当我尝试使用hibernate和envers保存实体时，虽然实体在数据库中存在，但审计日志不是，我得到以下异常：
Caused by: org.hibernate.envers.exception.AuditException: Unable to create revision because of non-active transaction
at org.hibernate.envers.event.spi.BaseEnversEventListener.checkIfTransactionInProgress(BaseEnversEventListener.java:132)
at org.hibernate.envers.event.spi.EnversPostUpdateEventListenerImpl.onPostUpdate(EnversPostUpdateEventListenerImpl.java:34)
at org.hibernate.action.internal.EntityUpdateAction.postUpdate(EntityUpdateAction.java:264)
at org.hibernate.action.internal.EntityUpdateAction.execute(EntityUpdateAction.java:211)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:582)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:456)
at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:337)
at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:39)
at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1282)
at org.springframework.orm.hibernate5.SessionFactoryUtils.flush(SessionFactoryUtils.java:144)
... 96 more
什么似乎是问题？