Java @PreUpdate的使用问题

我有以下课程：

    @MappedSuperclass
public abstract class MappedModel
{
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "id", nullable = false, unique = true)
    private Long mId;

    @Temporal(TemporalType.TIMESTAMP)
    @Column(name = "rec_created_dtm", nullable = false, updatable = false)
    private Date recordCreatedDTM;

    @Column(name = "rec_cre_user_id", nullable = true, updatable = false)
    private Long recordCreatedUserId;

    @Temporal(TemporalType.TIMESTAMP)
    @Column(name = "last_update_dtm", nullable = false)
    private Date lastUpdateDTM;

    @Column(name = "last_update_user_id", nullable = true)
    private Long lastUpdateUserId;

//  @PrePersist
//  protected void onCreate()
//  {
//      this.lastUpdateDTM = this.recordCreatedDTM = new Date();
//  }
//
//  @PreUpdate
//  protected void onUpdate()
//  {
//      lastUpdateDTM = new Date();
//  }

  @PrePersist
  @PreUpdate
  protected void updateDates() {
    if (this.recordCreatedDTM == null) {
        this.recordCreatedDTM = new Date();
    }
    lastUpdateDTM = new Date();
  }

我的所有实体类都使用该类

所以我有下面的课程

@Entity
@Table(name="customer")
public class Customer extends MappedModel implements Serializable
{

    /**
   * 
   */
  private static final long serialVersionUID = -2543425088717298236L;


    @OneToOne(fetch=FetchType.EAGER, cascade=CascadeType.ALL)
    @JoinColumn(name="address_id",nullable=true,updatable=true,insertable=true)
    private Address mAddress;

及

因此，当我创建新客户时，会出现以下错误：

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.dao.DataIntegrityViolationException: not-null property references a null or transient value: vsg.ecotrak.dataaccess.domain.Address.lastUpdateDTM; nested exception is org.hibernate.PropertyValueException: not-null property references a null or transient value: vsg.ecotrak.dataaccess.domain.Address.lastUpdateDTM

org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:583)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:511)
javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)

---

我做错了什么

PrePersist和

PreUpdate

回调在

MappedSuperclass

中工作。。。至少在使用JPA提供的

EntityManager

API时是这样，这在您的案例中并不清楚

---

您使用的是

EntityManager

还是

会话

API？在后一种情况下，使用JPA的

PrePersist

，

PreUpdate

注释进行注释的方法将不会被调用（我的建议是使用）。

请提供异常的完整堆栈跟踪。我认为您对

PreUpdate

或

PrePersist

没有问题。消息

not null属性引用了一个null或暂时值：vsg.ecotrak.dataaccess.domain.Address.lastUpdateDTM

表示

lastUpdateDTM

为

null

，并且可能在触发任何

@Pre…

方法之前休眠失败。使用会话-不使用有意义的JPAwell-猜我错过了在文档中-谢谢，实际上，我们可以使用JPA回调和Hibernate会话：

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.dao.DataIntegrityViolationException: not-null property references a null or transient value: vsg.ecotrak.dataaccess.domain.Address.lastUpdateDTM; nested exception is org.hibernate.PropertyValueException: not-null property references a null or transient value: vsg.ecotrak.dataaccess.domain.Address.lastUpdateDTM

org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:583)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:511)
javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)