与组件分开的包装中的JpaRepository无法实现/注入

Z时代
2024-01-10
分类：问答

我有一个JpaRepository接口，当它与包含@ComponentScan的主类放在一个单独的包中时，Spring数据没有实现（或注入？）。

我的包结构（仅用于演示错误）：

- org.demo.jpa.myapp Application.java - org.demo.jpa.repo MyDomainObject.java MyRepository.java

MyRepository.java

public interface MyRepository extends JpaRepository<MyDomainObject, Long> { }

应用程序

@Configuration
@ComponentScan(basePackages="org.demo.jpa")
@EnableAutoConfiguration
public class Application {
    public static void main(String[] args) {
        ApplicationContext context = SpringApplication.run(Application.class, args);        
        if (context.getBean(MyRepository.class) == null){
            throw new NullPointerException("repo was not initialized!");
        }
    }                
}

例外

Exception in thread "main" 2014-09-01 11:20:26.336 INFO 6156 --- [ main] org.demo.jpa.myapp.Application : Started Application in 2.824 seconds (JVM running for 3.362) 2014-09-01 11:20:26.339 INFO 6156 --- [ Thread-1] s.c.a.AnnotationConfigApplicationContext : Closing org.springframework.context.annotation.AnnotationConfigApplicationContex t@5d50b632: startup date [Mon Sep 01 11:20:23 EDT 2014]; root of context hierarchy org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.demo.jpa.repo.MyRepository] is defined at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:319) at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:985) at org.demo.jpa.myapp.Application.main(Application.java:17)

当MyRepository和MyDomainObject与Application类位于同一程序包中时， 不会引发 此错误。

这使用的是spring-boot-starter-parent 1.1.5.RELEASE和spring-boot-starter-data-jpa。