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https://issues.apache.org/jira/browse/LUCENE-5047?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13944007#comment-13944007
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Uwe Schindler commented on LUCENE-5047:
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I will backport this one with LUCENE-5550 to 4.x (we are on Java 7 now).
> Trunk's NIOFSDir and MMapDir throw different Exception on file not found
> cases because of use of FileChannel.open()
> -------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-5047
> URL: https://issues.apache.org/jira/browse/LUCENE-5047
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/store
> Affects Versions: 5.0
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
> Fix For: 4.8, 5.0
>
> Attachments: LUCENE-5047.patch, LUCENE-5047.patch, LUCENE-5047.patch
>
>
> In trunk, we use FileChannel.open() when opening files from NIOFSDir and
> MMapDirectory. This new method (all new APIs in Java 7!) throw
> java.nio.file.NoSuchFileException if a file does not exist. The old-style
> FileNotFoundException is only thrown by old APIs.
> We have to decide how to correctly document the expected behaviour in the
> abstract Directory interface and how we fix this (Directory should clearly
> state *which* IOException type is to be thrown if we really depend on the
> specific type).
> The new exceptions are more specific, so you get the most "correct" exception
> (it may happen with old apis that you get FNFE if you open a file where you
> have no access because it is locked...). With Java 7's FileChannel.open() you
> get a separate and correct Exception.
> A possible fix for now may be to try/catch for the new Exceptions in the 2
> directory impls (there is also a try-with-resources there) and rethrow as
> FNFE.
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