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https://issues.apache.org/jira/browse/IO-606?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17513051#comment-17513051
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Richard Adams commented on IO-606:
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This might be unexpected behaviour, but I don't think this is a bug. According
to documentation of {{{}normalize{}}}:
{color:#629755}If the double dot has no parent path segment to work with,
{{color}{color:#629755}@code {color}{color:#629755}null}
{color}{color:#629755} is returned.{color}
> FilenameUtils.concat fails with relative path
> ---------------------------------------------
>
> Key: IO-606
> URL: https://issues.apache.org/jira/browse/IO-606
> Project: Commons IO
> Issue Type: Bug
> Components: Utilities
> Affects Versions: 2.6
> Reporter: Matthias Ronge
> Priority: Major
>
> {{FilenameUtils.concat("../../../../src/test/resources/", "filename.xml")}}
> returns {{null}}, where expected result should be like
> {{../../../../src/test/resources/filename.xml}}
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