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https://issues.apache.org/jira/browse/LUCENE-3089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13149572#comment-13149572
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Robert Muir commented on LUCENE-3089:
-------------------------------------
I think java 7 close-with-resources is stupid too.
> CachingTokenFilter can cause close() to be called twice.
> --------------------------------------------------------
>
> Key: LUCENE-3089
> URL: https://issues.apache.org/jira/browse/LUCENE-3089
> Project: Lucene - Java
> Issue Type: Bug
> Reporter: Robert Muir
>
> In LUCENE-3064, we added some state and checks to MockTokenizer to validate
> that consumers
> are properly using the tokenstream workflow (described here:
> http://lucene.apache.org/java/3_0_3/api/core/org/apache/lucene/analysis/TokenStream.html)
> One problem I noticed in
> TestTermVectorsWriter.testEndOffsetPositionWithCachingTokenFilter is that
> providing a CachingTOkenFilter directly will result
> in close() being called twice on the underlying tokenstream... this seems
> wrong.
> Some ideas to fix this could be:
> # CachingTokenFilter overrides close() and we document that you must close
> the underlying stream yourself. I think this is what the queryparser does
> anyway.
> # CachingTokenFilter does something tricky to ensure it only closes the
> underlying stream once.
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