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https://issues.apache.org/jira/browse/LUCENE-3235?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13054066#comment-13054066
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Robert Muir commented on LUCENE-3235:
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+1 to drop java 5
> TestDoubleBarrelLRUCache hangs under Java 1.5, 3.x and trunk, likely JVM bug
> ----------------------------------------------------------------------------
>
> Key: LUCENE-3235
> URL: https://issues.apache.org/jira/browse/LUCENE-3235
> Project: Lucene - Java
> Issue Type: Bug
> Reporter: Michael McCandless
>
> Not sure what's going on yet... but under Java 1.6 it seems not to hang bug
> under Java 1.5 hangs fairly easily, on Linux. Java is 1.5.0_22.
> I suspect this is relevant:
> http://stackoverflow.com/questions/3292577/is-it-possible-for-concurrenthashmap-to-deadlock
> which refers to this JVM bug
> http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6865591 which then refers
> to this one http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6822370
> It looks like that last bug was fixed in Java 1.6 but not 1.5.
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