Under concurrent access, createEntityManager() fails with NPE.
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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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