static delegate for jpa em

ModelTx

    @Transactional
  public void persist() {
  ModelTx.persist(this);
  }

  @Transactional
  public void flush() {
    ModelTx.flush();
  }

  public static final EntityManager entityManager() {
    return ModelTx.entityManager();
  }

  @Transactional
  public void remove() {
    ModelTx.remove(this,TwImage.class);
  }

  @Transactional
  public TwImage merge() {
    return ModelTx.merge(this);
  }