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From "Kevin Sutter (JIRA)" <>
Subject [jira] Created: (OPENJPA-437) EntityManagerFactory is not thread-safe
Date Thu, 08 Nov 2007 14:23:50 GMT
EntityManagerFactory is not thread-safe

                 Key: OPENJPA-437
             Project: OpenJPA
          Issue Type: Bug
          Components: kernel
    Affects Versions: 1.0.0, 1.0.1, 1.0.2, 1.1.0
            Reporter: Kevin Sutter
            Assignee: Kevin Sutter
             Fix For: 1.0.2, 1.1.0

Under certain conditions, we have discovered that the EntityManagerFactory is not thread safe
when creating EntityManagers.  The problem is in the loadPersistentTypes method of the AbstractBrokerFactory.
 There is an unprotected data structure (_pcClassNames) that can various problems (NullPointerException,
IndexOutOfBoundsException, etc) when attempting to add new elements to the ArrayList.  Other
similar datastructures in this part are properly synchronized (_pcClassLoaders for example),
but somehow we missed this one.

A common scenario where this might be encountered is if your SLSB has an injected PersistenceUnit
(EntityManagerFactory), but is attempting to create the EntityManager during a post-bean creation
method (@PostConstruct).  In this case, the SLSB instances are probably using the same EMF
instance (of course this would depend on your application server implementation).  If you
have this type of environment, then hitting these SLSB's with multiple clients could get you
into this situation.

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