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https://issues.apache.org/jira/browse/PDFBOX-743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12876232#action_12876232
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Johannes Koch commented on PDFBOX-743:
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According to PDF 32000-1:2008 (PDF 1.7), table 168, page 389, the N entry is
required in an appearance dictionary. So an appearance dictionary without an N
entry is erroneous. Should getNormalAppearance() return null in this case?
> PDAppereanceDictionary#getNormalAppearance might throw NPE
> ----------------------------------------------------------
>
> Key: PDFBOX-743
> URL: https://issues.apache.org/jira/browse/PDFBOX-743
> Project: PDFBox
> Issue Type: Bug
> Components: PDModel
> Affects Versions: 1.1.0
> Reporter: Philipp Koch
> Fix For: 1.2.0
>
>
> following code patch will ensure that no NPE is thrown. the question is if
> the check for NULL is done at the correct place (functionally yes)
> respectively is it correct to apply the default configuration setting for
> that case?
> @@ -85,7 +85,7 @@
> public Map getNormalAppearance()
> {
> COSBase ap = dictionary.getDictionaryObject( COSName.getPDFName( "N"
> ) );
> - if( ap instanceof COSStream )
> + if( ap instanceof COSStream || ap == null)
> {
> COSStream aux = (COSStream) ap;
> ap = new COSDictionary();
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