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https://issues.apache.org/jira/browse/LUCENE-2273?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12836361#action_12836361
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Uwe Schindler commented on LUCENE-2273:
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I added one more null check on the weak key of the cache in rev 912331
> FieldCacheImpl's getCacheEntries() is buggy as it uses WeakHashMap
> incorrectly and leads to ConcurrentModExceptions
> -------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-2273
> URL: https://issues.apache.org/jira/browse/LUCENE-2273
> Project: Lucene - Java
> Issue Type: Bug
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
> Fix For: 3.1
>
> Attachments: LUCENE-2273.patch
>
>
> The way how WeakHashMap works internally leads to the fact that it is not
> allowed to iterate over a WHM.keySet() and then get() the value. As each
> get() operation inspects the ReferenceQueue of the weak keys, they may
> suddenly disappear. If you use the entrySet() iterator you get key and value
> and no need to call get(), contains(),... that inspects the ReferenceQueue.
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