When calling PdfReader(String filename) I get

java.io.IOException: trailer not found.
        at com.lowagie.text.pdf.PdfReader.rebuildXref

so I suspected (from other posts here) that the PDF to be
read had some error.  I was able to read the source PDF
with Acrobat 8.1.3, so perhaps Acrobat has some "forgiveness"
built in, allowing it to render a PDF in some cases even
though it has errors.

Anyway, I used Acrobat to "optimize" the PDF, using default
parameters.  This optimized PDF could be read by PdfReader
with no problem.

I can not supply the PDF because it contains confidential
information supplied to us, but I'm wondering if anyone has
any suggestions in how to pinpoint just what the error is so
this can be communicated to those providing the PDF.

Acrobat indicates (in "Properties...") the following:
     PDF Producer: Acrobat 9.0.0
     PDF Version: 1.6 (Acrobat 7.x)

I am hoping someone may have suggestions as to how to
locate/pinpoint the specific error which caused the
problem with the original PDF.  I am not a PDF specialist
at all, having only used iText to provide a couple of
custom solutions needed where I work.

Thank you


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