How can I resolve the error saying Document was closed using iText 7.1.6?

Question

I am using iText 7.1.6 to generate the PDF. When I try to run , I get this error document was closed . It is impossible to execute the action.

I checked solutions on Stack Overflow for this, but they are saying it is related to fonts. I modified the fonts by creating instance every time I use it, but even then I get same issue.

How can I resolve this issue?

Please find the below code and exception:

Document doc = null;
PdfPage sourcePage = null;
try (InputStream resource = new FileInputStream(new File(Paths.get("Output").toAbsolutePath()+"/source.pdf"));
     PdfReader pdfReader = new PdfReader(resource);
     PdfDocument pdfDocument = new PdfDocument(pdfReader)) {

    PdfDocumentContentParser contentParser = new PdfDocumentContentParser(pdfDocument);
    MarginFinder strategy = contentParser.processContent(1, new MarginFinder());

    sourcePage = pdfDocument.getPage(1);
    sourcePage.setCropBox(strategy.getBoundingBox());
    sourcePage.setMediaBox(strategy.getBoundingBox());
}


@SuppressWarnings("resource")
PdfWriter writer = new PdfWriter(new FileOutputStream(new File(Paths.get("Output").toAbsolutePath()+"/final.pdf"))).setSmartMode(true);
PdfDocument pdfDoc = new PdfDocument(writer);
pdfDoc.setDefaultPageSize(PageSize.A3.rotate());
String fonts[] = {Paths.get("fonts").toAbsolutePath() + "/TREBUC.TTF", Paths.get("fonts").toAbsolutePath() + "/TREBUCBD.TTF", Paths.get("fonts").toAbsolutePath() + "/TREBUCBI.TTF",Paths.get("fonts").toAbsolutePath() + "/TREBUCIT.TTF"};
FontProvider fontProvider = new FontProvider();
Map<String, PdfFont> pdfFontMap = new HashMap<String, PdfFont>();
for (String font : fonts) {
    FontProgram fontProgram = FontProgramFactory.createFont(font);
    if (font.endsWith("TREBUC.TTF")) {
        pdfFontMap.put("NORMAL", PdfFontFactory.createFont(fontProgram, PdfEncodings.WINANSI, true));
    } else if (font.endsWith("TREBUCBD.TTF")) {
        pdfFontMap.put("BOLD", PdfFontFactory.createFont(fontProgram, PdfEncodings.WINANSI, true));
    } else if (font.endsWith("TREBUCBI.TTF")) {
        pdfFontMap.put("BOLD_ITALIC", PdfFontFactory.createFont(fontProgram, PdfEncodings.WINANSI, true));
    } else if (font.endsWith("TREBUCIT.TTF")) {
        pdfFontMap.put("ITALIC", PdfFontFactory.createFont(fontProgram, PdfEncodings.WINANSI, true));
    }

    fontProvider.addFont(fontProgram);
}

TestVisualSummaryNew testVisualSummaryNew = new TestVisualSummaryNew();
NormalPageHeader headerHandler = testVisualSummaryNew.new NormalPageHeader(Paths.get("images").toAbsolutePath() + "\\logo.png", pdfFontMap);
pdfDoc.addEventHandler(PdfDocumentEvent.START_PAGE, headerHandler);
PageEndEvent pageEndEvent = testVisualSummaryNew.new PageEndEvent(Paths.get("images").toAbsolutePath() + "\\FooterLineExternal.png" ,pdfFontMap);
pdfDoc.addEventHandler(PdfDocumentEvent.END_PAGE, pageEndEvent);

doc = new Document(pdfDoc);
doc.setTopMargin(55);
PdfFormXObject xobject = sourcePage.copyAsFormXObject(pdfDoc);
Rectangle xobjectBoundaryBox = xobject.getBBox().toRectangle();
xobject.getPdfObject().put(PdfName.Matrix, new PdfArray(new float[] {1, 0, 0, 1, -xobjectBoundaryBox.getLeft(), -xobjectBoundaryBox.getBottom()}));
Image image = new Image(xobject);
image.setAutoScale(true);
doc.add(image);
System.out.println("Converted to PDF Succesfully >>> source.pdf");

Exception

com.itextpdf.kernel.PdfException: Document was closed. It is
impossible to execute action. at
com.itextpdf.kernel.pdf.PdfDocument.checkClosingStatus(PdfDocument.java:2041)
at
com.itextpdf.kernel.pdf.PdfDocument.getWriter(PdfDocument.java:706)
at
com.itextpdf.kernel.pdf.PdfIndirectReference.getWriter(PdfIndirectReference.java:270)
at com.itextpdf.kernel.pdf.PdfObject.copyTo(PdfObject.java:318) at
com.itextpdf.kernel.pdf.PdfPage.copyAsFormXObject(PdfPage.java:439)

Answer 1

As already indicated in comment to your previous question

You appear to already have closed the source document at that time. It mustn't be closed then to allow copying from it.

