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java.lang.NullPointerException: 	at org.hibernate.type.IntegerType.next(IntegerType.java:82)	at org.hibernate.engine.Versioning.increment(Versioning.java:131)	at org.hibernate.event.def.DefaultFlushEntityEventListener.getNextVersion(DefaultFlushEntityEventListener.java:387)	at org.hibernate.event.def.DefaultFlushEntityEventListener.scheduleUpdate(DefaultFlushEntityEventListener.java:279)	at org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:151)	at org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:219)	at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:99)	at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:49)	at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1027)	at org.hibernate.ejb.AbstractEntityManagerImpl.flush(AbstractEntityManagerImpl.java:304)	at org.openxava.model.impl.JPAPersistenceProvider.flush(JPAPersistenceProvider.java:72)	at org.openxava.model.impl.MapFacadeBean.commitTransaction(MapFacadeBean.java:74)	at org.openxava.model.impl.MapFacadeBean.setValues(MapFacadeBean.java:192)	at org.openxava.model.MapFacade.setValues(MapFacade.java:598)	at org.openxava.actions.SaveAction.execute(SaveAction.java:39)	at org.openxava.controller.ModuleManager.executeAction(ModuleManager.java:356)	at org.openxava.controller.ModuleManager.executeAction(ModuleManager.java:273)	at org.openxava.controller.ModuleManager.execute(ModuleManager.java:237)