Tilman Hausherr created PDFBOX-3051:
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Summary: COSArray.getObject() incorrect handling of indirect
reference to COSNull
Key: PDFBOX-3051
URL: https://issues.apache.org/jira/browse/PDFBOX-3051
Project: PDFBox
Issue Type: Bug
Components: PDModel
Affects Versions: 1.8.10, 1.8.11, 2.0.0
Reporter: Tilman Hausherr
Assignee: Tilman Hausherr
Fix For: 1.8.11, 2.0.0
The attached (broken) file has this exception when displaying page 10:
{code}
java.lang.RuntimeException: java.util.concurrent.ExecutionException:
java.io.IOException: Error: Unknown annotation type COSNull{}
org.apache.pdfbox.debugger.pagepane.PagePane$RenderWorker.done(PagePane.java:175)
sun.swing.AccumulativeRunnable.run(Unknown Source)
java.security.AccessController.doPrivileged(Native Method)
java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
Caused by: java.util.concurrent.ExecutionException: java.io.IOException: Error:
Unknown annotation type COSNull{}
org.apache.pdfbox.debugger.pagepane.PagePane$RenderWorker.done(PagePane.java:164)
sun.swing.AccumulativeRunnable.run(Unknown Source)
java.security.AccessController.doPrivileged(Native Method)
java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
Caused by: java.io.IOException: Error: Unknown annotation type COSNull{}
org.apache.pdfbox.pdmodel.interactive.annotation.PDAnnotation.createAnnotation(PDAnnotation.java:164)
org.apache.pdfbox.pdmodel.PDPage.getAnnotations(PDPage.java:664)
org.apache.pdfbox.rendering.PageDrawer.drawPage(PageDrawer.java:181)
org.apache.pdfbox.rendering.PDFRenderer.renderPage(PDFRenderer.java:208)
org.apache.pdfbox.rendering.PDFRenderer.renderImage(PDFRenderer.java:139)
org.apache.pdfbox.rendering.PDFRenderer.renderImage(PDFRenderer.java:68)
org.apache.pdfbox.debugger.pagepane.PagePane$RenderWorker.doInBackground(PagePane.java:155)
org.apache.pdfbox.debugger.pagepane.PagePane$RenderWorker.doInBackground(PagePane.java:138)
java.lang.Thread.run(Unknown Source)
{code}
The cause is this code:
{code}
public COSBase getObject( int index )
{
Object obj = objects.get( index );
if( obj instanceof COSObject )
{
obj = ((COSObject)obj).getObject();
}
else if( obj instanceof COSNull )
{
obj = null;
}
return (COSBase)obj;
}
{code}
i.e. a COSObject that points to a COSNull object isn't returned as null, but as
COSNull. COSDictionary.getDictionaryObject() does not have this bug.
Solution: remove the "else".
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