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From "Pinaki Poddar (JIRA)" <j...@apache.org>
Subject [jira] Created: (OPENJPA-449) Under concurrent access, createEntityManager() fails with NPE.
Date Tue, 20 Nov 2007 22:53:43 GMT
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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