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java.lang.NullPointerException: 	at org.hibernate.engine.internal.StatefulPersistenceContext.clear(StatefulPersistenceContext.java:237)	at org.hibernate.internal.SessionImpl.internalClear(SessionImpl.java:340)	at org.hibernate.internal.SessionImpl.clear(SessionImpl.java:336)	at org.hibernate.jpa.spi.AbstractEntityManagerImpl.clear(AbstractEntityManagerImpl.java:1419)	at sun.reflect.GeneratedMethodAccessor178.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:344)	at com.sun.proxy.$Proxy79.clear(Unknown Source)