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https://issues.apache.org/jira/browse/PDFBOX-2576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14385779#comment-14385779
 ] 

Tilman Hausherr commented on PDFBOX-2576:
-----------------------------------------

{code}
SCHWERWIEGEND: Error converting file Basiswissen-Vorschriften.pdf
java.lang.NullPointerException
        at 
org.apache.pdfbox.rendering.TilingPaint.getAnchorRect(TilingPaint.java:200)
        at 
org.apache.pdfbox.rendering.TilingPaint.getImage(TilingPaint.java:121)
        at org.apache.pdfbox.rendering.TilingPaint.<init>(TilingPaint.java:68)
        at org.apache.pdfbox.rendering.PageDrawer.getPaint(PageDrawer.java:209)
        at 
org.apache.pdfbox.rendering.PageDrawer.getNonStrokingPaint(PageDrawer.java:471)
        at org.apache.pdfbox.rendering.PageDrawer.fillPath(PageDrawer.java:526)
        at 
org.apache.pdfbox.contentstream.operator.graphics.FillNonZeroRule.process(FillNonZeroRule.java:36)
        at 
org.apache.pdfbox.contentstream.PDFStreamEngine.processOperator(PDFStreamEngine.java:829)
        at 
org.apache.pdfbox.contentstream.PDFStreamEngine.processStreamOperators(PDFStreamEngine.java:490)
        at 
org.apache.pdfbox.contentstream.PDFStreamEngine.processStream(PDFStreamEngine.java:456)
        at 
org.apache.pdfbox.contentstream.PDFStreamEngine.processPage(PDFStreamEngine.java:167)
        at org.apache.pdfbox.rendering.PageDrawer.drawPage(PageDrawer.java:147)
        at 
org.apache.pdfbox.rendering.PDFRenderer.renderPage(PDFRenderer.java:203)
        at 
org.apache.pdfbox.rendering.PDFRenderer.renderImage(PDFRenderer.java:136)
        at 
org.apache.pdfbox.rendering.PDFRenderer.renderImageWithDPI(PDFRenderer.java:81)
{code}


> Improve code quality
> --------------------
>
>                 Key: PDFBOX-2576
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-2576
>             Project: PDFBox
>          Issue Type: Task
>    Affects Versions: 2.0.0
>            Reporter: Tilman Hausherr
>            Assignee: John Hewson
>         Attachments: GraphicsOperatorProcessor.patch, 
> SecuryHandlerFactory.patch, org.apache.fontbox.afm.patch, 
> org.apache.fontbox.cff.cffparser.patch, org.apache.fontbox.cff.patch, 
> org.apache.fontbox.cmap.patch, 
> org.apache.pdfbox.contentstream.operator.state.patch, 
> org.apache.pdfbox.cos.patch, org.apache.pdfbox.filter-2.patch, 
> org.apache.pdfbox.filter.patch, org.apache.pdfbox.pdfwriter.COSWriter.patch, 
> org.apache.pdfbox.pdmodel.documentinterchange.logicalstructure.patch, 
> org.apache.pdfbox.pdmodel.documentinterchange.patch, 
> org.apache.pdfbox.preflight.graphic.patch, org.apache.pdfbox.resource.patch, 
> pdfbox-override-patch.txt, pdfbox-raw-type-patch.txt, 
> pdfcloneutility-patch.txt, pdftextstripperbyarea-patch.txt, 
> ttfsubsetter-2.patch, ttfsubsetter-3.patch, ttfsubsetter-patch.txt
>
>
> This is a longterm issue for the task to improve code quality, by using the 
> [SonarQube 
> report|https://analysis.apache.org/dashboard/index/org.apache.pdfbox:pdfbox-reactor],
>  hints in different IDEs, the FindBugs tool and other code quality tools.



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