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https://issues.apache.org/jira/browse/TIKA-4882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18112571#comment-18112571
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ASF GitHub Bot commented on TIKA-4882:
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timgrein opened a new pull request, #3142:
URL: https://github.com/apache/tika/pull/3142
Currently the behavior of `FilenameUtils.calculateExtension` only specifies
that the `defaultValue` is returned on a parse exception or a null value. The
behavior for an unknown value is not specified and silently returns `.bin`. I
adjusted the docs and now the `defaultValue` is returned, if the extension is
unknown.
> FilenameUtils.calculateExtension ignores defaultValue on unknown path
> ---------------------------------------------------------------------
>
> Key: TIKA-4882
> URL: https://issues.apache.org/jira/browse/TIKA-4882
> Project: Tika
> Issue Type: Bug
> Components: core
> Reporter: Tim Grein
> Priority: Minor
>
> FilenameUtils.calculateExtension ignores an unknown extension in the sense
> that the behavior on an unknown extension is not specified in the javadoc and
> it's not explicitly handled. It should probably be either handled or
> explicitly documented.
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