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https://issues.apache.org/jira/browse/PDFBOX-4751?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andreas Lehmkühler reopened PDFBOX-4751:
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> Removing field / annotation does not work
> -----------------------------------------
>
> Key: PDFBOX-4751
> URL: https://issues.apache.org/jira/browse/PDFBOX-4751
> Project: PDFBox
> Issue Type: Bug
> Components: AcroForm
> Affects Versions: 2.0.18
> Environment: macOS Mojave 10.14.6
> Reporter: Jesse
> Assignee: Maruan Sahyoun
> Priority: Minor
> Fix For: 2.0.20, 3.0.0 PDFBox
>
>
> After upgrading to `2.0.18`, the following code doesn't work for me anymore:
> {code:java}
> private void removeField() throws IOException {
> PDAcroForm form = this.field.getAcroForm();
> List<PDField> allFields = form.getFields();
> PDAnnotationWidget widget = field.getWidgets().get(0);
> List<PDAnnotation> allAnnotations = widget.getPage().getAnnotations();
> System.out.println("BEFORE: Fields size: " + allFields.size() + "; Field
> to array: " + COSArrayList.converterToCOSArray(allFields));
> for(PDField field : allFields) {
> if
> (field.getFullyQualifiedName().equals(this.field.getFullyQualifiedName())) {
> allFields.remove(field);
> break;
> }
> }
> System.out.println("AFTER: Fields size: " + allFields.size() + "; Field
> to array: " + COSArrayList.converterToCOSArray(allFields));
> System.out.println("BEFORE: Annots size: " + allAnnotations.size() + ";
> Annots to array: " + COSArrayList.converterToCOSArray(allAnnotations));
> for(PDAnnotation annotation : allAnnotations) {
> if(annotation.getCOSObject().equals(widget.getCOSObject())) {
> allAnnotations.remove(annotation);
> break;
> }
> }
> System.out.println("AFTER: Annots size: " + allAnnotations.size() + ";
> Annots to array: " + COSArrayList.converterToCOSArray(allAnnotations));
> }
> {code}
> For whatever reason, the array in `COSArrayList` is not updating. The
> internal `ArrayList` is updating, but not the internal `COSArray`. Here is
> some output from above that might helpful after trying to remove a field from
> a pdf with a single field.
> {code:java}
> // 2.0.17
> BEFORE: Fields size: 1; Field to array: COSArray{[COSObject{10, 0}]}
> AFTER: Fields size: 0; Field to array: COSArray{[]}
> BEFORE: Annots size: 1; Annots to array: COSArray{[COSObject{10, 0}]}
> AFTER: Annots size: 0; Annots to array: COSArray{[]}
> // 2.0.18
> BEFORE: Fields size: 1; Field to array: COSArray{[COSObject{10, 0}]}
> AFTER: Fields size: 0; Field to array: COSArray{[COSObject{10, 0}]}
> BEFORE: Annots size: 1; Annots to array: COSArray{[COSObject{10, 0}]}
> AFTER: Annots size: 0; Annots to array: COSArray{[COSObject{10, 0}]}
> {code}
> I can definitely attach one of the PDFs I was working with if needed... But
> this was happening with every PDF I tried it on, so I don't think it's
> something special about the pdfs I was working with.
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