OutOfMemory with page with many large images

Hi,

With a long html page filled with photos, we get OutOfMemory. Raising the memory limit is not an option, it already very high, 8-12 GB. This is a server and we’re using the Java API.

We need a way to let PD4ML render pages an images in a streaming fashion, more memory efficient. It cannot keep the entire rendered PDF, with all hi-res images, in memory.

How can achieve this?

private static PD4ML createPD4ML(int htmlWidth, Insets insetsMM, boolean landscape) throws FileNotFoundException {
PD4ML pd4ml = new PD4ML();
pd4ml.setPageInsetsMM(insetsMM);
pd4ml.setHtmlWidth(htmlWidth);
pd4ml.setPageSize(landscape ? pd4ml.changePageOrientation(PD4Constants.A4) : PD4Constants.A4);
pd4ml.enableSmartTableBreaks(true);
if (log.isDebugEnabled()) {
pd4ml.enableDebugInfo();
}
pd4ml.useTTF("java:net/pingpong/tm/fonts", true);
return pd4ml;
}

private static void createPDF(Person person, User user, Course course, HtmlResource htmlResource, File tmpPdf)
throws FileNotFoundException, IOException {
OutputStream outputStream = new FileOutputStream(tmpPdf);
String html = resolvePathsAndFixHtml(person, user, htmlResource, course, true);
try {
DocumentManagerHandler.writePDFWithHeader(html, outputStream);

…
and in DocumentManagerHandler

public static void writePDFWithHeader(String html, OutputStream outputStream) throws InvalidParameterException,
IOException {
PD4ML pd4ml = createPD4ML(DEFAULT_HTML_WIDTH, DEFAULT_INSETS_MM, false);
pd4ml.setHtmlWidth(640);

PD4PageMark header = new PD4PageMark();
header.setTitleAlignment(PD4PageMark.RIGHT_ALIGN);
header.setFont(new Font("sansserif", Font.PLAIN, 11));
header.setAreaHeight(25);
header.setTitleTemplate("${title}");
pd4ml.setPageHeader(header);

pd4ml.render(new StringReader(html), outputStream);
}