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https://issues.apache.org/jira/browse/PDFBOX-5497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17585094#comment-17585094
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Tilman Hausherr commented on PDFBOX-5497:
-----------------------------------------
{{-Xmx128m}}, seriously? Merging a lot of small PDFs means you're gonna have a
large one.
{quote}
Is there any option to directly stream the content to an OutputStream without
consuming the final PDF in memory?
{quote}
No, there isn't. PDF isn't something like HTML.
> OutOfMemoryError - PDFMergerUtility
> -----------------------------------
>
> Key: PDFBOX-5497
> URL: https://issues.apache.org/jira/browse/PDFBOX-5497
> Project: PDFBox
> Issue Type: Bug
> Components: Utilities
> Affects Versions: 2.0.26
> Reporter: Viktor Merkel
> Priority: Major
>
> Merging a lot of small PDFs by using the PDFMergerUtility results in a
> java.lang.OutOfMemoryError.
> Code to reproduce:
> {code:java}
> package test.pdfbox.merge;
> import java.io.File;
> import java.io.IOException;
> import org.apache.pdfbox.io.MemoryUsageSetting;
> import org.apache.pdfbox.multipdf.PDFMergerUtility;
> import org.apache.pdfbox.multipdf.PDFMergerUtility.DocumentMergeMode;
> public class PDFMergeTest {
> public static void main(String[] args) throws IOException {
> if (args.length == 0) {
> System.out.println("No source folder set");
> return;
> }
> File folder = new File(args[0]);
> PDFMergerUtility merger = new PDFMergerUtility();
> merger.setDestinationFileName(folder.toString() + "\\merged.pdf");
>
> merger.setDocumentMergeMode(DocumentMergeMode.OPTIMIZE_RESOURCES_MODE); //
> has no effect
> //adding the source files (except merged.pdf)
> for (File file : folder.listFiles()) {
> if (!file.getName().equals("merged.pdf")) {
> merger.addSource(file);
> }
> }
> mrger.mergeDocuments(MemoryUsageSetting.setupTempFileOnly());
> System.out.println("DONE");
> }
> }
> {code}
> Create a new source folder, put a simple PDF document (like the one from
> [https://www.adobe.com/support/products/enterprise/knowledgecenter/media/c4611_sample_explain.pdf]
> for example), make 1000 copies of it and run the code above with the new
> created folder as argument and the following Java VM args:
> {noformat}
> -Xms128M -Xmx128M{noformat}
> This results in a OutOfMemory error. Switching the document merge mode to
> OPTIMIZE_RESOURCES_MODE does not fix the problem.
> Does PDFBox not close the PDF sources properly?
>
> Increasing the memory is not an option because this problem relates to the
> sizes of the source documents. Is there any option to directly stream the
> content to an OutputStream without consuming the final PDF in memory?
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