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https://issues.apache.org/jira/browse/OPENJPA-2538?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14190196#comment-14190196
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Rick Curtis commented on OPENJPA-2538:
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Hmm, okay. Just as long as you're sure that _metas gets cleaned up... I think
this problem does exist in other app server environments.
> Classloader memory leak in PCRegistry
> -------------------------------------
>
> Key: OPENJPA-2538
> URL: https://issues.apache.org/jira/browse/OPENJPA-2538
> Project: OpenJPA
> Issue Type: Bug
> Components: Enhance, osgi
> Affects Versions: 2.3.0
> Reporter: Grzegorz Grzybek
> Assignee: Rick Curtis
> Priority: Critical
>
> I'm using OpenJPA in OSGi environment (namely: JBoss Fuse 6.1). We had nasty
> {{NullPointerException}} in Felix when trying to load source code during
> initialization of class metadata. [This
> line|https://github.com/apache/openjpa/blob/2.3.0/openjpa-kernel/src/main/java/org/apache/openjpa/meta/MetaDataRepository.java#L1614]
> returned duplicate entity classes - half of them were from old revision of a
> bundle and half - from new revision.
> I tracked down the problem to the point, where
> {{org.apache.openjpa.enhance.PCRegistry#register()}} was invoked as part of
> constructing new instances of entity classes (static initialization injected
> during class enhancement). Although {{_metas}} is instance of
> {{ConcurrentReferenceHashMap}} with weak keys, the keys (entity classes) had
> other hard references too. Here's a list of the hard refs I got from simple
> heap dump:
> * org.apache.openjpa.meta.MetaDataRepository#_impls
> * org.apache.openjpa.meta.InheritanceComparator#_base
> * org.apache.openjpa.enhance.PCRegistry.Meta#pcSuper
> * org.apache.openjpa.meta.MetaDataRepository#_oids
> so on every bundle refresh we have next bunch of classes in {{_metas}}...
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