[PDFBOX-4327] NullPointerException in PDFStreamEngine.processSoftMask() when running ExtractImages

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.11
• Fix Version/s: 2.0.13, 3.0.0 PDFBox
• Component/s: Utilities
• Assignee: Tilman Hausherr
• Reporter: Tilman Hausherr
• Created: 30/Sep/18 09:16
• Updated: 02/Dec/18 17:06
• Resolved: 05/Oct/18 17:03

Description

Exception in thread "main" java.lang.NullPointerException
        at org.apache.pdfbox.contentstream.PDFStreamEngine.processSoftMask(PDFStreamEngine.java:201)
        at org.apache.pdfbox.tools.ExtractImages$ImageGraphicsEngine.run(ExtractImages.java:207)
        at org.apache.pdfbox.tools.ExtractImages.extract(ExtractImages.java:182)
        at org.apache.pdfbox.tools.ExtractImages.run(ExtractImages.java:145)
        at org.apache.pdfbox.tools.ExtractImages.main(ExtractImages.java:90)
        at org.apache.pdfbox.tools.PDFBox.main(PDFBox.java:62)

The cause is that the ExtGState containing the softmask isn't assigned to the graphics state. Just assigning the softmask isn't enough (another NPE occurs) because the initial CTM (needed by a clone()) is only set when using copyIntoGraphicsState.