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java.lang.NullPointerException: 	at org.hibernate.cfg.Ejb3JoinColumn.checkReferencedColumnsType(Ejb3JoinColumn.java:550)	at org.hibernate.cfg.BinderHelper.createSyntheticPropertyReference(BinderHelper.java:258)	at org.hibernate.cfg.ToOneFkSecondPass.doSecondPass(ToOneFkSecondPass.java:116)	at org.hibernate.cfg.Configuration.processEndOfQueue(Configuration.java:1596)	at org.hibernate.cfg.Configuration.processFkSecondPassInOrder(Configuration.java:1519)	at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1420)	at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1844)	at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:850)	at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:843)	at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.withTccl(ClassLoaderServiceImpl.java:398)	at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:842)	at org.hibernate.jpa.HibernatePersistenceProvider.createEntityManagerFactory(HibernatePersistenceProvider.java:75)	at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:54)	at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:55)	at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:39)	at com.example.Main.main(Main.java:5)