[ 
https://issues.apache.org/jira/browse/PDFBOX-3684?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Andrii Radistao updated PDFBOX-3684:
------------------------------------
    Description: 
I supply 2 PDF files (_certificate-of-analysis.pdf_ and 
_questionario-sulle.pdf_) which cause an exception if i try to merge them using 
{{PDFMergerUtility}}.

I've implemented code examples which run to the exceptions:
https://bitbucket.org/radistao/pdfbox-merge-bug/
or just take the same sources from the attached 
[radistao-pdfbox-merge-bug.zip|https://issues.apache.org/jira/secure/attachment/12852256/radistao-pdfbox-merge-bug.zip]

Those 2 files are included into the repository ({{test/resources/}}).

Error stack trace for _certificate-of-analysis.pdf_:
  * using {{addSource()}}:
   {quote}java.lang.StackOverflowError
        at java.util.HashMap.hash(HashMap.java:338)
        at java.util.HashMap.containsKey(HashMap.java:595)
        at java.util.HashSet.contains(HashSet.java:203)
        at 
org.apache.pdfbox.pdfwriter.COSWriter.addObjectToWrite(COSWriter.java:472)
        at 
org.apache.pdfbox.pdfwriter.COSWriter.visitFromArray(COSWriter.java:927)
        at org.apache.pdfbox.cos.COSArray.accept(COSArray.java:515)
        at 
org.apache.pdfbox.pdfwriter.COSWriter.visitFromDictionary(COSWriter.java:1061)
        at 
org.apache.pdfbox.pdfwriter.COSWriter.visitFromDictionary(COSWriter.java:1020)
        at 
org.apache.pdfbox.pdfwriter.COSWriter.visitFromDictionary(COSWriter.java:1020)
{quote}

  * using {{appendDocument()}}
{quote}org.apache.pdfbox.cos.COSDocument finalize
WARNING: Warning: You did not close a PDF Document
org.apache.pdfbox.cos.COSDocument finalize
WARNING: Warning: You did not close a PDF Document
org.apache.pdfbox.cos.COSDocument finalize
WARNING: Warning: You did not close a PDF Document
org.apache.pdfbox.cos.COSDocument finalize
WARNING: Warning: You did not close a PDF Document
org.apache.pdfbox.cos.COSDocument finalize
WARNING: Warning: You did not close a PDF Document

java.lang.StackOverflowError
        at 
org.apache.pdfbox.pdfwriter.COSWriter.getObjectKey(COSWriter.java:892)
        at 
org.apache.pdfbox.pdfwriter.COSWriter.writeReference(COSWriter.java:1175)
        at 
org.apache.pdfbox.pdfwriter.COSWriter.visitFromArray(COSWriter.java:928)
        at org.apache.pdfbox.cos.COSArray.accept(COSArray.java:515)
        at 
org.apache.pdfbox.pdfwriter.COSWriter.visitFromDictionary(COSWriter.java:1061)
        at 
org.apache.pdfbox.pdfwriter.COSWriter.visitFromDictionary(COSWriter.java:1020)
        at 
org.apache.pdfbox.pdfwriter.COSWriter.visitFromDictionary(COSWriter.java:1020)
        at 
org.apache.pdfbox.pdfwriter.COSWriter.visitFromDictionary(COSWriter.java:1020)
        at 
org.apache.pdfbox.pdfwriter.COSWriter.visitFromDictionary(COSWriter.java:1020)
{quote}


Note: in version 1.8.13 (see 
https://bitbucket.org/radistao/pdfbox-merge-bug/branch/test/v1.8.13) file 
_questionario-sulle.pdf_ merged fine (see attached merge result 
_v1.8.13-PdfMergerAddSourceTest-questionario-sulle.pdf_), but with just 
warnings:
{quote}org.apache.pdfbox.pdfparser.PDFParser parseObject
WARNING: expected='%%EOF' actual=''
org.apache.pdfbox.pdfparser.XrefTrailerResolver setStartxref
WARNING: Did not found XRef object at specified startxref position 0{quote}

  was:
I supply 2 PDF files (_certificate-of-analysis.pdf_ and 
_questionario-sulle.pdf_) which cause an exception if i try to merge them using 
{{PDFMergerUtility}}.

