[PDFBOX-3359] Drawing to Graphics2D / ScratchFileBuffer not closed

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.1
• Fix Version/s: 3.0.0 PDFBox
• Component/s: Rendering
• Assignee: Andreas Lehmkühler
• Reporter: Ivan Ridao Freitas
• Created: 21/May/16 16:12
• Updated: 18/Aug/23 05:46
• Resolved: 03/Dec/20 16:21

Description

First, there is a little bug on PDFRenderer.renderPageToGraphics(int pageIndex, Graphics2D graphics, float scale) when using scale != 1 the call to clearRect() fills the original size with white background, but it should fill the scaled size.

Second, I implemented a JPanel which is painted using that function and on every paint this message goes to the console:
"DEBUG ScratchFileBuffer:516 - ScratchFileBuffer not closed!". Here is the code to test it, run it and resize the JFrame:

PanelTest.java

import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.io.File;
import java.io.IOException;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.WindowConstants;

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.rendering.PDFRenderer;

public class PanelTest {
   
    private static JPanel getTestPanel() {
        PDDocument doc = null;
        try {
            doc = PDDocument.load(new File("anyfile.pdf"));
        } catch (IOException e) {
            e.printStackTrace();
        }
        final PDFRenderer renderer = new PDFRenderer(doc);
        JPanel panel = new JPanel() {
            @Override
            protected void paintComponent(Graphics g) {
                try {
                    renderer.renderPageToGraphics(0, (Graphics2D) g, 0.5f);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        };
        return panel;
    }

    public static void main(String[] args) throws Exception {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                JFrame frame = new JFrame();
                frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
                frame.add(getTestPanel());
                frame.pack();
                frame.setSize(600, 400);
                Dimension paneSize = frame.getSize();
                Dimension screenSize = frame.getToolkit().getScreenSize();
                frame.setLocation((screenSize.width - paneSize.width) / 2, (screenSize.height - paneSize.height) / 2);
                frame.setTitle("Test");
                frame.setVisible(true);
            }
        });
    }
}

Ivan

Issue Links

• duplicates: PDFBOX-3388 PDFTextStripper - ScratchFileBuffer not closed!
• is duplicated by: PDFBOX-4634 org.apache.pdfbox.io.ScratchFileBuffer - ScratchFileBuffer not closed!
• is related to: PDFBOX-3381 PDF rendering regression
• is related to: PDFBOX-4396 Memory leak due to soft reference caching
• relates to: PDFBOX-2999 Optimize COSStream scratch file usage