Please retry with the current version 2.0.23. Why did you try with 2.0.5? It is four years old.
Tilman --- Original-Nachricht --- Von: Forgács Péter Betreff: Possible NPE when merging a PDF with fillable fields Datum: 08. Juni 2021, 13:04 An: [email protected] Hello One of our users in production received an error with the following stack trace: java.lang.NullPointerException at org.apache.pdfbox.multipdf.PDFMergerUtility.mergeAcroForm(PDFMergerUtility.java:678) at org.apache.pdfbox.multipdf.PDFMergerUtility.appendDocument(PDFMergerUtility.java:366) at org.apache.pdfbox.multipdf.PDFMergerUtility.mergeDocuments(PDFMergerUtility.java:261) … Relevant code from our side is: ... try (ByteArrayOutputStream out = new ByteArrayOutputStream()) { PDFMergerUtility mergerUtility = new PDFMergerUtility(); mergerUtility.addSource(new ByteArrayInputStream(pdfFileByteArray); mergerUtility.addSource(new ByteArrayInputStream(anotherPdfFileByteArray); mergerUtility.setDestinationStream(out); mergerUtility.mergeDocuments(MemoryUsageSetting.setupTempFileOnly()); ... Digging into the code, I think I have a suspicion of what could be the issue. ... COSArray destFields = (COSArray) destAcroForm.getCOSObject().getItem(COSName.FIELDS); for (PDField srcField : srcAcroForm.getFieldTree()) { ... destFields.add(dstField); // exception happens here } ... destfields is null because the destination COSObject/Dictionary has no Fields key, but the source does. The destination pdf file is created earlier in the PDDocument constructor, but the CosName.FIELDS is not added to it. Is this a bug, or an improper usage of the PDFBox? We are using PDFBox 2.0.1. The closest issue I could find was this: https://issues.apache.org/jira/browse/PDFBOX-3663 <https://issues.apache.org/jira/browse/PDFBOX-3663> I updated PDFBox to 2.0.5 and checked the code after the update, but it seems the constructor still does not set that value. Kind Regards, Forgács Péter Junior Java Developer [Appello logo] Madách Trade Center, A building, 2. floor H-1075 Budapest, Madách Imre út 13-14. Tel: +36 1 474 0915 [email protected] www.appello.eu <http://www.appello.eu> <https://www.linkedin.com/company/appello---banking-it> <https://www.facebook.com/ApPello-Banking-Software-1500303710198451/> [finovateeurope2019_banner4] <https://appello.eu/appello-demo-presentation-at-finovate-europe-2019/>
