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https://issues.apache.org/jira/browse/PDFBOX-5471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17562125#comment-17562125
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Michael Klink commented on PDFBOX-5471:
---------------------------------------
Strictly speaking the missing *BBox* entry is an error. You may consider at
least logging a warning.
> NPE when Transparency Group is missing the BBox
> -----------------------------------------------
>
> Key: PDFBOX-5471
> URL: https://issues.apache.org/jira/browse/PDFBOX-5471
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.26
> Reporter: Henry Iguaro
> Priority: Major
> Fix For: 2.0.27, 3.0.0 PDFBox
>
> Attachments: getbbox-null.pdf, image-2022-07-04-14-55-28-527.png
>
>
> Some files contain transparency groups with no {{{}BBox{}}}. When this
> happens, PDFBox rendering code throws a {{NullPointerException}} in the
> {{TransparencyGroup}} constructor:
>
> {code:java}
> // transform the bbox
> GeneralPath transformedBox = form.getBBox().transform(transform);
> \_______/
> NPE when its null{code}
> The following is a screenshot taken from {{pdf-debugger}} when trying to open
> a file with has this issue:
> !image-2022-07-04-14-55-28-527.png!
> The stack trace:
> {code:java}
> java.lang.RuntimeException: java.util.concurrent.ExecutionException:
> java.lang.NullPointerException: Cannot invoke
> "org.apache.pdfbox.pdmodel.common.PDRectangle.transform(org.apache.pdfbox.util.Matrix)"
> because the return value of
> "org.apache.pdfbox.pdmodel.graphics.form.PDTransparencyGroup.getBBox()" is
> null
>
> org.apache.pdfbox.debugger.pagepane.PagePane$RenderWorker.done(PagePane.java:485)
>
> java.desktop/sun.swing.AccumulativeRunnable.run(AccumulativeRunnable.java:112)
>
> java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
>
> java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
> Caused by: java.util.concurrent.ExecutionException:
> java.lang.NullPointerException: Cannot invoke
> "org.apache.pdfbox.pdmodel.common.PDRectangle.transform(org.apache.pdfbox.util.Matrix)"
> because the return value of
> "org.apache.pdfbox.pdmodel.graphics.form.PDTransparencyGroup.getBBox()" is
> null
>
> org.apache.pdfbox.debugger.pagepane.PagePane$RenderWorker.done(PagePane.java:465)
>
> java.desktop/sun.swing.AccumulativeRunnable.run(AccumulativeRunnable.java:112)
>
> java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
>
> java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
> Caused by: java.lang.NullPointerException: Cannot invoke
> "org.apache.pdfbox.pdmodel.common.PDRectangle.transform(org.apache.pdfbox.util.Matrix)"
> because the return value of
> "org.apache.pdfbox.pdmodel.graphics.form.PDTransparencyGroup.getBBox()" is
> null
>
> org.apache.pdfbox.rendering.PageDrawer$TransparencyGroup.<init>(PageDrawer.java:1672)
>
> org.apache.pdfbox.rendering.PageDrawer$TransparencyGroup.<init>(PageDrawer.java:1637)
>
> org.apache.pdfbox.rendering.PageDrawer.showTransparencyGroupOnGraphics(PageDrawer.java:1575)
>
> org.apache.pdfbox.rendering.PageDrawer.showTransparencyGroup(PageDrawer.java:1553)
>
> org.apache.pdfbox.contentstream.operator.graphics.DrawObject.process(DrawObject.java:81)
>
> org.apache.pdfbox.contentstream.PDFStreamEngine.processOperator(PDFStreamEngine.java:966)
>
> org.apache.pdfbox.contentstream.PDFStreamEngine.processStreamOperators(PDFStreamEngine.java:541)
>
> org.apache.pdfbox.contentstream.PDFStreamEngine.processStream(PDFStreamEngine.java:516)
>
> org.apache.pdfbox.contentstream.PDFStreamEngine.processPage(PDFStreamEngine.java:155)
> org.apache.pdfbox.rendering.PageDrawer.drawPage(PageDrawer.java:279)
> org.apache.pdfbox.rendering.PDFRenderer.renderImage(PDFRenderer.java:355)
>
> org.apache.pdfbox.debugger.pagepane.PagePane$RenderWorker.doInBackground(PagePane.java:453)
>
> org.apache.pdfbox.debugger.pagepane.PagePane$RenderWorker.doInBackground(PagePane.java:435)
> java.base/java.lang.Thread.run(Thread.java:832)
> {code}
> The following is an example file that reproduces this problem:
> [^getbbox-null.pdf]
>
> A potential fix PR: https://github.com/apache/pdfbox/pull/145
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