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https://issues.apache.org/jira/browse/PDFBOX-5771?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17818662#comment-17818662
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weiteFeng commented on PDFBOX-5771:
-----------------------------------
[~tilman] As you say, "Windows memory is at 623MB and slowly growing". I think
a memory leak has occurred at this point. In the production environment, I
deploy PDFBOX-related code in an RPC service, so my Java process will keep
running and will not stop, and as accesses increase, the memory occupied by the
process will keep increasing until it is killed.
> Adding watermarks to PDFs may suffer native memory leaks
> --------------------------------------------------------
>
> Key: PDFBOX-5771
> URL: https://issues.apache.org/jira/browse/PDFBOX-5771
> Project: PDFBox
> Issue Type: Bug
> Environment: java8, java11
> pdfbox2, pdfbox3
> DebianGNU/Linux8
> Reporter: weiteFeng
> Priority: Critical
> Attachments: App_2024_02_19_103625.jfr, Designing Data Intensive
> Applications.pdf, image-2024-02-19-10-41-19-720.png, pdf_for_test.pdf
>
>
> When using the following code to add a watermark to a PDF file, the memory
> usage of the Java process will gradually increase, even exceeding the limit
> of the maximum heap memory usage. When the process uses memory exceeding the
> maximum memory of the machine, the Java process will be killed by the
> operating system.
> When analyzing the dumped memory, I found that when the Java process occupies
> a large amount of memory (viewed through the top command), the heap memory of
> the process actually does not occupy too much space, so I inferred that there
> may be a native memory leak in this code, due to I don't have a deep
> understanding of Linux memory analysis, so I can't find the problem in this
> code.
> I wonder if you have any suggestion.
> The following is the code I use to add watermarks to PDF:
>
> {code:java}
> public ByteBuffer AddWaterMark(AddWaterMarkRequest request) throws Exception {
> byte[] b = TBaseHelper.copyBinary(request.PDFContent).array();
> PDDocument pdf = PDDocument.load(b);
> ByteArrayOutputStream output = new ByteArrayOutputStream();
> if (Objects.equals(request.WaterMark.Font, "") ||
> !this.isFontExist(request.WaterMark.Font))
> { request.WaterMark.Font = pdf_rpcConstants.WenQuanDengKuanZhengHei; }
> PDFont font = getFontFromByte(pdf, request.WaterMark.Font);
> addWaterMark(pdf, request.WaterMark, font);
> pdf.save(output);
> pdf.close();
> return ByteBuffer.wrap(output.toByteArray());
> }
>
> private void addWaterMark(PDDocument pdf, WaterMark waterMark, PDFont font)
> throws Exception {
> List<String> texts = waterMark.getWaterMarkTexts();
> for (PDPage page : pdf.getPages()) {
> PDPageContentStream cs = new PDPageContentStream(pdf, page,
> PDPageContentStream.AppendMode.APPEND, true, true);
> PDExtendedGraphicsState r0 = new PDExtendedGraphicsState();
> r0.setNonStrokingAlphaConstant((float) waterMark.AlphaConstant);
> r0.setAlphaSourceFlag(true);
> cs.setGraphicsStateParameters(r0);
> cs.setNonStrokingColor(new Color(waterMark.Color.Red,
> waterMark.Color.Green, waterMark.Color.Blue));
> float horizontalSpacing = waterMark.HorizontalSpacing;
> float verticalSpacing = waterMark.VerticalSpacing;
> int horizontalNumber = (int) (page.getMediaBox().getWidth() /
> horizontalSpacing) + 2;
> int verticalNumber = (int) (page.getMediaBox().getHeight() /
> verticalSpacing) + 2;
> cs.beginText();
> cs.setFont(font, waterMark.getFontSize());
> for (int i = 0; i <= horizontalNumber; i++) {
> for (int j = 0; j < verticalNumber; j++) {
> for (int k = 0; k < texts.size(); k++) {
> float tx = waterMark.StartIndexX + (i - 1) *
> horizontalSpacing + k * waterMark.getLineSpace();
> float ty = waterMark.StartIndexY + j * verticalSpacing;
> if (i % 2 == 0)
> {
> cs.setTextMatrix(Matrix.getRotateInstance(waterMark.RotateTheta, tx, ty));
> }
> else
> {
> cs.setTextMatrix(Matrix.getRotateInstance(waterMark.RotateTheta, tx, ty +
> waterMark.Offset)); }
> cs.showText(texts.get(k));
> }
> }
> }
> cs.endText();
> cs.restoreGraphicsState();
> cs.close();
> }
> }
> {code}
>
>
>
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