[PDFBOX-2925] EmptyStackException in PDFStreamEngine.getColorSpaces

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.8.10
• Fix Version/s: 1.8.11
• Component/s: Preflight
• Assignee: Tilman Hausherr
• Reporter: Tilman Hausherr
• Created: 08/Aug/15 06:17
• Updated: 18/Jan/16 12:01
• Resolved: 08/Aug/15 06:22

Description

From Abel S. in the user mailing list:

I'm testing prawn generated PDFs (https://github.com/prawnpdf/prawn) and I have found that when trying to validate them with PreflightParser, I get an unchecked exception instead of an expected org.apache.pdfbox.preflight.exception.ValidationException.

I attach the PDF (example-manual.pdf) and here is the stacktrace:

Exception in thread "main" java.util.EmptyStackException
	at java.util.Stack.peek(Stack.java:102)
	at org.apache.pdfbox.util.PDFStreamEngine.getColorSpaces(PDFStreamEngine.java:579)
	at org.apache.pdfbox.util.operator.SetNonStrokingColorSpace.process(SetNonStrokingColorSpace.java:50)
	at org.apache.pdfbox.preflight.content.ContentStreamWrapper.processOperator(ContentStreamWrapper.java:162)
	at org.apache.pdfbox.util.PDFStreamEngine.processSubStream(PDFStreamEngine.java:268)
	at org.apache.pdfbox.util.PDFStreamEngine.processSubStream(PDFStreamEngine.java:244)
	at org.apache.pdfbox.preflight.content.ContentStreamWrapper.validXObjContentStream(ContentStreamWrapper.java:100)
	at org.apache.pdfbox.preflight.xobject.XObjFormValidator.validateXObjectContent(XObjFormValidator.java:113)
	at org.apache.pdfbox.preflight.xobject.XObjFormValidator.validate(XObjFormValidator.java:76)
	at org.apache.pdfbox.preflight.process.reflect.GraphicObjectPageValidationProcess.validate(GraphicObjectPageValidationProcess.java:77)
	at org.apache.pdfbox.preflight.utils.ContextHelper.callValidation(ContextHelper.java:81)
	at org.apache.pdfbox.preflight.utils.ContextHelper.validateElement(ContextHelper.java:54)
	at org.apache.pdfbox.preflight.process.reflect.ResourcesValidationProcess.validateXObjects(ResourcesValidationProcess.java:191)
	at org.apache.pdfbox.preflight.process.reflect.ResourcesValidationProcess.validate(ResourcesValidationProcess.java:78)
	at org.apache.pdfbox.preflight.utils.ContextHelper.callValidation(ContextHelper.java:81)
	at org.apache.pdfbox.preflight.utils.ContextHelper.validateElement(ContextHelper.java:54)
	at org.apache.pdfbox.preflight.process.reflect.SinglePageValidationProcess.validateResources(SinglePageValidationProcess.java:163)
	at org.apache.pdfbox.preflight.process.reflect.SinglePageValidationProcess.validate(SinglePageValidationProcess.java:82)
	at org.apache.pdfbox.preflight.utils.ContextHelper.callValidation(ContextHelper.java:81)
	at org.apache.pdfbox.preflight.utils.ContextHelper.validateElement(ContextHelper.java:54)
	at org.apache.pdfbox.preflight.process.PageTreeValidationProcess.validatePage(PageTreeValidationProcess.java:58)
	at org.apache.pdfbox.preflight.process.PageTreeValidationProcess.validate(PageTreeValidationProcess.java:47)
	at org.apache.pdfbox.preflight.utils.ContextHelper.callValidation(ContextHelper.java:81)
	at org.apache.pdfbox.preflight.utils.ContextHelper.validateElement(ContextHelper.java:96)
	at org.apache.pdfbox.preflight.PreflightDocument.validate(PreflightDocument.java:168)