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https://issues.apache.org/jira/browse/PDFBOX-5950?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17925961#comment-17925961
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asdpboy commented on PDFBOX-5950:
---------------------------------
[https://svn.apache.org/r1923727]
No Permission:(
> pdfbox PDFMergerUtility Potential OOM issue
> --------------------------------------------
>
> Key: PDFBOX-5950
> URL: https://issues.apache.org/jira/browse/PDFBOX-5950
> Project: PDFBox
> Issue Type: Bug
> Components: Utilities
> Affects Versions: 2.0.32, 3.0.0 PDFBox
> Environment: jdk11
> Reporter: asdpboy
> Priority: Major
> Attachments: PDFMergerUtility.java, after.png, before.png, oom.png
>
>
> I have identified a potential bug in Apache PDFBox and would like to report
> it. Below are the details:
>
> When there are a large number of sources (e.g., thousands), the `tobeclosed`
> method will load the PDF document into memory. This may pose a risk of
> Out-of-Memory (OOM) during the merge process.
>
> The following adjustments can be made, close the sourceDoc object immediately
> .
>
> org.apache.pdfbox.multipdf.PDFMergerUtility#legacyMergeDocuments
> {code:java}
> for (Object sourceObject : sources)
> {
> PDDocument sourceDoc = null;
> if (sourceObject instanceof File)
> {
> sourceDoc = PDDocument.load((File) sourceObject,
> partitionedMemSetting);
> }
> else
> {
> sourceDoc = PDDocument.load((InputStream) sourceObject,
> partitionedMemSetting);
> }
> try
> {
> appendDocument(destination, sourceDoc);
> }
> finally
> {
> IOUtils.closeAndLogException(sourceDoc, LOG, "PDDocument", null);
> }
> }
> {code}
> one of the oom cases
> !oom.png!
> Comparison of Memory Usage Before and After Modification (Merging a 16.8MB
> File 200 Times, with JVM Heap Size Limit Set to 2GB)
> Before Modification: An OutOfMemoryError (OOM) occurred after just over 1
> minute of operation. Due to insufficient heap memory, Full GC (Full Garbage
> Collection) was triggered frequently, which can be observed from the CPU
> usage curve on the left.
> !before.png!
> After Modification: The heap memory is now able to be collected normally
> without causing an OOM.
> !after.png!
>
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