private void createEntityManagerFactory() {
 assert emfBuilder != null : "emfBuilder != null";
 assert dbCredentials != null : "dbCredentials != null";

 Map<String, String> dbCredentioals = dbCredentials.getDBCredentioals();
 entityManagerFactory = emfBuilder
 .createEntityManagerFactory(dbCredentioals);

 createCustomer();
 }

 public void bindDBConnectionService(IDatabaseCredentialsService dbService) {
 dbCredentials = dbService;
 if (emfBuilder != null) {
 createEntityManagerFactory();
 }
 }

 public void bindEMFBuilder(EntityManagerFactoryBuilder builder) {
 emfBuilder = builder;
 if (dbCredentials != null) {
 createEntityManagerFactory();
 }
 }