Storing a tree of data (depth=3)

#1

Hi,

I would need a bit support for my MIT licensed Spring REST project where I already successfully
can persist books.

I have a problem with movies. The difference to the books? The depth of the data tree +1
I'll explain it here:

  • A movie is an entity (like the book)
  • A movie has a list of roles (I've tried @OneToMany, @Embedded and @ElementList)
  • A role is a performer (I've tried inside that class @Entity and @Embeddable) and a roleName (String)
  • There are other data like list of directors, list of composers, list of tags and each of them are entity with @OneToMany and are working fine (when I comment out the role part)
  • One intention is that performer finally results in a separate table so I can query the list over all performers.

When I'm trying to persist the movie the objectdb complains that It cannot "find" the performer or - depending on the annotations - it complains that one object is not an entity.

How do I have to organize the "role" thing that I get persisted correctly?

kind regards,
Thomas

APPENDIX:
I'm using lombok ...

@Entity
@Data
@NoArgsConstructor
@RequiredArgsConstructor
public class Performer implements Serializable {
  /** version of class. */
  private static final long serialVersionUID = 1L;

  /** full name of movie performer. */
  @Id
  @NonNull
  private String fullName;
}

@Embeddable
@Data
@NoArgsConstructor
@RequiredArgsConstructor
@Builder public class Role implements Serializable {
  /** version of class. */
  private static final long serialVersionUID = 1L;

  /** real name of person in life. */
  @NonNull
  @ManyToOne(cascade = CascadeType.MERGE)
  private Performer performer;

  /** rolen name of person in movie. */
  @NonNull
  private String roleName;
}
#2

Please post the exact error message (including exception stack trace).

ObjectDB Support
ObjectDB - Fast Object Database for Java (JPA/JDO)
#3

Not reproducable anymore. I wished I could say why ...
I closed the ticket.


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