Major Description
I have an entity with a map element collection where the map value is an Embeddable.
@Embeddable
public class LocalizedString {
private String language;
private String string;
// getters and setters omitted
}
@Entity
public class MultilingualString {
@Id
private long id;
@ElementCollection(fetch=FetchType.EAGER)
private Map<String, LocalizedString> map = new HashMap<String, LocalizedString>();
}
Given a persistent instance m of my entity, I update a member of a given map value and then merge the modified entity:
EntityManager em = ...;
em.getTransaction().begin();
m.getMap().get("en").setString("foo");
em.merge(m)
em.getTransaction().commit();
The problem is, the state change of the map does not get saved to the database. With DEBUG logging on, I can see that the flush on commit does not trigger any SQL UPDATE.
To force the update, I have to put a new value into the map instead of just changing the existing one.
EntityManager em = ...;
em.getTransaction().begin();
m.getMap().put("en"), new LocalizedString("en", "foo"));
em.merge(m)
em.getTransaction().commit();
After this change, I do see the expected UPDATE.
My Embeddable does have hashCode() and equals() implemented such that the changed map is not equal() to the former version in either case.
This looks like a bug in the dirty-checking logic in OpenJPA.