问JPA -> Hibernate不生成自动id

EN

@Entity
public class Location implements Serializable {

  private static final long serialVersionUID = 1L;

  // startRegion attributes
  @Id
  @GeneratedValue(strategy=GenerationType.AUTO)
  private int id = 0;

  @ManyToOne(fetch = FetchType.LAZY)
  private Location parent = null;

  @Column(nullable=false)
  private boolean active = false;

  @OneToMany(mappedBy="parent", cascade=CascadeType.ALL, fetch=FetchType.LAZY)
  private Set<Location> divisions = null;

  @OneToMany(mappedBy="location", fetch=FetchType.EAGER, cascade=CascadeType.ALL)
  @MapKey(name="localeId")
  private Map<String, Location_i18n> descriptions = new HashMap<String, Location_i18n>();

  @Column(nullable=true, length=150)
  private String path = null;

  @Column(nullable=true, length=20)
  private String prismaCode = null;

  @Column(nullable=true, length=5)
  private String shortCode = null;
}

insert into Location (active, parent_id, path, prismaCode, shortCode) values (?, ?, ?, ?, ?)

  <property name="hibernate.dialect" value="org.hibernate.dialect.SQLServer2008Dialect"/>
  <property name="hibernate.show_sql" value="true"/>
  <property name="hibernate.hbm2ddl.auto" value="validate"/>
  <property name="hibernate.connection.driver_class" value="com.microsoft.sqlserver.jdbc.SQLServerDriver"/>