Question

I am learning Hibernate and I am stuck with annotations. I have a POJO Item:

@Entity
public class Item implements Serializable {

    @Id
    @GeneratedValue
    @Column
    protected Integer id;

    @Column
    protected State state;

    @ElementCollection
    protected Map<Locale, ItemBody> localization = new EnumMap<Locale, T>(Locale.class);

    ...

}

Locale is an enum of four items:

public enum Locale {
    cs, en, de, fr, es
}

ItemBody:

public class ItemBody implements Serializable {

    @Column(length = 256)
    protected String name;

    @Column(columnDefinition = "text")
    protected String description;

    @Column(columnDefinition = "text")
    protected String excerpt;

    ...
}

I use it as a key to attach translations of texts for Item.

Ideally, Hibernate would generate two classes:

 Item (id, state)
 ItemBody (item_id, localization_KEY, name, description, excerpt)

where in item_id and localization_KEY form together primary key.

What happens is that Hibernate generates:

 Item (id, state)
 ItemBody (item_id, localization, localization_KEY)

where localization is of type Bytea and is a serialization of all rows in ItemBody, instead of listing all the rows. I will appreciate any suggestion for what I am doing wrong.

Thanks!

Answer 1

You must annotate ItemBody with @Embeddable. Otherwise, Hibernate treats it as a serializable object.