[PDFBOX-4058] High memory consumption when extracting image from PDF file

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.5, 2.0.6, 2.0.7, 2.0.8
• Fix Version/s: 2.0.9, 3.0.0 PDFBox
• Component/s: Rendering
• Labels: regression
• Environment: windows 10 / Linux
• Assignee: Tilman Hausherr
• Reporter: Bjorn Misseghers
• Created: 08/Jan/18 15:19
• Updated: 24/Mar/18 09:41
• Resolved: 10/Jan/18 20:44

Description

When rendering an image at 300 dpi from the included PDF, my java process uses a huge amount of memory.
The document is only 45 Kb in size and contains 2 pages, my JVM is unable to extract even 1 page with 3G of memory. Setting Xmx to 4G works but is not the solution I want.
The error occurs when calling PDFRenderer.renderImageWithDPI()

I already tried tweaking the memory usage in my application to use a scratch file while loading the document as well as avoiding caching of XObjects as described here: https://pdfbox.apache.org/2.0/faq.html#outofmemoryerror
These didn't work.

The issue can be reproduced using the pdfbox-app utility:
java -Xmx3G -jar pdfbox-app-2.0.8.jar PDFToImage
HighMemoryFootprint.pdf -dpi 300 -color RGB -page 1

What can not be changed?

• 300 dpi will not be decreased.
• Max Java memory will not be increased: 3GB is ridiculous for a 45kb PDF file.

Issue Links

• relates to: PDFBOX-3688 Cache TilingPaint generation
• links to: JDK-4802550: java.util.WeakHashMap throws OutOfMemoryError on Linux