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https://issues.apache.org/jira/browse/HTTPCLIENT-1453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13890617#comment-13890617
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Jasper Rosenberg commented on HTTPCLIENT-1453:
----------------------------------------------
Hi Oleg. Unfortunately (or fortunately depending on your perspective :) it has
only happened once in production since we updated to 4.3.2 a couple weeks ago,
so I think I will just catch and ignore the exception for now, and then upgrade
to 4.3.3 when it comes out. Thanks!
> PoolingHttpClientConnectionManager thread safety
> ------------------------------------------------
>
> Key: HTTPCLIENT-1453
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1453
> Project: HttpComponents HttpClient
> Issue Type: Bug
> Components: HttpConn
> Affects Versions: 4.3.2
> Environment: Windows 8.1 x64
> java version "1.7.0_45"
> Java(TM) SE Runtime Environment (build 1.7.0_45-b18)
> Java HotSpot(TM) 64-Bit Server VM (build 24.45-b08, mixed mode)
> Reporter: Rahim Alizada
> Fix For: 4.3.3
>
>
> Although the PoolingHttpClientConnectionManager is marked as ThreadSafe,
> connectionManager.closeExpiredConnections() call from multiple threads causes
> ConcurrentModificationException.
> java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextEntry(HashMap.java:839)
> at java.util.HashMap$EntryIterator.next(HashMap.java:880)
> at java.util.HashMap$EntryIterator.next(HashMap.java:878)
> at
> org.apache.http.pool.AbstractConnPool.purgePoolMap(AbstractConnPool.java:469)
> at
> org.apache.http.pool.AbstractConnPool.closeExpired(AbstractConnPool.java:517)
> at
> org.apache.http.impl.conn.PoolingHttpClientConnectionManager.closeExpiredConnections(PoolingHttpClientConnectionManager.java:363)
> at com.jyvee.shared.http.HttpHelper.getHttpClient(HttpHelper.java:121)
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