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https://issues.apache.org/jira/browse/OPENJPA-449?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Patrick Linskey resolved OPENJPA-449.
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Resolution: Duplicate
Duplicate of OPENJPA-437
> Under concurrent access, createEntityManager() fails with NPE.
> --------------------------------------------------------------
>
> Key: OPENJPA-449
> URL: https://issues.apache.org/jira/browse/OPENJPA-449
> Project: OpenJPA
> Issue Type: Bug
> Reporter: Pinaki Poddar
>
> Under concurrent access, new Broker construction fails with NPE.
> The observed scenario (when many threads are asking for new Brokers) shows
> the following:
> Caused by: <openjpa-0.0.0-rnull nonfatal general error>
> org.apache.openjpa.persistence.PersistenceException: null
> at
> org.apache.openjpa.kernel.AbstractBrokerFactory.newBroker(AbstractBrokerFactory.java:206)
> at
> org.apache.openjpa.kernel.DelegatingBrokerFactory.newBroker(DelegatingBrokerFactory.java:142)
> at
> org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:192)
> at
> org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:145)
> at
> org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:1)
> Caused by: java.lang.NullPointerException
> at
> org.apache.openjpa.kernel.AbstractBrokerFactory.loadPersistentTypes(AbstractBrokerFactory.java:263)
> at
> org.apache.openjpa.kernel.AbstractBrokerFactory.newBroker(AbstractBrokerFactory.java:198)
> The cause is an uninitialzed instance variable _pcClassLoaders in
> AbstractBrokerFactory. It is *conditionally* initialized within
> loadPersistentTypes() which is invoked during broker creation. Safer option
> is to intialize this variable on class constructor.
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