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