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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-2273) FieldCacheImpl's getCacheEntries() is buggy as it uses WeakHashMap incorrectly and leads to ConcurrentModExceptions
Date Sun, 21 Feb 2010 10:54:27 GMT
FieldCacheImpl's getCacheEntries() is buggy as it uses WeakHashMap incorrectly and leads to
ConcurrentModExceptions
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                 Key: LUCENE-2273
                 URL: https://issues.apache.org/jira/browse/LUCENE-2273
             Project: Lucene - Java
          Issue Type: Bug
            Reporter: Uwe Schindler


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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