PDFbox loading large files

Question

I'm trying to convert the first page of a pdf file to image using PDFBox. When i'm loading a large pdf file i get an exception.

code:

    PDDocument doc;
    try {
        InputStream input  = new URL("http://www.jewishfederations.org/local_includes/downloads/39497.pdf").openStream();
        doc = PDDocument.load(input);
        PDPage firstPage = (PDPage) doc.getDocumentCatalog().getAllPages().get(0);
        BufferedImage image =firstPage.convertToImage();
        File outputfile = new File("image2.png");
        ImageIO.write(image, "png", outputfile);
        input.close();
        doc.close();

    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

exception:

org.apache.pdfbox.pdfparser.BaseParser parseCOSStream
WARNING: Specified stream length 72435 is wrong. Fall back to reading stream until 'endstream'.
org.apache.pdfbox.exceptions.WrappedIOException: Could not push back 72435 bytes in order to reparse stream. Try increasing push back buffer using system property org.apache.pdfbox.baseParser.pushBackSize
    at org.apache.pdfbox.pdfparser.BaseParser.parseCOSStream(BaseParser.java:554)
    at org.apache.pdfbox.pdfparser.PDFParser.parseObject(PDFParser.java:605)
    at org.apache.pdfbox.pdfparser.PDFParser.parse(PDFParser.java:194)
    at org.apache.pdfbox.pdmodel.PDDocument.load(PDDocument.java:1219)
    at org.apache.pdfbox.pdmodel.PDDocument.load(PDDocument.java:1186)
    at Worker.main(Worker.java:27)
Caused by: java.io.IOException: Push back buffer is full
    at java.io.PushbackInputStream.unread(Unknown Source)
    at org.apache.pdfbox.io.PushBackInputStream.unread(PushBackInputStream.java:144)
    at org.apache.pdfbox.io.PushBackInputStream.unread(PushBackInputStream.java:133)
    at org.apache.pdfbox.pdfparser.BaseParser.parseCOSStream(BaseParser.java:550)
    ... 5 more

Answer 1

An alternative solution for the 1.8.* PDFBox versions is to use the non-sequential parser. In that case, the code would not be

doc = PDDocument.load(input);

but

doc = PDDocument.loadNonSeq(input, null);

that parser (which will be the only one in the upcoming 2.0 version) is independent of the size of a pushback buffer.