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POConverting Docx to image using Docx4j and PdfBox causes OutOfMemoryError
 

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  1. POConverting Docx to image using Docx4j and PdfBox causes OutOfMemoryError
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    <p>I'm converting the first page of a docx file to an image in twoo steps using dox4j and pdfbox but I'm currently getting an <code>OutOfMemoryError</code> every time.</p> <p>I've been able to determine that the exception is thrown on the very last step of this process, while the <code>convertToImage</code> method is being called, however I've been using the second step of this method to convert pdfs for some time now without issue so I am at a loss as to what might be the cause unless perhaps dox4j is encoding the pdf is a way which I have not yet tested or is corrupt.</p> <p>I've tried replacing the <code>ByteArrayOutputStream</code> with a <code>FileOutputStream</code> and the pdf seems to render correctly is not any larger than I would expect.</p> <p>This is the code I am using:</p> <pre><code>WordprocessingMLPackage wordMLPackage = WordprocessingMLPackage.load(file); org.docx4j.convert.out.pdf.PdfConversion c = new org.docx4j.convert.out.pdf.viaXSLFO.Conversion(wordMLPackage); ((org.docx4j.convert.out.pdf.viaXSLFO.Conversion)c).setSaveFO(File.createTempFile("fonts", ".fo")); ByteArrayOutputStream os = new ByteArrayOutputStream(); c.output(os, new PdfSettings()); byte[] bytes = os.toByteArray(); os.close(); ByteArrayInputStream is = new ByteArrayInputStream(bytes); PDDocument document = PDDocument.load(is); PDPage page = (PDPage) document.getDocumentCatalog().getAllPages().get(0); BufferedImage image = page.convertToImage(BufferedImage.TYPE_INT_RGB, 96); is.close(); document.close(); </code></pre> <p><strong>Edit</strong> To give more context on this situation, this code is being run in a grails web-application. I have tried several different variants of this code, including nulling out everything once no longer needed, using FileInputStream and FileOutputStream to try to conserve more physical memory and inspect the output of docx4j and pdfbox, each of which seem to work correctly.</p> <p>I'm using docx4j 2.8.1 and pdfbox 0.7.3, I have also tried pdf-renderer but I still get an OutOfMemoryError. My suspicions are that docx4j is using too much memory but does not produce the error until the pdf to image conversion.</p> <p>I would gladly except an alternate way of converting a docx file to a pdf or directly to an image as an answer, however I am currently trying to replace jodconverter which has been problematic to run on a server.</p>
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    1. COSounds like the docx4j part is OK, and that you need to profile convertToImage. How large is the byte array? How many pages in the PDF? How much RAM are you giving java? Once you have your PDPage, would it help to null out other objects?
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    2. CO@JasonPlutext: I have to conclude that it is not just the `convertToImage` because, I can take the rendered pdf file from docx4j after it fails and retry with just the PDF and it works fine.
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    3. COThe Doc file I'm using as my primary test is 52KB and the PDF it generates is 38.5KB. I've set my java memory to 3GB and it's still failing.
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