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java.lang.IllegalArgumentException: attempt to create delete event with null entity	at org.hibernate.event.spi.DeleteEvent.(	at org.hibernate.internal.SessionImpl.delete(	at org.hibernate.ejb.AbstractEntityManagerImpl.remove(	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(	at com.sun.proxy.$Proxy30.remove(Unknown Source)	at	at	at	at	at	at	at	at Source)