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https://issues.apache.org/jira/browse/PDFBOX-3272?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15198494#comment-15198494
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John Hewson commented on PDFBOX-3272:
-------------------------------------
The stream can't be closed after the parsing, because TTF parsing is actually
lazy, the TrueTypeFont holds on to the stream and can subsequently read further
data from it. For that reason there's a TrueTypeFont#close() method which
allows any streams held by the font to be closed once we're done with it. I
suspect that we're missing a call to that method somewhere.
> Loaded fonts file descriptors open after closing document
> ---------------------------------------------------------
>
> Key: PDFBOX-3272
> URL: https://issues.apache.org/jira/browse/PDFBOX-3272
> Project: PDFBox
> Issue Type: Bug
> Components: FontBox
> Affects Versions: 1.8.11, 2.0.0
> Environment: Apache Tomcat, Linux
> Reporter: Gregor Ambrozic
> Assignee: Andreas Lehmkühler
> Fix For: 1.8.12, 2.0.1, 2.1.0
>
> Attachments: OpenSans-Regular.ttf
>
>
> I am experiencing problems with TTF fonts loaded for generating PDFs which
> eventually result in too many open files on Linux. The PDFBox version I
> tested last was 2.0.0-RC3.
> Basically for each PDF I create a document and load two fonts which I want to
> use. After the document is generated I close all the resources, but the file
> descriptors for both fonts remain open.
> The file descriptors should be automatically closed or an API should exist to
> close font resources.
> My basic code:
> {code}
> import java.io.File;
> import java.io.IOException;
> import java.lang.management.ManagementFactory;
> import org.apache.commons.io.output.ByteArrayOutputStream;
> import org.apache.pdfbox.pdmodel.PDDocument;
> import org.apache.pdfbox.pdmodel.PDPage;
> import org.apache.pdfbox.pdmodel.PDPageContentStream;
> import org.apache.pdfbox.pdmodel.common.PDRectangle;
> import org.apache.pdfbox.pdmodel.font.PDFont;
> import org.apache.pdfbox.pdmodel.font.PDType0Font;
> public class FontTest
> {
> // Run the program which will create 1 PDF document and close all
> resources per second for 100 seconds.
> // The font open file descriptor count will increase all the time,
> until the program finishes.
> // Command to check open files: lsof -p PID | grep ttf
> public static void main(String[] args)
> {
> // should print out PID before @<hostname>
> System.out.println("process id: " +
> ManagementFactory.getRuntimeMXBean().getName());
> for (int i = 0; i < 100; i++)
> {
> createPDF();
> try
> {
> Thread.sleep(1000);
> }
> catch (InterruptedException e)
> {
> e.printStackTrace();
> }
> }
> }
> private static void createPDF()
> {
> PDDocument doc = null;
> PDPage page = null;
> ByteArrayOutputStream bos = null;
> try
> {
> doc = new PDDocument();
> page = new PDPage(PDRectangle.A4);
> doc.addPage(page);
> // using standard font
> PDFont font = PDType0Font.load(doc, new
> File("./pdf/OpenSans-Regular.ttf"));
> PDPageContentStream content = new
> PDPageContentStream(doc, page);
> content.beginText();
> content.setFont(font, 72);
> content.showText("OMG");
> content.endText();
> content.close();
> bos = new ByteArrayOutputStream();
> doc.save(bos);
> byte[] bytes = bos.toByteArray();
> System.out.println("create new pdf with size: " +
> bytes.length);
> }
> catch (Exception e)
> {
> e.printStackTrace();
> }
> finally
> {
> try
> {
> doc.close();
> bos.close();
> }
> catch (IOException e)
> {
> e.printStackTrace();
> }
> }
> }
> }
> {code}
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