jpa - 如何访问非 bean 类中的 JpaRepository 接口

Question

我有一个 JpaRespository 接口，比如吹，

@Transactional
@Repository
public interface ProductRepository extends JpaRepository<Product, Long> {
    public Product findById(Long id);
    
}

我想从非容器托管类中使用此存储库方法，如下所示。

public class ProductFactory implements ITestFactory {

    private static ProductFactory instance = new ProductFactory();

    public static ProductFactory getInstance() {

        return instance;
    }

    private ProductFactory() {
    }

    @Override
    public Product getProduct(Long id) {
        // Need to access ProductRepository here
    }

    //.... remaining methods and logic
}

public interface ITestFactory {
    Product getProduct(Long id);
    //.. remaining methods
}

这里 ProductFactory 的 getInstance() 由我无权访问的平台（基于内部弹簧的平台）类调用。请告诉我如何访问这个工厂类方法中的存储库方法。

这是配置类，

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(basePackages = {
        "com.test.product"
        }, entityManagerFactoryRef = "productSource", transactionManagerRef = "txn_productSource")
public class RepoConfig {
}