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https://issues.apache.org/jira/browse/PDFBOX-5950?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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asdpboy updated PDFBOX-5950:
----------------------------
Attachment: after.png
before.png
oom.png
> pdfbox PDFMergerUtility Potential OOM issues
> ---------------------------------------------
>
> Key: PDFBOX-5950
> URL: https://issues.apache.org/jira/browse/PDFBOX-5950
> Project: PDFBox
> Issue Type: Bug
> Affects Versions: 2.0.32, 3.0.0 PDFBox
> Environment: jdk11
> Reporter: asdpboy
> Priority: Major
> Attachments: 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:
>
> - *{*}PDFBox Version{*}*: 2.0.32 、3.0.0
> - *{*}Java Version{*}*: 11
>
> 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
> for (Object sourceObject : sources){
> PDDocument sourceDoc = null;
> if (sourceObject instanceof File) \{ sourceDoc = PDDocument.load((File)
> sourceObject, partitionedMemSetting); }
> else
> { sourceDoc = PDDocument.load((InputStream) sourceObject,
> partitionedMemSetting); }
> {color:#ff0000}try {{color}
> {color:#ff0000}appendDocument(destination, sourceDoc);{color}
> {color:#FF0000}}finally \{{color}
> {color:#ff0000}IOUtils.closeAndLogException(sourceDoc, LOG, "PDDocument",
> null);{color}
> {color:#FF0000}}
>
> one of the oom case
>
> 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.
> !https://cdn.nlark.com/yuque/0/2025/png/29126839/1738922546412-1478a69c-f8b5-4412-80b7-7f573f5ffa7f.png?x-oss-process=image%2Fformat%2Cwebp%2Fresize%2Cw_1500%2Climit_0!
>
> - *{*}After Modification{*}*: The heap memory is now able to be collected
> normally without causing an OOM.
> !https://cdn.nlark.com/yuque/0/2025/png/29126839/1738922398317-d36dce8f-8aea-4dcf-b809-78e2333b514f.png?x-oss-process=image%2Fformat%2Cwebp%2Fresize%2Cw_1500%2Climit_0!
>
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