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https://issues.apache.org/jira/browse/PDFBOX-3376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15326416#comment-15326416
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Andreas Lehmkühler commented on PDFBOX-3376:
--------------------------------------------
Your screenshot looks quite perfect and most notable it looks as expected. The
used memory is freed at the end. It doesn't show any memory leak.
The management of the committed memory is part of the JDK and its gc. Once an
amount of memory is allocated by the JDK it most likely isn't released to the
OS although the running application doesn't need it anymore.
As a starter see the following
[post|http://stackoverflow.com/questions/29826465/how-to-reduce-committed-heap-memory-in-jvm]
> Memory leak in PDDcoument.close method
> --------------------------------------
>
> Key: PDFBOX-3376
> URL: https://issues.apache.org/jira/browse/PDFBOX-3376
> Project: PDFBox
> Issue Type: Bug
> Components: PDModel
> Affects Versions: 2.0.1
> Reporter: Yan
> Attachments: Снимок экрана_2016-06-11_16-12-36.png, Снимок
> экрана_2016-06-11_18-01-25.png
>
>
> PDFBox PDDocument still uses memory after destruction. This causes,
> surprisingly, memory leaks in Java. Sample code:
> {code}
> import java.io.File;
> import java.io.IOException;
> import java.util.List;
> import java.util.Vector;
> import org.apache.pdfbox.pdmodel.PDDocument;
> //javac -cp pdfbox.jar:commons-logging.jar Mrg.java
> //java -cp pdfbox.jar:commons-logging.jar:. Mrg *pdf
> public class Mrg
> {
> public static void main(String[] args) throws Exception
> {
> Runtime instance = Runtime.getRuntime();
> System.err.println("Start: "+instance.totalMemory());
> List <PDDocument> infiles = new Vector<PDDocument>();
> String outname = "Output.pdf";
> for(int i=0; i<args.length; i++)
> infiles.add(PDDocument.load(new File (args[i])));
> PDDocument result = new PDDocument();
> for (PDDocument input : infiles)
> {
> int inpages = input.getNumberOfPages();
>
> for (int i=0; i<inpages; ++i)
> result.addPage(input.getPage(i));
> }
> try {
> result.save(outname);
> } catch (IOException e) {
> System.err.println(e.getMessage());
> System.exit(1);
> }
> result.close();
> Thread.currentThread().sleep(1000);
> System.err.println("All open: "+instance.totalMemory());
> for (PDDocument i : infiles)
> i.close();
> Thread.currentThread().sleep(1000);
> System.err.println("All closed: "+instance.totalMemory());
> (new java.util.Scanner(System.in)).nextLine();
> System.err.println("Finish: "+instance.totalMemory());
> }
> }
> {code}
> Mine output:
> >Start: 125829120
> >All open: 277872640
> >All closed: 277872640
> >rthrth
> >Finish: 277872640
> The same happens with my main program (I was blaming SwingWorker):
> https://github.com/Yanpas/PdfMerger
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