Issues with the usage of @PreUpdate

问题

I have the following class:

    @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();
  }

This class is used by all my entity classes.

So I have the following class

@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;

And

@Entity
@Table(name="address")
public class Address  extends MappedModel implements Serializable
{

    /**
   * 
   */
  private static final long serialVersionUID = -3505413538055124608L;

  @Column(name="address_line_1", length=150, nullable=false)
  private String mAddressLine;

  @Column(name="city", length=150, nullable=false)
  private String mCity;

  @Column(name="state", length=2, nullable=true)
  private String mState;

  @Column(name="postal_code", length=10, nullable=false)
  private String mPostalCode;

So, when I create a new customer I get the following error:

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)

What am I doing wrong here.

回答1:

The PrePersist and PreUpdate callbacks do work in a MappedSuperclass... at least when using the EntityManager API from JPA, which is not clear in your case.

Are you using the EntityManager or the Session API? In the later case, methods annotated using the PrePersist, PreUpdate annotations from JPA won't get called (and my suggestion would be to use a listener or an interceptor).

来源：https://stackoverflow.com/questions/4121628/issues-with-the-usage-of-preupdate

标签

java

hibernate

jpa

annotations