public String providerAddress(Provider p) {
    this.address = providerFacade.getProviderAddress(p);

    return "address";
  }
  public String findProvider(Long id) {
    this.provider = providerFacade.findProvider(id);

    return "provider";
  }
  public String allProviders() {
    this.providers = providerFacade.getAllProviders();

    return "providers";
  }
  public String createProvider() {
    this.address = new Address(street, city, cap, country);
    this.provider = providerFacade.createProvider(name, phoneNumber, email, vatin, address);

    return "provider";
  }