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org.hibernate.MappingException: Unknown entity: java.util.ArrayList at org.hibernate.metamodel.internal.MetamodelImpl.entityPersister(MetamodelImpl.java:620) at org.hibernate.internal.SessionImpl.getEntityPersister(SessionImpl.java:1596) at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:104) at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:192) at org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:38) at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:177) at org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:32) at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:73) at org.hibernate.internal.SessionImpl.fireSave(SessionImpl.java:668) at org.hibernate.internal.SessionImpl.save(SessionImpl.java:660) at org.hibernate.internal.SessionImpl.save(SessionImpl.java:655) at basic.Runner.main(Runner.java:27)