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https://issues.apache.org/jira/browse/PDFBOX-3280?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15259999#comment-15259999
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Andreas Lehmkühler commented on PDFBOX-3280:
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I expect an increased memory footprint as well
> PDDocument.importPage does not deep clone source page
> -----------------------------------------------------
>
> Key: PDFBOX-3280
> URL: https://issues.apache.org/jira/browse/PDFBOX-3280
> Project: PDFBox
> Issue Type: Bug
> Components: PDModel
> Affects Versions: 2.0.0
> Reporter: Cornelis Hoeflake
> Attachments: 1.pdf
>
>
> The method PDDocument.importPage does not deep clone the source page. This
> causes two issues, when closing the source document BEFORE saving the target
> document throws an already closed exception.
> Placing the close after saving the target document works fine. But... When
> splitting a document into a lot of small documents and than save that
> documents multithreaded will cause random exceptions like
> ArrayIndexOutOfBounds, COSStream closed etc.
> Check for example the following code. I attach the used source document.
> {code:title=Test.java|borderStyle=solid}
> PDDocument doc = new PDDocument();
> PDDocument load = PDDocument.load(new File(SOURCE_DOC));
> for (int p = 0; p<1000; p++) {
> doc.importPage(load.getPage(0));
> }
> ByteArrayOutputStream baos = new ByteArrayOutputStream();
> doc.save(baos);
> doc.close();
> load.close();
> final PDDocument doc2 = PDDocument.load(baos.toByteArray());
> // ok, now we have a big document loaded as it normally will be loaded.
> ExecutorService es = Executors.newFixedThreadPool(4);
> List<PDDocument> docs = Lists.newArrayList();
> for (int p = 0; p<doc2.getNumberOfPages(); p++) {
> final PDDocument newDoc = new PDDocument();
> newDoc.importPage(doc2.getPage(p));
> docs.add(newDoc);
> }
> for (int p = 0; p<doc2.getNumberOfPages(); p++) {
> final int page = p;
> es.submit(new Runnable() {
> @Override
> public void run() {
> try {
> PDDocument newDoc = docs.get(page);
> newDoc.save(new ByteArrayOutputStream());
> newDoc.close();
> } catch (IOException e) {
> e.printStackTrace();
> }
> }
> });
> }
> es.shutdown();
> }
> {code}
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