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[PersistenceUnit: JPA] Unable to configure EntityManagerFactory
javax.persistence.PersistenceException: [PersistenceUnit: fb-persistence] Unable to configure EntityManagerFactory at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:378) at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:56) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:48) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:32) at it.synclab.fb.test.Test.main(Test.java:13)Caused by: java.lang.ClassCastException: org.hibernate.mapping.UnionSubclass cannot be cast to org.hibernate.mapping.RootClass at org.hibernate.cfg.annotations.PropertyBinder.bind(PropertyBinder.java:209) at org.hibernate.cfg.annotations.PropertyBinder.makePropertyValueAndBind(PropertyBinder.java:200) at org.hibernate.cfg.AnnotationBinder.processElementAnnotations(AnnotationBinder.java:2061) at org.hibernate.cfg.AnnotationBinder.processIdPropertiesIfNotAlready(AnnotationBinder.java:796) at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:707) at org.hibernate.cfg.Configuration$MetadataSourceQueue.processAnnotatedClassesQueue(Configuration.java:4008) at org.hibernate.cfg.Configuration$MetadataSourceQueue.processMetadata(Configuration.java:3962) at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1371) at org.hibernate.cfg.Configuration.buildMappings(Configuration.java:1348) at org.hibernate.ejb.Ejb3Configuration.buildMappings(Ejb3Configuration.java:1522) at org.hibernate.ejb.EventListenerConfigurator.configure(EventListenerConfigurator.java:193) at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:1100) at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:282) at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:366) ... 4 more