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https://issues.apache.org/jira/browse/PDFBOX-4185?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Maruan Sahyoun resolved PDFBOX-4185.
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Resolution: Fixed
resolved. Thanks [~matthias.gall] for the report and your tests.
> Fetching options for PDChoice causes ClassCastException
> --------------------------------------------------------
>
> Key: PDFBOX-4185
> URL: https://issues.apache.org/jira/browse/PDFBOX-4185
> Project: PDFBox
> Issue Type: Bug
> Components: AcroForm
> Affects Versions: 2.0.4, 2.0.9, 3.0.0 PDFBox
> Reporter: Maruan Sahyoun
> Assignee: Maruan Sahyoun
> Priority: Major
> Fix For: 2.0.10, 3.0.0 PDFBox
>
>
> I am trying to fetch the options available for a PDChoice field in a form but
> get a ClassCastException from the PDFBox internals.
> The problematic PDF is an Inheritance Tax form from the UK's Revenue and
> Customs, specifically I am currently looking at IHT405:
> https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/697346/IHT405_online.pdf
> I use this code to iterate over the fields:
> {code}
> PDDocument doc = PDDocument.load(resource.getFile());
> PDDocumentCatalog catalog = doc.getDocumentCatalog();
> PDAcroForm form = catalog.getAcroForm();
> for (PDField field : form.getFields()) {
> if ("Ch".equals(field.getFieldType())) {
> PDChoice choice = (PDChoice) field;
> // All these variants fail with a ClassCastException:
> choice.getOptions();
> choice.getOptionsDisplayValues();
> choice.getOptionsExportValues(); // internally just
> delegates to getOptions()
> }
> }
> {code}
> This is a stacktrace for e.g. the getOptionsExportValues() call:
> {noformat}
> java.lang.ClassCastException: org.apache.pdfbox.cos.COSArray cannot be
> cast to org.apache.pdfbox.cos.COSString
> at
> org.apache.pdfbox.pdmodel.common.COSArrayList.convertCOSStringCOSArrayToList(COSArrayList.java:367)
> at
> org.apache.pdfbox.pdmodel.interactive.form.FieldUtils.getPairableItems(FieldUtils.java:182)
> at
> org.apache.pdfbox.pdmodel.interactive.form.PDChoice.getOptions(PDChoice.java:91)
> at
> org.apache.pdfbox.pdmodel.interactive.form.PDChoice.getOptionsExportValues(PDChoice.java:210)
> {noformat}
> The problem is that the expected "stringArray" also contains COSArrays with
> value and label for the options:
> {noformat}
> COSArray{[COSString{ }, COSArray{[COSString{Mr}, COSString{MR}]},
> COSArray{[COSString{Mrs}, COSString{MRS}]}, COSArray{[COSString{Miss},
> COSString{MISS}]}, COSArray{[COSString{Ms}, COSString{MS}]}]}
> {noformat}
> This does not seem to be expected in FieldUtils.getPairableItems, which
> introspects only the first item of the array and thus treats the array as an
> array of strings.
> I found the bug with PDFBox 2.0.4 and upgraded to 2.0.9 which didn't help.
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