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https://issues.apache.org/jira/browse/PDFBOX-5731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17796711#comment-17796711
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Axel Howind commented on PDFBOX-5731:
-------------------------------------
[~lycheng] I have created a patch for PDFBox 3. I use a cleanup thread instead,
to prevent the memory leak I mentioned earlier. Also the locking should not be
on the queue but on nameMap to prevent a race condition that could lead to
another memory leak. I am referring to this piece from your proposed code:
{code:java}
public static void removeNameMapKey() {
Reference<? extends COSName> ref;
while ((ref = queue.poll()) != null) {
synchronized (queue) {
Entry entry = (Entry) ref;
nameMap.remove(entry.getName());
}
}
} {code}
The output I get from the test code looks good:
{noformat}
0, size=570
1000000, size=850072
2000000, size=1643475
3000000, size=2583958
4000000, size=3398540
5000000, size=4223199
6000000, size=5030981
7000000, size=5838754
8000000, size=6836608
9000000, size=7576135
after loop: 8569358
System.gc(): 569
after clearResources(): 569{noformat}
Added patch for *PDFBox 3*
"PDFBox5731_clear_out_unused_COSName_instances_automatically_PDFBOX3.patch".
> org.apache.pdfbox.cos.COSName#nameMap There is a memory leak problem.
> ---------------------------------------------------------------------
>
> Key: PDFBOX-5731
> URL: https://issues.apache.org/jira/browse/PDFBOX-5731
> Project: PDFBox
> Issue Type: Bug
> Affects Versions: 2.0.30, 3.0.1 PDFBox
> Reporter: liu
> Priority: Major
> Attachments: COSName.java,
> PDFBox5731_clear_out_unused_COSName_instances_automatically_PDFBOX3.patch,
> attempted_fix_for_PDFBOX-5731__clear_out_unused_COSName_instances_automatically.patch,
>
> attempted_fix_for_PDFBOX-5731__clear_out_unused_COSName_instances_automatically_2.patch,
>
> attempted_fix_for_PDFBOX-5731__clear_out_unused_COSName_instances_automatically_using_cleaner.patch,
> image-2023-12-08-16-02-12-293.png, image-2023-12-13-17-04-22-073.png,
> image-2023-12-14-18-10-14-278.png, screenshot-1.png, screenshot-2.png,
> screenshot-3.png, screenshot-4.png, screenshot-5.png, screenshot-6.png,
> screenshot-8.png
>
>
> !image-2023-12-08-16-02-12-293.png!
> !screenshot-1.png!
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