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https://issues.apache.org/jira/browse/PDFBOX-6207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18084024#comment-18084024
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Maruan Sahyoun commented on PDFBOX-6207:
----------------------------------------
Initial analysis
Instead of using an array in the pdf a string is being used for the /Opt entry.
This is not correct.
{code}
17 0 obj
<<
/FT /Btn
/Kids [61 0 R]
/Opt ()
/T (Checkbox_unten#2)
/TU (Checkbox_unten#2)
/V /Off
>>
endobj
{code}
{quote}
"... If present, the Opt entry shall be an array of text strings representing
the export value of each annotation in the field. ..."
{quote}
We are handling an empty array but we are currently not handling a
string.
> Setting checkbox value fails when field has an invalid /Opt entry
> -----------------------------------------------------------------
>
> Key: PDFBOX-6207
> URL: https://issues.apache.org/jira/browse/PDFBOX-6207
> Project: PDFBox
> Issue Type: Improvement
> Components: AcroForm
> Affects Versions: 2.0.36, 3.0.7 PDFBox, 4.0.0
> Reporter: Maruan Sahyoun
> Assignee: Maruan Sahyoun
> Priority: Major
>
> from the users mailing list:
> SUMMARY
> When a checkbox field in an AcroForm PDF contains an empty /Opt array (/Opt
> []) in its field dictionary, calling PDCheckBox.setValue("Yes") throws an
> IllegalArgumentException, even though "Yes" is a perfectly valid export value
> defined by the field's appearance states.
> The same field can be checked and unchecked without any error using Adobe
> Acrobat products (Acrobat Reader, Acrobat Pro), which treat the empty /Opt
> array as if it were absent. This confirms that the PDF is valid and the issue
> is specific to PDFBox's validation logic.
> ERROR MESSAGE
> java.lang.IllegalArgumentException: value 'Yes' is not a valid option for the
> field Check_Info_Post_andere, valid values are: [] and Off
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