public static SessionFactory getSessionFactory() {
        if (sessionFactory == null) {
            try {
                Map<String, String> settings = new HashMap<>();
                settings.put(Environment.URL, "jdbc:mysql://localhost:3306/developers");
                settings.put(Environment.USER, "root");
                settings.put(Environment.PASS, "");
                settings.put(Environment.DIALECT, "org.hibernate.dialect.MySQLDialect");
                settings.put(Environment.DRIVER, "com.mysql.jdbc.Driver");

                StandardServiceRegistryBuilder builder = new StandardServiceRegistryBuilder().applySettings(settings);


                registry = builder.build();

                MetadataSources sources = new MetadataSources(registry);

                Metadata metadata = sources.getMetadataBuilder().build();

                sessionFactory = metadata.getSessionFactoryBuilder().build();
            } catch (Exception ex) {
                System.out.println("Возникла ошибка создания фабрики сессий! " + ex);
            }
        }

        return sessionFactory;
    }