spring4+springmvc+hibernate3主键UUID无法生成 ?报错

我的entity文件是这样的

@Entity
@Table(name = "userinfo", schema = "designerdb", catalog = "")
public class UserinfoEntity {
    @Id
    @GeneratedValue(generator = "system-uuid")
    @GenericGenerator(name = "system-uuid", strategy = "uuid")
    @Column(length=32,nullable = false)
    private String userid;
    @Column(length=25)
    private String username;
    @Column(length=25)
    private String password;
    @Column(length=25)
    private String realname;
    @Column(length=2)
    private String sex;
    @Column(length=3)
    private Integer age;
    @Column(length=18)
    private String idnumber;
    @Column(length=11)
    private String telephone;
    @Column(length=100)
    private String emailAddress;
    @Column(length=25)
    private String phone;
    @Column(length=100)
    private String workPlace;

最后就是报错

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.hibernate.id.IdentifierGenerationException: ids for this class must be manually assigned before calling save(): com.springapp.model.UserinfoEntity
	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:978)
	org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:868)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
	org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:231)
	org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
	org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
	org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)