Example Hibernate entity in Scala

Topic.scala

/*
 * Topic Entity
 */
@Entity
@Table(uniqueConstraints = Array(new UniqueConstraint(columnNames=Array("application_id", "name"))))
@NamedQueries(Array(
  new NamedQuery(name="Topic.findAllByApplication", query="from Topic where application=:application"),
  new NamedQuery(name="Topic.findByApplicationAndName", query="from Topic where application=:application and name=:name")
))
class Topic {
  @Id @GeneratedValue
  var id: Long = _

  @ManyToOne(optional=false)
  var application: Application = _

  var created_at: Date = _
  var updated_at: Date = _

  var name: String = _
  var description: String = _

  var email_system_id: String = _
  var sms_system_id: String = _

  override def toString: String = "[Topic " + id + ": " + name + "]"
}

/*
 * Topic DAO
 */
object Topic {
  @Autowired val domainManager: DomainManager = _
  AppConfig.inject(this)

  def create(application: Application, name: String, description: String): Topic = {
    val topic = new Topic
    topic.application = application
    topic.name = name
    topic.description = description
    domainManager.save(topic)
    topic
  }

  def lookup(id: Long) = domainManager.get[Topic](id)

  def findAllByApplication(application: Application) = domainManager.findAll[Topic]("Topic.findAllByApplication", Map("application"->application))

  def findByApplicationAndName(application: Application, name: String) =
    domainManager.find[Topic]("Topic.findByApplicationAndName", Map("application"->application, "name"->name))

  def delete(topic: Topic) {
    domainManager.delete(topic)
  }
}