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java.lang.NullPointerException: 	at org.apache.openjpa.lib.conf.Configurations.configureInstance(Configurations.java:425)	at org.apache.openjpa.lib.conf.Configurations.configureInstance(Configurations.java:375)	at org.apache.openjpa.lib.conf.PluginValue.instantiate(PluginValue.java:102)	at org.apache.openjpa.lib.conf.ObjectValue.instantiate(ObjectValue.java:79)	at org.apache.openjpa.conf.OpenJPAConfigurationImpl.newBrokerInstance(OpenJPAConfigurationImpl.java:557)	at org.apache.openjpa.jdbc.conf.JDBCConfigurationImpl.newBrokerInstance(JDBCConfigurationImpl.java:693)	at org.apache.openjpa.kernel.AbstractBrokerFactory.newBrokerImpl(AbstractBrokerFactory.java:416)	at org.apache.openjpa.jdbc.kernel.JDBCBrokerFactory.newBrokerImpl(JDBCBrokerFactory.java:121)	at org.apache.openjpa.kernel.AbstractBrokerFactory.newBroker(AbstractBrokerFactory.java:174)	at org.apache.openjpa.kernel.DelegatingBrokerFactory.newBroker(DelegatingBrokerFactory.java:142)	at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:190)	at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:143)	at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:55)	at org.apache.roller.weblogger.business.jpa.JPAPersistenceStrategy.getThreadLocalEntityManager(JPAPersistenceStrategy.java:252)	at org.apache.roller.weblogger.business.jpa.JPAPersistenceStrategy.getEntityManager(JPAPersistenceStrategy.java:239)	at org.apache.roller.weblogger.business.jpa.JPAPersistenceStrategy.release(JPAPersistenceStrategy.java:148)	at org.apache.roller.weblogger.business.jpa.JPAWebloggerImpl.release(JPAWebloggerImpl.java:106)	at org.apache.roller.weblogger.business.runnable.WorkerThread.run(WorkerThread.java:78)	at org.apache.roller.weblogger.business.runnable.ContinuousWorkerThread.run(ContinuousWorkerThread.java:76)