[PDFBOX-3376] Memory leak in PDDcoument.close method

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Not A Problem
• Affects Version/s: 2.0.1
• Component/s: PDModel
• Assignee: Unassigned
• Reporter: Yan
• Created: 09/Jun/16 22:26
• Updated: 07/Mar/18 06:44
• Resolved: 13/Jun/16 06:01

Description

PDFBox PDDocument still uses memory after destruction. This causes, surprisingly, memory leaks in Java. Sample code:

import java.io.File;
import java.io.IOException;
import java.util.List;
import java.util.Vector;

import org.apache.pdfbox.pdmodel.PDDocument;

//javac -cp pdfbox.jar:commons-logging.jar Mrg.java
//java -cp pdfbox.jar:commons-logging.jar:. Mrg *pdf

public class Mrg
{
	public static void main(String[] args) throws Exception
	{
		Runtime instance = Runtime.getRuntime();
		System.err.println("Start: "+instance.totalMemory());

		List <PDDocument> infiles = new Vector<PDDocument>();
		String outname = "Output.pdf";
		for(int i=0; i<args.length; i++)
			infiles.add(PDDocument.load(new File (args[i])));
		PDDocument result = new PDDocument();
		for (PDDocument input : infiles)
		{
			int inpages = input.getNumberOfPages();					
			for (int i=0; i<inpages; ++i)
				result.addPage(input.getPage(i));
		}
		try	{
			result.save(outname);
		} catch (IOException e) {
			System.err.println(e.getMessage());
			System.exit(1);
		}
		result.close();
		Thread.currentThread().sleep(1000);
		System.err.println("All open: "+instance.totalMemory());
		for (PDDocument i : infiles)
			i.close();
		Thread.currentThread().sleep(1000);
		System.err.println("All closed: "+instance.totalMemory());
		(new java.util.Scanner(System.in)).nextLine();
		System.err.println("Finish: "+instance.totalMemory());
	}
}

Mine output:
>Start: 125829120
>All open: 277872640
>All closed: 277872640
>rthrth
>Finish: 277872640

The same happens with my main program (I was blaming SwingWorker): https://github.com/Yanpas/PdfMerger

Issue Links

• is related to: PDFBOX-4144 Pdf to image conversion not releasing memory after conversion