Problems mapping UUID in JPA/hibernate

Question

According to the documentation, hibernate 3.6 should have support for the java.util.UUID type. But when I map it like:

@Id protected UUID uuid;

Answer 1

Using Hibernate 4 and MySQL 5.5 with an InnoDB table, I was able to store a UUID column as BINARY(16) as-is (no configuration or custom type required). I am not using this as the entity ID and am creating the value manually using UUID.randomUUID().

@Entity
@Table(name = "post")
public class PostModel implements Serializable
{
    ...
    @Column(name = "uuid", nullable = false, updatable = false)
    private UUID uuid;
    ...
}

> desc post;
+----------------+---------------+------+-----+---------------------+
| Field          | Type          | Null | Key | Default             |
+----------------+---------------+------+-----+---------------------+
| ...            |               |      |     |                     |
| uuid           | binary(16)    | YES  | UNI | NULL                |
| ...            |               |      |     |                     |
+----------------+---------------+------+-----+---------------------+