org.hibernate.MappingException: Unknown entity: java.util.ArrayList

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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)