na]
    at com.xcz.afbp.thirdparty.service.impl.GeneratePDFService.generatePDF (GeneratePDFService.java:160) to [classes/:na]

Code I generate

public void generatePDF (CreditQueryDataCreditQueryData, Map<String, UserCreditContentView>ContentViewMap, List<PackageCreditContentView>NeedRetrievedCreditCreditCreditCreditCreditCreditCreateCreatePDFile, etc.

    if(!pdfFile.exists()){
        boolean x=pdfFile.createNewFile();
        if(!x){
            LOG.error("Generated Statement Output" + pdfFile.getPath());
            return;
        }
    }

    PdfDocument pdf = new PdfDocument(new PdfWriter(newFileOutputStream(pdfFile)));
    Document document = new Document (pdf, PageSize.A4);
    document.setRenderer (new DocumentRenderer (document));

    pdf.addEventHandler(PdfDocumentEvent.END_PAGE, new WatermarkingEventHandler());

    try{
        //operate code just add tableTableBtableC...

    } catch(Exceptione){
        LOG.info();
    } US>finally
        document.close(); // exception here
    }


}

My style code for iText7 is

private PdfFont bfChinese=null;

Called in the service constructor.
I tried to set the font to static but it didn't work. This is an exception to placethrow.

private void write (PdfIndirectReference indirectReference) {
    if( document!=null&!indirectReference.getDocument().equals( document)){
        through new PdfException (PdfException.PdfIndirectObjectBelongsToOtherPdfDocument);
    }
    if(indirectReference.getRefersTo()==null){
        write(PdfNull.PDF_NULL);
    } else if(indirectReference.getGenNumber()==0){
        writeInteger(indirectReference.getObjNumber()) .
                writeBytes(endIndirectWithZeroGenNr);
    } else{
        writeInteger(indirectReference.getObjNumber()) .
                writeSpace().
                writeInteger(indirectReference.getGenNumber()) .
                writeBytes(endIndirect);
    }
}

This means that there are two different documents, but you don't know when you created another document.

java pdf

2022-09-30 10:23

2 Answers

A particular PdfFont instance can only be used for one document; as soon as you use the PdfFont instance, it is linked to that document and cannot be used in another document

For example,

class ThisGoesWrong {

    protected PdfFont;

    public ThisGoesWrong(){
        font = PdfFontFactory.createFont(...);
    }

    public void createPdf(){
        ...
        Paragrap = new Paragrap("test").setFont(font);
        document.add(p);
        ...
    }
}

The ThisGoesWrong class creates the correct PDF when calling the first createPdf(), but an exception appears when calling the second time.

This problem can be resolved as follows:

class ThisWorksOK {

    public ThisWorksOK(){
    }

    public void createPdf(){
        ...
        PdfFontfont=PdfFontFactory.createFont(...);
        Paragrap = new Paragrap("test").setFont(font);
        document.add(p);
        ...
    }
}

2022-09-30 10:23

You can use other third-party tools to create documents such as PDFs on components.

Tools to use: Spire.PDF for.NET

Detailed Code:

PdfDocument doc=newPdfDocument();
PdfPageBase page=newDoc.Pages.Add();
string message="Hello world!";
PdfFontfont=new PdfFont(PdfFontFamily.Helvetica, 13f);
PdfBrush brush = PdfBrush.Red;
PointFlocation=newPointF(20,20);

This allows you to successfully create PDF documents.

2022-09-30 10:23

If you have any answers or tips

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