[PDFBOX-4943] PDF Merge of large document, memory usage?

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Not A Bug
• Affects Version/s: 2.0.21
• Component/s: Utilities
• Environment: Windows, java x64
• Assignee: Unassigned
• Reporter: Richard Stafford
• Created: 28/Aug/20 13:00
• Updated: 25/Sep/20 04:18
• Resolved: 25/Sep/20 04:18

Description

We are trying to use the PDFMergerUtility to merge a number of PDF files, but are having an issue with exhausting java heap with a specific PDF file.  This file is about 50mb, but merging with it requires a java heap of 8gb.  We've tried using setupTempFileOnly() but that doesn't seem to help. 

Looking further, just doing a PDDocument.load() operation for this file uses 3.5gb of heap, regardless of MemoryUsageSetting() values.

For instance, with the following main()

public static void main(String arg[]) public static void main(String arg[])

{ try

   

{ // load the document         PDDocument sourceDoc = PDDocument.load( new File("c:\\tmp\\testfile.PDF"),                           MemoryUsageSetting.setupTempFileOnly().setTempDir(new File("c:\\tmp")) );         sourceDoc.close(); LogMessage.log( "Completed");     }

  catch (Exception e)

 

{   LogMessage.log( "Exception in document load: "+e.toString());   }

}

Setting a breakpoint at the sourceDoc.close(), the heap has increased to 3.5gb.

 

Our test case can be downloaded from:

https://s3.amazonaws.com/webdl.equorum.com/misc/testfile.pdf

 

Thanks,

Rich Stafford

Chief Scientist

eQuorum Corporation