remove related @OneToOne automatically in JPA

I'm using the following in JPA:

@Entity
class ParentClass {
  @Id
  @GeneratedValue
  private long id;
  ...
  @OneToOne(cascade = { cascade = { CascadeType.ALL }, 
                        mappedBy = "parentClass")
  ChildClass child;
  ..
}

@Entity
class ChildClass {

  @OneToOne
  ParentClass 开发者_StackOverflowparentClass;

}

If I do a Query like createQuery("DELETE FROM ParentClass pc"), my child Class is not deleted automatically.

Can this be done with JPA-2.0? (I does work with @OneToMany relationships).

Bulk DML queries such as DELETE FROM ParentClass pc ignore cascading options and orphanRemoval, so if you actually need to do it in a bulk query, you can't configure JPA to delete ChildClasses automatically.

However, you can configure your database to do it by adding a REFERENCES ... ON DELETE CASCADE constraint to the foregin key of ChildClass in your database schema.

In JPA2 you can set orphanRemoval = true on @OneToOne annotation. However I would say that CascadeType.ALL should handle that. What if you call em.remove(parentClass) instead of calling query.