id auto generated jpa

1@Entityjavax.persistence.EntityJPA annotationSpecifies that the class is an entity.See JavaDoc Reference Page...
2public class EntityWithAutoId1 {
3    @Idjavax.persistence.IdJPA annotationSpecifies the primary key of an entity.See JavaDoc Reference Page... @GeneratedValuejavax.persistence.GeneratedValueJPA annotationProvides for the specification of generation strategies for the
4 values of primary keys.See JavaDoc Reference Page...(strategyGeneratedValue.strategyannotation element(Optional) The primary key generation strategy
5 that the persistence provider must use to
6 generate the annotated entity primary key.See JavaDoc Reference Page...=GenerationTypejavax.persistence.GenerationTypeJPA enumDefines the types of primary key generation strategies.See JavaDoc Reference Page....AUTOGenerationType.AUTOenum constantIndicates that the persistence provider should pick an 
7 appropriate strategy for the particular database.See JavaDoc Reference Page...) long id;
8     :
9}