使用@ComponentScan时,Spring引导在sibling-package中找不到JpaRepositories,或者在使用@EnableJpaRepositories时无法初始化它们

Question

我有一个由多个模块组成的maven项目.其中三个模块是

• "project-core"(包含模型类)
• "project-data"(包含Spring Data JPA存储库)
• "project-spring"(包含带有REST控制器的主Spring Boot App).

在启动时,我得到以下异常:

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.foo.bar.data.OrderRepository] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {}

我知道Spring Boot Applications默认只查看他们自己和他们的子包bean,但在这种情况下,bean是在兄弟包中.我已经尝试过@ComponentScan({"org.foo.bar.data"})在Application类中添加一个,但无济于事.

使用@EnableJpaRepositories(basePackages = {"org.foo.bar.data"})投掷

Caused by: java.lang.IllegalArgumentException: Not an managed type: class org.foo.bar.core.model.Order

我究竟做错了什么？

目录树(修剪)如下所示:

project
??? project-core
?   ??? src
?       ??? main
?           ??? java
?               ??? org
?                   ??? foo
?                       ??? bar
?                           ??? core
|                               ??? model
|                                   ??? Order.java
??? project-data
?   ??? src
?       ??? main
?           ??? java
?               ??? org
?                   ??? foo
?                       ??? bar
?                           ??? data
|                               ??? OrderRepository.java
?
??? project-spring
    ??? src
        ??? main
            ??? java
                ??? org
                    ??? foo
                        ??? bar
                            ??? spring
                                ??? Application.java

OrderRepository:

public interface OrderRepository extends JpaRepository<Order, Integer> {
    List<Order> findByDeliveryOverview(DeliveryOverview deliveryOverview);
    List<Order> findByDeliveryOverviewAndCustomer(DeliveryOverview deliveryOverview, Customer customer);
}

Application.java

@SpringBootApplication
@ComponentScan({"org.foo.bar.data"})
public class Application {
    private static final Logger log = LoggerFactory.getLogger(Application.class);

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

Answer 1

主要问题是你的结构.

要@EntityScan在应用程序类上扫描您需要的实体,并启用所需的存储库@EnableJpaRepositories.

@SpringBootApplication
@EntityScan({"org.foo.bar.core.model"})
@EnableJpaRepositories(basePackages = {"org.foo.bar.data"})
public class Application { ... }

但是,我建议将Application课程移至org.foo.bar,然后你只需要@SpringBootApplication它,因为它将从该目录开始扫描.