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https://issues.apache.org/jira/browse/PDFBOX-2087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17924885#comment-17924885
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Tilman Hausherr commented on PDFBOX-2087:
-----------------------------------------
I tried to reproduce this but there was missing information. I should have
looked into the source code first. There was an NPE potential if a page had no
contents. This was fixed in 2.0 because {{page.getContents()}} never returns
null. In 1.8 it would return null (still in the 1.8 repository).
> Using the LayerUtil on Documents which contains empty pages, results in an
> NullPointer exception.
> -------------------------------------------------------------------------------------------------
>
> Key: PDFBOX-2087
> URL: https://issues.apache.org/jira/browse/PDFBOX-2087
> Project: PDFBox
> Issue Type: Bug
> Components: Utilities
> Affects Versions: 1.8.2
> Environment: • Win7
> • C#, VS2010
> • Pdfbox-1.8.2 (current release available via nu-get)
> Reporter: Stefan Schubert
> Priority: Minor
> Attachments: PDFBOX2087.java
>
>
> First: Thanks a lot for maintaining PDFBox, it’s really great and helped us a
> lot in our project!
> h4. Business-Context:
> I have to apply stationery paper to a document while considering an exclusion
> list. I.e. on some pages the stationery paper
> is not to be applied.
> h4. Code-Sniplet (Which Leads to the NPE):
> {code:none}
> // preparing a new document containing the stationery paper and pages without
> it
> _targetDocument = new PDDocument();
> var emptyPage = new PDPage();
> emptyPage.setMediaBox(PDPage.PAGE_SIZE_A4);
> …..
> for (int i = 1; i <= destinationPageCount; i++)
> {
> if (_exclusionPages.Contains(i))
> {
> _targetDocument.importPage(emptyPage);
> }
> else
> {
> _targetDocument.importPagestationeryPage);
> }
> }
> // now adding the original documents text via layer Util like this
> /// <summary>
> /// Create a document with the stationery paper in the background
> /// and the text as a layer in the foreground.
> /// </summary>
> private void AddDocumentPagesAsLayerToTargetDocument()
> {
> LayerUtility layerUtil = new LayerUtility(_targetDocument);
> var transform = new AffineTransform();
> var backgroundPages =
> _targetDocument.getDocumentCatalog().getAllPages();
> for (int pageIndex = 0; pageIndex < backgroundPages.size();
> pageIndex++)
> {
> PDXObjectForm textPdfPageAsForm =
> layerUtil.importPageAsForm(_pdfDocument, pageIndex);
> PDPage targetPage = (PDPage)backgroundPages.get(pageIndex);
> layerUtil.appendFormAsLayer(targetPage, textPdfPageAsForm,
> transform, String.Format("ContentPage_{0:000}", pageIndex));
> }
> }
> {code}
> h4. Current-Workaround:
> Creating a content stream on the empty page and printing something invisible
> on it.
> Once again thanks a lot for maintaining PDFBox.
> Best greetings from Cologne/Germany
> Stefan Schubert
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