Maruan Sahyoun created PDFBOX-4185:
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Summary: 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: 2.0.9, 2.0.4, 3.0.0 PDFBox
Reporter: Maruan Sahyoun
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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