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https://issues.apache.org/jira/browse/PDFBOX-6179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18067224#comment-18067224
]
Tilman Hausherr edited comment on PDFBOX-6179 at 3/21/26 5:37 AM:
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Here's some code that assumes the equals is there (I added it locally, similar
to PDAnnotation) and also does a recursion. I haven't tested it on a file with
a multilevel real field tree, I'll do that when I have more time.
{code:java}
public class RemoveField
{
public static void main(String[] args) throws IOException
{
String name = "XXXX";
String dir = ....
try (PDDocument doc = Loader.loadPDF(new File(dir,
"PDFBOX-6179-form.pdf")))
{
PDAcroForm acroForm = doc.getDocumentCatalog().getAcroForm();
PDField field = acroForm.getField(name);
if (field == null)
{
System.out.println("field not found");
doc.close();
return;
}
List<PDField> fields = acroForm.getFields(); // returns only top
level
boolean removed = fields.remove(field);
if (!removed)
{
removed = removeRecursive(fields, field);
}
if (removed)
{
// find page(s)
List<PDAnnotationWidget> widgets = field.getWidgets();
for (PDAnnotationWidget widget : widgets)
{
PDPage page = widget.getPage(); // not always set - we may
need to go through all pages
if (page != null)
{
List<PDAnnotation> annotations = page.getAnnotations();
removed = annotations.remove(widget);
System.out.println("page widget removed? " + removed);
}
}
}
if (removed)
{
System.out.println("field removed? " + removed);
doc.save(new File(dir, "PDFBOX-6179-form-saved.pdf"));
}
}
}
private static boolean removeRecursive(List<PDField> fields, PDField field)
{
// search the tree
for (PDField fieldItem : fields)
{
if (fieldItem instanceof PDNonTerminalField)
{
PDNonTerminalField ntField = (PDNonTerminalField) fieldItem;
List<PDField> children = ntField.getChildren();
if (children.remove(field))
{
ntField.setChildren(children);
return true;
}
if (removeRecursive(children, field))
{
return true;
}
}
}
return false;
}
}
{code}
was (Author: tilman):
Here's some code that assumes the equals is there (I added it locally, similar
to PDAnnotations) and also does a recursion. I haven't tested it on a file with
a multilevel real field tree, I'll do that when I have more time.
{code:java}
public class RemoveField
{
public static void main(String[] args) throws IOException
{
String name = "XXXX";
String dir = ....
try (PDDocument doc = Loader.loadPDF(new File(dir,
"PDFBOX-6179-form.pdf")))
{
PDAcroForm acroForm = doc.getDocumentCatalog().getAcroForm();
PDField field = acroForm.getField(name);
if (field == null)
{
System.out.println("field not found");
doc.close();
return;
}
List<PDField> fields = acroForm.getFields(); // returns only top
level
boolean removed = fields.remove(field);
if (!removed)
{
removed = removeRecursive(fields, field);
}
if (removed)
{
// find page(s)
List<PDAnnotationWidget> widgets = field.getWidgets();
for (PDAnnotationWidget widget : widgets)
{
PDPage page = widget.getPage(); // not always set - we may
need to go through all pages
if (page != null)
{
List<PDAnnotation> annotations = page.getAnnotations();
removed = annotations.remove(widget);
System.out.println("page widget removed? " + removed);
}
}
}
if (removed)
{
System.out.println("field removed? " + removed);
doc.save(new File(dir, "PDFBOX-6179-form-saved.pdf"));
}
}
}
private static boolean removeRecursive(List<PDField> fields, PDField field)
{
// search the tree
for (PDField fieldItem : fields)
{
if (fieldItem instanceof PDNonTerminalField)
{
PDNonTerminalField ntField = (PDNonTerminalField) fieldItem;
List<PDField> children = ntField.getChildren();
if (children.remove(field))
{
ntField.setChildren(children);
return true;
}
if (removeRecursive(children, field))
{
return true;
}
}
}
return false;
}
}
{code}
> Removing fields not possible
> ----------------------------
>
> Key: PDFBOX-6179
> URL: https://issues.apache.org/jira/browse/PDFBOX-6179
> Project: PDFBox
> Issue Type: Bug
> Components: AcroForm
> Affects Versions: 3.0.7 PDFBox
> Reporter: Stefan Ziegler
> Priority: Major
> Attachments: simple_form.pdf
>
>
> Seems that fields can no longer be removed like this:
> PDField field = acroForm.getField("XXXXX");
> List<PDField> fields = acroForm.getFields();
> fields.remove(field);
> Internally, the field is never found. PDField has no equals method. getField
> and getFields create new PDField instances and so equals fails in this case.
> Shouldn't there be an equals method in PDField, that compares the underlying
> COSObject?
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