Hi, I have two beans

@Entity(access=AccessType.FIELD)
public class BeanNameB implements Serializable {
 @Id(generate = GeneratorType.AUTO)
 private int id;

 private long creationtime;
 @PrePersist
 public void prePersist() {
 this.creationtime = System.currentTimeMillis();
 System.out.println("BeanNameB.prePersist");
 }
}

@Entity(access=AccessType.FIELD)
public class BeanNameA implements Serializable{
 @Id(generate = GeneratorType.AUTO)
 private int id;

 private long creationtime;

 @OneToOne(cascade = CascadeType.ALL)
 private BeanNameB beanNameB;

 public BeanNameA(){};

 public BeanNameA(long creationtime){
 this.creationtime=creationtime;
 beanNameB = new BeanNameB();
 }

 public void makeNewBeanNameB(){
 beanNameB = new BeanNameB();
 }
}

The prePersist callback in BeanNameB is called when creating the BeanNameA instance. But there is no prePersist callback when the BeanNameA instance is modified by the makeNewBeanNameB() method.

 BeanNameA bean = new BeanNameA(123);
 manager.persist(bean); //All ok here

 bean.makeNewBeanNameB();
 manager.flush(); //The new BeanNameB is created but no prePersist callback

Why there is no prePersist callback?