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https://issues.apache.org/jira/browse/PDFBOX-5720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17790660#comment-17790660
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Andreas Lehmkühler commented on PDFBOX-5720:
--------------------------------------------
The parser is aware if the source is already closed. Something like the
following stacktrace occurs if one tries to access objects which aren't
dereferenced before closing the pdf
{code}
28.11.2023 17:36:49 ERROR cos.COSObject:126 - Can't dereference COSObject{51, 0}
java.io.IOException: RandomAccessBuffer already closed
at
org.apache.pdfbox.io.RandomAccessReadBuffer.checkClosed(RandomAccessReadBuffer.java:346)
~[classes/:?]
at
org.apache.pdfbox.io.RandomAccessReadBuffer.getPosition(RandomAccessReadBuffer.java:196)
~[classes/:?]
at
org.apache.pdfbox.pdfparser.COSParser.dereferenceCOSObject(COSParser.java:622)
~[classes/:?]
at org.apache.pdfbox.cos.COSObject.getObject(COSObject.java:121)
~[classes/:?]
at
org.apache.pdfbox.cos.COSDictionary.getDictionaryObject(COSDictionary.java:186)
~[classes/:?]
at
org.apache.pdfbox.cos.COSDictionary.getCOSDictionary(COSDictionary.java:551)
~[classes/:?]
at
org.apache.pdfbox.pdmodel.PDDocumentCatalog.getAcroForm(PDDocumentCatalog.java:142)
~[classes/:?]
at
org.apache.pdfbox.pdmodel.fixup.processor.AcroFormDefaultsProcessor.process(AcroFormDefaultsProcessor.java:55)
~[classes/:?]
at
org.apache.pdfbox.pdmodel.fixup.AcroFormDefaultFixup.apply(AcroFormDefaultFixup.java:34)
~[classes/:?]
at
org.apache.pdfbox.pdmodel.PDDocumentCatalog.getAcroForm(PDDocumentCatalog.java:132)
~[classes/:?]
at
org.apache.pdfbox.pdmodel.PDDocumentCatalog.getAcroForm(PDDocumentCatalog.java:113)
~[classes/:?]
at
org.apache.pdfbox.pdmodel.interactive.form.PDAcroFormTest.testCheckedState(PDAcroFormTest.java:85)
~[test-classes/:?]
.....
{code}
> Checked state of PDCheckbox
> ---------------------------
>
> Key: PDFBOX-5720
> URL: https://issues.apache.org/jira/browse/PDFBOX-5720
> Project: PDFBox
> Issue Type: Bug
> Components: AcroForm
> Affects Versions: 3.0.0 PDFBox
> Reporter: Michael Bädorf
> Priority: Major
> Attachments: ticket.pdf
>
>
> Before v3.0.0 is was possible to get the selected state simply by using the
> isChecked() function. After updating to v.3.0.0 the function always returns
> false with the same input PDF that works well til v2.0.30.
> There are no migration advices so I think this is a bug.
> This is the code I use for filtering selected checkboxes. but now always
> returns an empty list (in contrast to v2.0.30)
> {{{color:#000080}private {color}List<PDField>
> filterCheckedCheckboxes(List<PDField> fields) {}}
> {{ {color:#000080}return {color}filterByType(fields,
> PDCheckBox.{color:#000080}class{color})}}
> {{ .stream()}}
> {{ .filter(PDCheckBox::isChecked)}}
> {{ .map(PDField.{color:#000080}class{color}::cast)}}
> {{ .toList();}}
> }
>
> I can also find no test for PDCheckBox.isChecked()
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