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https://issues.apache.org/jira/browse/PDFBOX-2173?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14200983#comment-14200983
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ASF subversion and git services commented on PDFBOX-2173:
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Commit 1637228 from [~tilman] in branch 'pdfbox/branches/1.8'
[ https://svn.apache.org/r1637228 ]
PDFBOX-2173: Nullpointer when validating empty file, by John Hewson
> Nullpointer when validating empty file
> --------------------------------------
>
> Key: PDFBOX-2173
> URL: https://issues.apache.org/jira/browse/PDFBOX-2173
> Project: PDFBox
> Issue Type: Bug
> Components: Preflight
> Affects Versions: 1.8.6
> Reporter: Per-Olof Widström
> Priority: Minor
> Fix For: 2.0.0
>
>
> I am validating a PDF and I am getting a NullpointerException when the
> filesize is 0 bytes. I looked at the code and saw a small misstake, and
> therefore I am reporting this. I use version 1.8.6
> {code:java|title=PreflightParser.java}
> protected void checkPdfHeader()
> {
> //[snip]
> String secondLine = reader.readLine();
> byte[] secondLineAsBytes = secondLine.getBytes(encoding.name());
> if (secondLine != null && secondLineAsBytes.length >= 5)
> //[snip]
> }
> {code}
> As you can see {{secondLineAsBytes}} is checked for null value, but only
> after being called once.
> {code}
> java.lang.NullPointerException
> at
> org.apache.pdfbox.preflight.parser.PreflightParser.checkPdfHeader(PreflightParser.java:297)
> at
> org.apache.pdfbox.preflight.parser.PreflightParser.parse(PreflightParser.java:195)
> at
> org.apache.pdfbox.preflight.parser.PreflightParser.parse(PreflightParser.java:180)
> at
> org.apache.pdfbox.preflight.parser.PreflightParser.parse(PreflightParser.java:168)
> {code}
> h4. Workaround
> Before validating, check the filesize, if it is larger than 0.
> h4. How to reproduce
> Try to validate with an empty file.
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