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org.hibernate.MappingException: Unknown entity: java.util.ArrayList at org.hibernate.metamodel.internal.MetamodelImpl.entityPersister( at org.hibernate.internal.SessionImpl.getEntityPersister( at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId( at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId( at org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId( at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient( at org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate( at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate( at org.hibernate.internal.SessionImpl.fireSave( at at at basic.Runner.main(