JPA 2.1 and UUID

Recently I came over to map a table in a Postgres Database that contains a UUID Column. With JPA 2.1 there is a very simple way to map this column to the java.util.UUID-Field in the entity:

At first you need a AttributeConverter:

/**
 * Converter for use with UUID and Postgres
 */
@Converter(autoApply = true)
public class UuidConverter implements AttributeConverter<UUID, UUID> {  
  /**
   * Convert entity field to db column value
   *
   * @param attribute field
   * @return UUID of entity
   */
  @Override
  public UUID convertToDatabaseColumn(UUID attribute) {
    return attribute;
  }

  /**
   * Convert db column value to entity field
   *
   * @param dbData column
   * @return UUID of entity
   */
  @Override
  public UUID convertToEntityAttribute(UUID dbData) {
    return dbData;
  }
}

And now just add this Converter to your Entity-Fields with the @Column-Annotation:

@Column(name = "guid", columnDefinition = "UUID", updatable = false, insertable = false)
private UUID uuid;

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