[PDFBOX-3272] Loaded fonts file descriptors open after closing document

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.8.11, 2.0.0
• Fix Version/s: 2.0.1, 3.0.0 PDFBox
• Component/s: FontBox
• Environment: Apache Tomcat, Linux
• Assignee: Andreas Lehmkühler
• Reporter: Gregor Ambrozic
• Created: 14/Mar/16 09:06
• Updated: 25/Mar/17 18:13
• Resolved: 22/Mar/16 18:25

Description

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:

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();
			}
		}
	}
}