Thus, don't close it early, neither explicitly nor by creating it in a try-with-resources:

Document doc = null;
PdfDocument pdfDocument = null; //!!!
PdfPage sourcePage = null;
try (   InputStream resource = new FileInputStream(new File(Paths.get("Output").toAbsolutePath()+"/test.pdf"));    ) {  //!!!
   PdfReader pdfReader = new PdfReader(resource); //!!!
   pdfDocument = new PdfDocument(pdfReader); //!!!
   PdfDocumentContentParser contentParser = new PdfDocumentContentParser(pdfDocument);
   MarginFinder strategy = contentParser.processContent(1, new MarginFinder());

   sourcePage = pdfDocument.getPage(1);
   sourcePage.setCropBox(strategy.getBoundingBox());
   sourcePage.setMediaBox(strategy.getBoundingBox());
   //pdfDocument.close(); //!!!
}


try {
   @SuppressWarnings("resource")
   PdfWriter writer = new PdfWriter(new FileOutputStream(new File(Paths.get("Output").toAbsolutePath()+"/final.pdf"))).setSmartMode(true);
   PdfDocument pdfDoc = new PdfDocument(writer);
   pdfDoc.setDefaultPageSize(PageSize.A3.rotate());
   String fonts[] = {Paths.get("fonts").toAbsolutePath() + "/TREBUC.TTF", Paths.get("fonts").toAbsolutePath() + "/TREBUCBD.TTF", Paths.get("fonts").toAbsolutePath() + "/TREBUCBI.TTF",Paths.get("fonts").toAbsolutePath() + "/TREBUCIT.TTF"};
   FontProvider fontProvider = new FontProvider();
   Map<String, PdfFont> pdfFontMap = new HashMap<String, PdfFont>();
   for (String font : fonts) {
       FontProgram fontProgram = FontProgramFactory.createFont(font);
       if (font.endsWith("TREBUC.TTF")) {
           pdfFontMap.put("NORMAL", PdfFontFactory.createFont(fontProgram, PdfEncodings.WINANSI, true));
       } else if (font.endsWith("TREBUCBD.TTF")) {
           pdfFontMap.put("BOLD", PdfFontFactory.createFont(fontProgram, PdfEncodings.WINANSI, true));
       } else if (font.endsWith("TREBUCBI.TTF")) {
           pdfFontMap.put("BOLD_ITALIC", PdfFontFactory.createFont(fontProgram, PdfEncodings.WINANSI, true));
       } else if (font.endsWith("TREBUCIT.TTF")) {
           pdfFontMap.put("ITALIC", PdfFontFactory.createFont(fontProgram, PdfEncodings.WINANSI, true));
       }

       fontProvider.addFont(fontProgram);
   }

   TestVisualSummaryNew testVisualSummaryNew = new TestVisualSummaryNew();
   NormalPageHeader headerHandler = testVisualSummaryNew.new NormalPageHeader(Paths.get("images").toAbsolutePath() + "\\logo.png", pdfFontMap);
   pdfDoc.addEventHandler(PdfDocumentEvent.START_PAGE, headerHandler);
   PageEndEvent pageEndEvent = testVisualSummaryNew.new PageEndEvent(Paths.get("images").toAbsolutePath() + "\\FooterLineExternal.png" ,pdfFontMap);
   pdfDoc.addEventHandler(PdfDocumentEvent.END_PAGE, pageEndEvent);

   doc = new Document(pdfDoc);
   doc.setTopMargin(55);
   PdfFormXObject xobject = sourcePage.copyAsFormXObject(pdfDoc);
   Rectangle xobjectBoundaryBox = xobject.getBBox().toRectangle();
   xobject.getPdfObject().put(PdfName.Matrix, new PdfArray(new float[] {1, 0, 0, 1, -xobjectBoundaryBox.getLeft(), -xobjectBoundaryBox.getBottom()}));
   Image image = new Image(xobject);
   image.setAutoScale(true);
   doc.add(image);
   pdfDoc.close();
   doc.close();
   System.out.println("Converted to PDF Succesfully >>> convertedSvg_" + uuid + ".pdf");
} catch (Exception e) {
   e.printStackTrace();
   System.out.println("Error Occured while converting to PDF = " + e.getMessage());
}

pdfDocument.close();  //!!!