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https://issues.apache.org/jira/browse/PDFBOX-4149?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16394573#comment-16394573
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Tilman Hausherr edited comment on PDFBOX-4149 at 3/11/18 5:05 PM:
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There is some hope to get the total time down a bit... tests with the profiler 
show that the time is lost in several areas. One thing I noticed is that the 
colorspaces are all based on the same ICC colorspace, yet this colorspace is 
created again and again.


was (Author: tilman):
There is some hope to get the total time down a bit... tests with the profiler 
show that the time is lost in several areas. One Thing I noticed is that the 
colorspaces are all based on the same ICC colorspace, yet this colorspace is 
created again and again.

> PDF consisting on one page with 5 MB renders until the end of time using 
> renderImageWithDPI
> -------------------------------------------------------------------------------------------
>
>                 Key: PDFBOX-4149
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-4149
>             Project: PDFBox
>          Issue Type: Bug
>          Components: Rendering
>    Affects Versions: 2.0.8
>            Reporter: Christian
>            Priority: Major
>         Attachments: SB_Flyer_SpargelPromo_03-062018.pdf
>
>
> I am using PDFBOX 2.0.8 on a Java VM 1.8.0_151
> The attached and valid pdf should be rendered by calling
> BufferedImage bim = pdfRenderer.renderImageWithDPI(i, 50);
> But the rendering never ends - the only thing I see is this line repeating 
> very often in the console:
> [Finalizer] DEBUG org.apache.pdfbox.io.ScratchFileBuffer - ScratchFileBuffer 
> not closed!
> Here is the code that is used to open the document and then start the 
> rendering:
> {code:java}
> PDDocument document = PDDocument.load(file, 
> MemoryUsageSetting.setupTempFileOnly());
> try  {
>    PDFRenderer pdfRenderer = new PDFRenderer(document);
>    int numberOfPages = document.getPages().getCount();
>    for (int i = 0; i < numberOfPages; i++) {
>       BufferedImage bim = pdfRenderer.renderImageWithDPI(i, 50);
> [...]
> {code}
> The line 
> BufferedImage bim = pdfRenderer.renderImageWithDPI(i, 50); 
> is never passed. I ran a test and have wait for 30 minutes to let it pass, 
> but nothing happens. 
> Please advise what to do and how to solve the issue.



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