I've implemented code examples which run to the exceptions:
https://bitbucket.org/radistao/pdfbox-merge-bug/
or just take the same sources from the attached 
[radistao-pdfbox-merge-bug.zip|https://issues.apache.org/jira/secure/attachment/12852256/radistao-pdfbox-merge-bug.zip]

Those 2 files are included into the repository ({{test/resources/}}).

Error stack trace for _certificate-of-analysis.pdf_:
  * using {{addSource()}}:
   {quote}java.lang.StackOverflowError
        at java.util.HashMap.hash(HashMap.java:338)
        at java.util.HashMap.containsKey(HashMap.java:595)
        at java.util.HashSet.contains(HashSet.java:203)
        at 
org.apache.pdfbox.pdfwriter.COSWriter.addObjectToWrite(COSWriter.java:472)
        at 
org.apache.pdfbox.pdfwriter.COSWriter.visitFromArray(COSWriter.java:927)
        at org.apache.pdfbox.cos.COSArray.accept(COSArray.java:515)
        at 
org.apache.pdfbox.pdfwriter.COSWriter.visitFromDictionary(COSWriter.java:1061)
        at 
org.apache.pdfbox.pdfwriter.COSWriter.visitFromDictionary(COSWriter.java:1020)
        at 
org.apache.pdfbox.pdfwriter.COSWriter.visitFromDictionary(COSWriter.java:1020)
{quote}

  * using {{appendDocument()}}
{quote}org.apache.pdfbox.cos.COSDocument finalize
WARNING: Warning: You did not close a PDF Document
org.apache.pdfbox.cos.COSDocument finalize
WARNING: Warning: You did not close a PDF Document
org.apache.pdfbox.cos.COSDocument finalize
WARNING: Warning: You did not close a PDF Document
org.apache.pdfbox.cos.COSDocument finalize
WARNING: Warning: You did not close a PDF Document
org.apache.pdfbox.cos.COSDocument finalize
WARNING: Warning: You did not close a PDF Document

java.lang.StackOverflowError
        at 
org.apache.pdfbox.pdfwriter.COSWriter.getObjectKey(COSWriter.java:892)
        at 
org.apache.pdfbox.pdfwriter.COSWriter.writeReference(COSWriter.java:1175)
        at 
org.apache.pdfbox.pdfwriter.COSWriter.visitFromArray(COSWriter.java:928)
        at org.apache.pdfbox.cos.COSArray.accept(COSArray.java:515)
        at 
org.apache.pdfbox.pdfwriter.COSWriter.visitFromDictionary(COSWriter.java:1061)
        at 
org.apache.pdfbox.pdfwriter.COSWriter.visitFromDictionary(COSWriter.java:1020)
        at 
org.apache.pdfbox.pdfwriter.COSWriter.visitFromDictionary(COSWriter.java:1020)
        at 
org.apache.pdfbox.pdfwriter.COSWriter.visitFromDictionary(COSWriter.java:1020)
        at 
org.apache.pdfbox.pdfwriter.COSWriter.visitFromDictionary(COSWriter.java:1020)
{quote}



