Bernhard Geisberger created COMPRESS-492:
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             Summary: NullPointerException for 7zip files without file headers
                 Key: COMPRESS-492
                 URL: https://issues.apache.org/jira/browse/COMPRESS-492
             Project: Commons Compress
          Issue Type: Bug
          Components: Archivers
    Affects Versions: 1.18
            Reporter: Bernhard Geisberger
         Attachments: sample.7z

When loading a .7z file with correct headers and without files info headers 
using the SevenZFile class, a NullPointerException is thrown when calling 
getEntries or getNextEntry, because the archive.files member of SevenZFile is 
null. Ideally, a subclass of IOException should be thrown in this case.

I attached an example file we encountered in our file processing pipeline, 
which causes the exception.



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