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https://issues.apache.org/jira/browse/SOLR-7803?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14633229#comment-14633229
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ASF subversion and git services commented on SOLR-7803:
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Commit 1691900 from [~thetaphi] in branch 'dev/trunk'
[ https://svn.apache.org/r1691900 ]
SOLR-7803: Use Java 8 ThreadLocal
> Classloading deadlock in TrieField
> ----------------------------------
>
> Key: SOLR-7803
> URL: https://issues.apache.org/jira/browse/SOLR-7803
> Project: Solr
> Issue Type: Bug
> Affects Versions: 5.2.1
> Environment: OSX, JDK8u45
> Reporter: Markus Heiden
> Assignee: Uwe Schindler
> Labels: patch
> Fix For: 5.3, Trunk
>
> Attachments: SOLR-7803.patch, SOLR-7803.patch, TrieField.patch
>
>
> When starting a test Sol instance, it locks up sometimes. We took a thread
> dump and all threads are trying to load classes via Class.forName() and are
> stuck in that method. One of these threads got one step further into the
> <clinit> of TrieField where it creates an internal static instance of
> TrieDateField (circular dependency). I don't know why this locks up exactly,
> but this code smells anyway. So I removed that instance and made the used
> methods static in TrieDateField.
> This does not completely remove the circular dependency, but at least it is
> no more in <clinit>. For the future someone may extract a util class to
> remove the circular dependency.
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