> PDF box crashes on mal-formed files
> -----------------------------------
>
>                 Key: PDFBOX-3684
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-3684
>             Project: PDFBox
>          Issue Type: Bug
>          Components: Utilities
>    Affects Versions: 2.0.4
>            Reporter: Andrii Radistao
>         Attachments: certificate-of-analysis.pdf, questionario-sulle.pdf, 
> radistao-pdfbox-merge-bug.zip, 
> v1.8.13-PdfMergerAddSourceTest-questionario-sulle.pdf
>
>
> I supply 2 PDF files (_certificate-of-analysis.pdf_ and 
> _questionario-sulle.pdf_) which cause an exception if i try to merge them 
> using {{PDFMergerUtility}}.
> I've implemented code examples which run to the exceptions:
> https://bitbucket.org/radistao/pdfbox-merge-bug/
> or just take the same sources from the attached 
> [radistao-pdfbox-merge-bug.zip|https://issues.apache.org/jira/secure/attachment/12852256/radistao-pdfbox-merge-bug.zip]
> Those 2 files are included into the repository ({{test/resources/}}).
> Error stack trace for _certificate-of-analysis.pdf_:
>   * using {{addSource()}}:
>    {quote}java.lang.StackOverflowError
>       at java.util.HashMap.hash(HashMap.java:338)
>       at java.util.HashMap.containsKey(HashMap.java:595)
>       at java.util.HashSet.contains(HashSet.java:203)
>       at 
> org.apache.pdfbox.pdfwriter.COSWriter.addObjectToWrite(COSWriter.java:472)
>       at 
> org.apache.pdfbox.pdfwriter.COSWriter.visitFromArray(COSWriter.java:927)
>       at org.apache.pdfbox.cos.COSArray.accept(COSArray.java:515)
>       at 
> org.apache.pdfbox.pdfwriter.COSWriter.visitFromDictionary(COSWriter.java:1061)
>       at 
> org.apache.pdfbox.pdfwriter.COSWriter.visitFromDictionary(COSWriter.java:1020)
>       at 
> org.apache.pdfbox.pdfwriter.COSWriter.visitFromDictionary(COSWriter.java:1020)
> {quote}
>   * using {{appendDocument()}}
> {quote}org.apache.pdfbox.cos.COSDocument finalize
> WARNING: Warning: You did not close a PDF Document
> org.apache.pdfbox.cos.COSDocument finalize
> WARNING: Warning: You did not close a PDF Document
> org.apache.pdfbox.cos.COSDocument finalize
> WARNING: Warning: You did not close a PDF Document
> org.apache.pdfbox.cos.COSDocument finalize
> WARNING: Warning: You did not close a PDF Document
> org.apache.pdfbox.cos.COSDocument finalize
> WARNING: Warning: You did not close a PDF Document
> java.lang.StackOverflowError
>       at 
> org.apache.pdfbox.pdfwriter.COSWriter.getObjectKey(COSWriter.java:892)
>       at 
> org.apache.pdfbox.pdfwriter.COSWriter.writeReference(COSWriter.java:1175)
>       at 
> org.apache.pdfbox.pdfwriter.COSWriter.visitFromArray(COSWriter.java:928)
>       at org.apache.pdfbox.cos.COSArray.accept(COSArray.java:515)
>       at 
> org.apache.pdfbox.pdfwriter.COSWriter.visitFromDictionary(COSWriter.java:1061)
>       at 
> org.apache.pdfbox.pdfwriter.COSWriter.visitFromDictionary(COSWriter.java:1020)
>       at 
> org.apache.pdfbox.pdfwriter.COSWriter.visitFromDictionary(COSWriter.java:1020)
>       at 
> org.apache.pdfbox.pdfwriter.COSWriter.visitFromDictionary(COSWriter.java:1020)
>       at 
> org.apache.pdfbox.pdfwriter.COSWriter.visitFromDictionary(COSWriter.java:1020)
> {quote}
> Note: in version 1.8.13 (see 
> https://bitbucket.org/radistao/pdfbox-merge-bug/branch/test/v1.8.13) file 
> _questionario-sulle.pdf_ merged fine (see attached merge result 
> _v1.8.13-PdfMergerAddSourceTest-questionario-sulle.pdf_), but with just 
> warnings:
> {quote}org.apache.pdfbox.pdfparser.PDFParser parseObject
> WARNING: expected='%%EOF' actual=''
> org.apache.pdfbox.pdfparser.XrefTrailerResolver setStartxref
> WARNING: Did not found XRef object at specified startxref position 0{quote}



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