如何为JpaRepository使用泛型？注入时遇多Bean冲突问题

我尝试通过泛型封装JpaRepository，实现核心代码与Spring Data JPA、Spring Boot解耦，用自定义处理器访问数据，但出现了Bean注入冲突错误：

字段com.ecobike.database.handler.CRUD中的repository需要单个Bean，但找到3个：

• customerRepository：定义于@EnableJpaRepositories标注的JpaRepositoriesRegistrar.EnableJpaRepositoriesConfiguration中的com.ecobike.database.repository.CustomerRepository
• dockRepository：定义于@EnableJpaRepositories标注的JpaRepositoriesRegistrar.EnableJpaRepositoriesConfiguration中的com.ecobike.database.repository.DockRepository
• repositoryProxy：定义于@EnableJpaRepositories标注的JpaRepositoriesRegistrar.EnableJpaRepositoriesConfiguration中的com.ecobike.database.repository.RepositoryProxy

解决方案建议 #

• 将其中一个Bean标记为@Primary，让Spring优先选择该Bean进行注入
• 更新消费端逻辑，使其支持接收多个Bean实例
• 使用@Qualifier注解指定要注入的具体Bean

代码示例 #

CustomerRepository.java

public interface CustomerRepository extends RepositoryProxy<Customer> {
}

DockRepository.java

public interface DockRepository extends RepositoryProxy<Dock> {
}

RepositoryProxy.java

public interface RepositoryProxy<T> extends JpaRepository<T, Long> {
}

CRUD.java

@Component
public class CRUD<T> {
    @Autowired
    private JpaRepository<T, Long> repository;

    public void create(T object) {
    }

    public List<T> getAll() {
        return repository.findAll();
    }

    public T get(String id) {
        return null;
    }

    public void update(T object) {
    }

    public void delete(T object) {
    }
}

CustomerDBHandler.java

public class CustomerDBHandler extends CRUD<Customer> {
    @Getter
    private static final CustomerDBHandler instance = new CustomerDBHandler();
}

DockDBHandler.java

public class DockDBHandler extends CRUD<Dock> {
    @Getter
    private static final DockDBHandler instance = new DockDBHandler();
}

内容的提问来源于stack exchange，提问作者vcth4nh