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org.apache.openjpa.persistence.PersistenceException: null at org.apache.openjpa.kernel.AbstractBrokerFactory.newBroker(AbstractBrokerFactory.java:193) 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)Caused by: 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) ... 10 more