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java.lang.NullPointerException: 	at org.datanucleus.state.AbstractStateManager.providedObjectField(AbstractStateManager.java:1447)	at com.acti.interaction.jdo.InteractionJDO.jdoProvideField(InteractionJDO.java)	at com.acti.interaction.jdo.InteractionJDO.jdoProvideFields(InteractionJDO.java)	at org.datanucleus.state.AbstractStateManager.provideFields(AbstractStateManager.java:1515)	at org.datanucleus.ObjectManagerImpl.getL2CacheableObject(ObjectManagerImpl.java:4846)	at org.datanucleus.ObjectManagerImpl.putObjectsIntoLevel2Cache(ObjectManagerImpl.java:4864)	at org.datanucleus.ObjectManagerImpl.performLevel2CacheUpdateAtCommit(ObjectManagerImpl.java:4286)	at org.datanucleus.ObjectManagerImpl.processNontransactionalAtomicChanges(ObjectManagerImpl.java:1236)	at org.datanucleus.ObjectManagerImpl.persistObject(ObjectManagerImpl.java:1630)	at org.datanucleus.api.jdo.JDOPersistenceManager.jdoMakePersistent(JDOPersistenceManager.java:731)	at org.datanucleus.api.jdo.JDOPersistenceManager.makePersistent(JDOPersistenceManager.java:756)	at com.acti.interaction.service.InteractionService.persistInteractionService(InteractionService.java:200)	at com.acti.interaction.controller.InteractionAction.persistInteraction(InteractionAction.java:60)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)