pdf.save() in endless loop

[baszero]

General question regarding pdf.save() method: is there any known issue where this method is looping forever and eating up all the JVM memory until OutOfMemoryException?

rst.pdfbox.layout.elements.Document pdf = ...initialition....;
OutputStream os = ...prepare outputstream for pdf...;
pdf.save(os); // takes forever

My code works fine in 98% of all cases, but under certain conditions, the save command hangs...
Any ideas?

[baszero]

I made a thread dump and see this in the case where it hangs:

"http-bio-8443-exec-2" #24 daemon prio=5 os_prio=31 tid=0x00007fd80fcfd800 nid=0x3c07 runnable [0x00007000082e9000]
   java.lang.Thread.State: RUNNABLE
	at java.io.UnixFileSystem.checkAccess(Native Method)
	at java.io.File.canRead(File.java:768)
	at javax.imageio.ImageIO.read(ImageIO.java:1300)
	at rst.pdfbox.layout.elements.ImageElement.<init>(ImageElement.java:44)
	at com.myowncode.helper.PDFHelper$1.afterPage(PDFHelper.java:96)
	at rst.pdfbox.layout.elements.Document.afterPage(Document.java:386)
	at rst.pdfbox.layout.elements.render.RenderContext.closePage(RenderContext.java:414)
	at rst.pdfbox.layout.elements.render.RenderContext.newPage(RenderContext.java:371)
	at rst.pdfbox.layout.elements.render.VerticalLayout.turnPage(VerticalLayout.java:62)
	at rst.pdfbox.layout.elements.render.VerticalLayout.layoutAndDrawReleative(VerticalLayout.java:213)
	at rst.pdfbox.layout.elements.render.VerticalLayout.renderReleative(VerticalLayout.java:148)
	at rst.pdfbox.layout.elements.render.VerticalLayout.render(VerticalLayout.java:96)
	at rst.pdfbox.layout.elements.render.VerticalLayout.render(VerticalLayout.java:79)
	at rst.pdfbox.layout.elements.render.RenderContext.render(RenderContext.java:309)
	at rst.pdfbox.layout.elements.Document.render(Document.java:299)
	at rst.pdfbox.layout.elements.Document.save(Document.java:341)
	at com.myowncode.resource.pdf.PDFGenerateResource.getView(PDFGenerateResource.java:70)

[baszero]

Update: I found the root cause: if an ImageElement is in "portrait orientation" and it is higher than the actual page height, the library hangs forever...

I use this code to insert an image into the pdf, maybe this one is not correct for such extreme portrait images:

    private void addImage(Document pdf, Node imageNode) throws Exception {
        InputStream is = null;
        try {
            is = imageNode.getInputStream();
            ImageElement img = new ImageElement(is);
            img.setWidth(ImageElement.SCALE_TO_RESPECT_WIDTH);
            img.setHeight(ImageElement.SCALE_TO_RESPECT_WIDTH);
            pdf.add(img);
            
        } finally {
            try {
                is.close();
            } catch (Exception e) {
            } finally {
            }
        }
    }

My assumption was of course that in case an image is higher than the available height of the page, that maxHeight is set and the width would be calculated accordingly automatically (not using the full width of the page...)

Is this a bug? Or what can I do in order to avoid this behaviour?

[oytuntez]

I've seen the same thing with Paragraph.setMaxWidth as well as Image.