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From "Rick Curtis (JIRA)" <j...@apache.org>
Subject [jira] Created: (OPENJPA-1379) Locking problem when using timestamp QueryCache eviction policy.
Date Mon, 09 Nov 2009 20:48:32 GMT
Locking problem when using timestamp QueryCache eviction policy.
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                 Key: OPENJPA-1379
                 URL: https://issues.apache.org/jira/browse/OPENJPA-1379
             Project: OpenJPA
          Issue Type: Bug
          Components: datacache
    Affects Versions: 2.0.0-M3, 2.0.0-M4
            Reporter: Rick Curtis
            Assignee: Rick Curtis


I ran into a bug in AbstractQueryCache when using the timestamp QueryCache eviction policy.
This is only a problem when running in a multithreaded environment.

The net of the problem is that in AbstractQueryCache.onTypesChanged(TypesChangedEvent ev)
we call writeLock(), but when using the non-default eviction policy we never call writeUnlock().
As a result, any other threads requesting a writeLock on the cache will block indefinitely.

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