Java – Hibernate: myinterceptor #onflushdirty will never be called

Question: why never call myinterceptor #onflushdirty?

I extend abstractentitymanagerfactorybean in XML configuration

<bean id="myEntityManagerFactory" parent="abstractEntityManagerfactorybean" abstract="true">
  <property name="entityInterceptor">
    <bean class="xxxx.MyInterceptor"/>
  </property>
</bean>
<bean id="abstractEntityManagerfactorybean" class="xxxx.MyEntityManagerfactorybean"/>

MyEntityManagerfactorybean

public class MyEntityManagerfactorybean extends AbstractEntityManagerfactorybean implements LoadTimeweaverAware {
  private Interceptor entityInterceptor;

  public Interceptor getEntityInterceptor() {
    return entityInterceptor;
  }

  public void setEntityInterceptor(Interceptor interceptor) {
    entityInterceptor = interceptor;
  }
}

MyInterceptor：

public class MyInterceptor extends EmptyInterceptor {

    public MyInterceptor() {
        System.out.println("init"); // Works well 
    }
    // PROBLEM - is never called
    @Override
    public boolean onFlushDirty(Object entity,Serializable id,Object[] currentState,Object[] prevIoUsState,String[] propertyNames,Type[] types) {

        if (entity instanceof File) {
            .....
        }
        return false;
    }
}

Update: [explain why customizing dirty policies doesn't seem to be my way]

I want to update the modification timestamp every time I change the content in the folder entity excel folderposition At the same time, folderposition should be persistent rather than transient (meaning that it causes the entity to become dirty)

Because I use spring transactional and Hibernate templates, there are some subtle differences:

1) I cannot update the modification timestamp at the end of each setter, such as:

public void setXXX(XXX xxx) {
  //PROBLEM: Hibernate templates collect object via setters,//means simple get query will cause multiple 'modified' timestamp updates
  this.xxx = xxx;
  this.modified = new Date();
}

2) I can't call setmodified manually because it has about 25 fields, and setXXX of each field is scattered throughout the application I have no right to restructure

@Entity
public class Folder {

  /**
   * GOAL: Changing of each of these fields except 'folderPosition' should cause 
   * 'modified' timestamp update
   */
  private long id;
  private String name;
  private Date created;
  private Date modified;
  private Integer folderLocation;

  @PreUpdate
  public void preUpdate() {
     //PROBLEM : change modified even if only location field has been changed!
     //PROBLEM: need to kNow which fields have been updated!
     modified = new Date(); 
  }   
  ....
}

Solution

You need to extend the finddirty method instead of onflushdirty See this tutorial for details by referring to the GitHub working example