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https://issues.apache.org/jira/browse/PDFBOX-2849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14610463#comment-14610463
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Tilman Hausherr commented on PDFBOX-2849:
-----------------------------------------

A classic "design by committee" fingerprint :-)

> implement appearance generation for buttons
> -------------------------------------------
>
>                 Key: PDFBOX-2849
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-2849
>             Project: PDFBox
>          Issue Type: Sub-task
>          Components: AcroForm
>    Affects Versions: 2.0.0
>            Reporter: Tilman Hausherr
>             Fix For: 2.0.0
>
>         Attachments: TestTemplate.pdf
>
>
> This code
> {code}
> PDField newField = 
> tplDoc.getDocumentCatalog().getAcroForm().getField("01.20.Entry1");
> PDCheckbox newCheckBoxField = (PDCheckbox) newField;
> newCheckBoxField.check();
> {code}
> brings this exception:
> {code}
> Exception in thread "main" java.lang.UnsupportedOperationException: not 
> implemented
>       at 
> org.apache.pdfbox.pdmodel.interactive.form.PDButton.constructAppearances(PDButton.java:225)
>       at 
> org.apache.pdfbox.pdmodel.interactive.form.PDTerminalField.applyChange(PDTerminalField.java:220)
>       at 
> org.apache.pdfbox.pdmodel.interactive.form.PDCheckbox.setValue(PDCheckbox.java:128)
>       at 
> org.apache.pdfbox.pdmodel.interactive.form.PDCheckbox.check(PDCheckbox.java:71)
> {code}
> what did work is this:
> {code}
> newCheckBoxField.getCOSObject().setItem(COSName.V, vValue);
> newCheckBoxField.getCOSObject().setItem(COSName.AS, asValue);
> {code}



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