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https://issues.apache.org/jira/browse/PDFBOX-4631?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16909189#comment-16909189
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Tilman Hausherr commented on PDFBOX-4631:
-----------------------------------------
[~sjoblomj] please retry with this new version and check that your result file
is what you'd expect.
> NPE due to bounding box not being set on PDAppearanceStream
> -----------------------------------------------------------
>
> Key: PDFBOX-4631
> URL: https://issues.apache.org/jira/browse/PDFBOX-4631
> Project: PDFBox
> Issue Type: Bug
> Components: AcroForm
> Affects Versions: 2.0.16
> Environment: Windows 10
> Reporter: sjoblomj
> Priority: Major
> Fix For: 2.0.17, 3.0.0 PDFBox
>
> Attachments: PdfBoxTest.java, bidragsoknad_strange-content.pdf
>
>
> PDFBox 2.0.16 as well as the current SNAPSNOT version crashes with a
> NullPointerException. Attached is a small test that triggers the NPE, as well
> as the PDF.
> The stack trace:
> {code:java}
> java.lang.NullPointerException
> at
> org.apache.pdfbox.pdmodel.interactive.form.AppearanceGeneratorHelper.applyPadding(AppearanceGeneratorHelper.java:816)
> at
> org.apache.pdfbox.pdmodel.interactive.form.AppearanceGeneratorHelper.insertGeneratedCombAppearance(AppearanceGeneratorHelper.java:611)
> at
> org.apache.pdfbox.pdmodel.interactive.form.AppearanceGeneratorHelper.insertGeneratedAppearance(AppearanceGeneratorHelper.java:505)
> at
> org.apache.pdfbox.pdmodel.interactive.form.AppearanceGeneratorHelper.setAppearanceContent(AppearanceGeneratorHelper.java:374)
> at
> org.apache.pdfbox.pdmodel.interactive.form.AppearanceGeneratorHelper.setAppearanceValue(AppearanceGeneratorHelper.java:223)
> at
> org.apache.pdfbox.pdmodel.interactive.form.PDTextField.constructAppearances(PDTextField.java:264)
> at
> org.apache.pdfbox.pdmodel.interactive.form.PDTerminalField.applyChange(PDTerminalField.java:228)
> at
> org.apache.pdfbox.pdmodel.interactive.form.PDTextField.setValue(PDTextField.java:219)
> at PdfBoxTest.reformatFields(PdfBoxTest.java:67)
> at PdfBoxTest.flattenDocument(PdfBoxTest.java:52)
> at PdfBoxTest.flatten(PdfBoxTest.java:42)
> at PdfBoxTest.fileWithStrangeContent(PdfBoxTest.java:27){code}
>
> The origin of the error seems to be in
> {{AppearanceGeneratorHelper.setAppearanceValue()}}. A PDAppearanceStream is
> created, but a bounding box is only set for it if this is false: {{if
> (appearance != null && appearance.isStream())}}. In my case, the conditional
> is true, and PDFBox takes a path where no bounding box gets set.
> The following could be a solution, but I'm not very fluent in the inner
> workings of PDFs, and it's not directly obvious from looking at the code that
> this is a good approach.
> {code:java}
> diff --git
> a/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/interactive/form/AppearanceGeneratorHelper.java
>
> b/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/interactive/form/AppearanceGeneratorHelper.java
> index dc2825d4c..a82236069 100644
> ---
> a/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/interactive/form/AppearanceGeneratorHelper.java
> +++
> b/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/interactive/form/AppearanceGeneratorHelper.java
> @@ -201,6 +201,7 @@ class AppearanceGeneratorHelper
> if (appearance != null && appearance.isStream())
> {
> appearanceStream = appearance.getAppearanceStream();
> + setBoundingBoxOnAppearanceStream(widget,
> appearanceStream);
> }
> else
> {
> @@ -235,15 +236,9 @@ class AppearanceGeneratorHelper
> // Calculate the entries for the bounding box and the transformation
> matrix
> // settings for the appearance stream
> - int rotation = resolveRotation(widget);
> - PDRectangle rect = widget.getRectangle();
> - Matrix matrix = Matrix.getRotateInstance(Math.toRadians(rotation),
> 0, 0);
> - Point2D.Float point2D = matrix.transformPoint(rect.getWidth(),
> rect.getHeight());
> + setBoundingBoxOnAppearanceStream(widget, appearanceStream);
> - PDRectangle bbox = new PDRectangle(Math.abs((float) point2D.getX()),
> Math.abs((float) point2D.getY()));
> - appearanceStream.setBBox(bbox);
> -
> - AffineTransform at = calculateMatrix(bbox, rotation);
> + AffineTransform at = calculateMatrix(appearanceStream.getBBox(),
> resolveRotation(widget));
> if (!at.isIdentity())
> {
> appearanceStream.setMatrix(at);
> @@ -252,7 +247,17 @@ class AppearanceGeneratorHelper
> appearanceStream.setResources(new PDResources());
> return appearanceStream;
> }
> -
> +
> + private void setBoundingBoxOnAppearanceStream(PDAnnotationWidget widget,
> PDAppearanceStream appearanceStream) {
> + int rotation = resolveRotation(widget);
> + PDRectangle rect = widget.getRectangle();
> + Matrix matrix = Matrix.getRotateInstance(Math.toRadians(rotation),
> 0, 0);
> + Point2D.Float point2D = matrix.transformPoint(rect.getWidth(),
> rect.getHeight());
> +
> + PDRectangle bbox = new PDRectangle(Math.abs((float) point2D.getX()),
> Math.abs((float) point2D.getY()));
> + appearanceStream.setBBox(bbox);
> + }
> +
> private PDDefaultAppearanceString
> getWidgetDefaultAppearanceString(PDAnnotationWidget widget) throws IOException
> {
> COSString da = (COSString)
> widget.getCOSObject().getDictionaryObject(COSName.DA);
> {code}
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