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From "Chris Ward (JIRA)" <j...@apache.org>
Subject [jira] Created: (OPENJPA-324) The MetaDataRepository class is not thread safe. Initialization under heavy load on a multi CPU/Core systems throws exceptions.
Date Mon, 20 Aug 2007 18:19:31 GMT
The MetaDataRepository class is not thread safe.  Initialization under heavy load on a multi
CPU/Core systems throws exceptions.
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                 Key: OPENJPA-324
                 URL: https://issues.apache.org/jira/browse/OPENJPA-324
             Project: OpenJPA
          Issue Type: Bug
          Components: kernel
    Affects Versions: 0.9.7, 0.9.6
         Environment: I have reproduced the problem in Windows and in Solaris.  It only affects
multi core/CPU systems.  I haven't reproduced the problem on single core systems.

I am using Spring 2.0.2 and OpenJPA 0.9.6 with an Oracle 10g database.

            Reporter: Chris Ward


OpenJPA's MetaDataRepository fails to load metadata for classess when multiple threads use
the same EntityManagerFactory class to resolve the metadata.  The MetaDataRepository implementation
is not thread safe.The problem only occurrs on multi core or multi processor machines that
can concurrently try to initialize meta data for classes.

To reproduce the problem I have inserted a sleep statement within the code to help reproduce
the problem consistently.  I have commented out the sleep statement in my deployed version
of the class.

This bug is sort of related to issue 250.  I have cleaned up all of the synchronization in
the class.  There should be less contention, however it could still be better if a ReentrantReadWriteLock
was used.  I noticed that someone had posted a new MetaDataRepository with a ReentrantReadWriteLock,
but too seems to have the same issues.



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