asdpboy created PDFBOX-5950:
-------------------------------
Summary: pdfbox PDFMergerUtility Potential OOM issues
Key: PDFBOX-5950
URL: https://issues.apache.org/jira/browse/PDFBOX-5950
Project: PDFBox
Issue Type: Bug
Affects Versions: 3.0.0 PDFBox, 2.0.32
Environment: jdk11
Reporter: asdpboy
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}}{color}
{color:#172b4d}one of the oom case{color}
{color:#FF0000}!https://cdn.nlark.com/yuque/0/2025/png/29126839/1738913671707-db4983a0-f7c8-4a6c-94b8-17d38f04a155.png?x-oss-process=image%2Fformat%2Cwebp%2Fresize%2Cw_1500%2Climit_0!{color}
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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