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https://issues.apache.org/jira/browse/LUCENE-818?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12477399
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Doug Cutting commented on LUCENE-818:
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> Perhaps for close() of an already closed object just do nothing?
+1 Double-closing is sometimes hard to avoid. I'd rather have it ignored than
force folks to, e.g., write more complicated exception handlers.
> IndexWriter should detect when it's used after being closed
> -----------------------------------------------------------
>
> Key: LUCENE-818
> URL: https://issues.apache.org/jira/browse/LUCENE-818
> Project: Lucene - Java
> Issue Type: Bug
> Components: Index
> Affects Versions: 2.1
> Reporter: Michael McCandless
> Assigned To: Michael McCandless
> Priority: Minor
> Attachments: LUCENE-818.patch
>
>
> Spinoff from this thread on java-user:
> http://www.gossamer-threads.com/lists/lucene/java-user/45986
> If you call addDocument on IndexWriter after it's closed you'll hit a
> hard-to-explain NullPointerException (because the RAMDirectory was
> closed). Before 2.1, apparently you won't hit any exception and the
> IndexWrite will keep running but will have released it's write lock (I
> think).
> I plan to fix IndexWriter methods to throw an IllegalStateException if
> it has been closed.
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