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java.lang.NullPointerException: 	at org.hibernate.tuple.AbstractTuplizer.createProxy(AbstractTuplizer.java:249)	at org.hibernate.persister.entity.BasicEntityPersister.createProxy(BasicEntityPersister.java:2831)	at org.hibernate.event.def.DefaultLoadEventListener.createProxyIfNecessary(DefaultLoadEventListener.java:218)	at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:163)	at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:79)	at org.hibernate.impl.SessionImpl.load(SessionImpl.java:603)	at org.hibernate.impl.SessionImpl.load(SessionImpl.java:596)	at Main.main(Main.java:17)