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https://issues.apache.org/jira/browse/PDFBOX-5462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17556200#comment-17556200
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Andreas Lehmkühler commented on PDFBOX-5462:
--------------------------------------------
The behaviour changed in 3.x. 2.x implements different strategies to cache
things which makes the code complicated, hard to maintain and sort of
nontransparent. Consequently some of the internal caching (scratch files aren't
used for reading anymore) was removed so that the user has to care about it.
if you are dealing with streams you might want to spool them to a file first
especially if the corresponding pdf is a bigger one. 2.x does the same under
the hood but 3.x no more.
I'm going to add some more details about that change to the 3.x migration guide
> OutOfMemoryError when watermaking in 3.0.0-RC1
> ----------------------------------------------
>
> Key: PDFBOX-5462
> URL: https://issues.apache.org/jira/browse/PDFBOX-5462
> Project: PDFBox
> Issue Type: Bug
> Affects Versions: 3.0.0 PDFBox
> Reporter: Marian Ion
> Priority: Major
> Attachments: TestPdfBox.tgz, my-pdf-test.jar
>
>
> I am using the Maven *3.0.0-RC1* version and I encounter the following error
> when watermarking a 5120 pages file:
> {quote} java.lang.OutOfMemoryError: Java heap space: failed reallocation of
> scalar replaced objects
> {quote}
>
> However, the *2.0.26* version code works without problem!
> The code is basically this :
> {code:java}
> private static final PDFont PDF_FONT = PDType1Font.HELVETICA;
> memoryUsageSetting = MemoryUsageSetting.setupMixed(2 * ONE_GIGA, 40 *
> ONE_GIGA);
> //try (PDDocument pdfDocument = PDDocument.load(is, memoryUsageSetting)) {
> // 2.0.26
> try (PDDocument pdfDocument = Loader.loadPDF(inputStream,
> memoryUsageSetting)) { // 3.0.0-RC1
> int nbPages = addWatermark(watermarkText, pdfDocument);
> pdfDocument.save(os);
> }
> ...
> private int addWatermark(String watermarkText, PDDocument document) throws
> IOException {
> int numberOfPages = document.getNumberOfPages();
> System.out.printf("Start adding watermark on a %d pages PDF
> document%n", numberOfPages);
> long start = System.nanoTime();
> int pageIndex = 0;
> for(PDPage page : document.getPages()) {
> ++pageIndex;
> try (PDPageContentStream cs = new PDPageContentStream(document,
> page, PDPageContentStream.AppendMode.APPEND, true, true)) {
> float width = page.getMediaBox().getWidth();
> float height = page.getMediaBox().getHeight();
> int rotation = page.getRotation();
> switch(rotation) {
> case 90:
> width = page.getMediaBox().getHeight();
> height = page.getMediaBox().getWidth();
>
> cs.transform(Matrix.getRotateInstance(Math.toRadians(90), height, 0));
> break;
> case 180:
>
> cs.transform(Matrix.getRotateInstance(Math.toRadians(180), width, height));
> break;
> case 270:
> width = page.getMediaBox().getHeight();
> height = page.getMediaBox().getWidth();
>
> cs.transform(Matrix.getRotateInstance(Math.toRadians(270), 0, width));
> break;
> default:
> break;
> }
> double stringWidth =
> (double)PDF_FONT.getStringWidth(watermarkText) / 1000 * FONT_HEIGHT;
> double diagonalLength = Math.sqrt((double)width * width +
> (double)height * height);
> double angle = Math.atan2(height, width);
> cs.transform(Matrix.getRotateInstance(angle, 0, 0));
> cs.setFont(PDF_FONT, (float)FONT_HEIGHT);
> //cs.setRenderingMode(RenderingMode.STROKE); // for "hollow"
> effect
> PDExtendedGraphicsState gs = new PDExtendedGraphicsState();
> gs.setNonStrokingAlphaConstant(0.2f);
> gs.setStrokingAlphaConstant(0.2f);
> gs.setBlendMode(BlendMode.MULTIPLY);
> cs.setGraphicsStateParameters(gs);
> // some API weirdness here. When int, range is 0..255.
> // when float, this would be 0..1f
> cs.setNonStrokingColor(0f, 0, 0);
> cs.setStrokingColor(0f, 0, 0); // black
> float x = (float)((diagonalLength - stringWidth) / 2); //
> "horizontal" position in rotated world
> float y = (float)(-FONT_HEIGHT / 4); // 4 is a trial-and-error
> thing, this lowers the text a bit
> cs.beginText();
> cs.newLineAtOffset(x, y);
> cs.showText(watermarkText);
> cs.endText();
> } finally {
> ...
> }
> return numberOfPages;
> }
> {code}
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