java - 库中存储库的 NoSuchBeanDefinitionException

Question

我创建了一个库，用于在多个 Spring Boot 应用程序上共享代码。

该库包含一个 Repository 类 RequestRepository。将库添加到 Spring Boot 项目后，编译并成功运行单元测试。

// Library: RequestRepository.java
package org.test.lib;

public interface RequestRepository extends CrudRepository<Request, Integer> {}

// Application: Application.java
package org.test.app;

@SpringBootApplication
@ComponentScan(basePackages = {"org.test.app", "org.test.lib"})
public class Application {
  // ...
}

当 Spring 尝试 Autowiring 存储库时，启动应用程序会引发 NoSuchBeanDefinitionException。

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'org.test.lib.repositories.RequestRepository' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}

我为组件扫描启用了 DEBUG 日志记录，并获得了有关存储库的以下输出。

2018-07-10 08:33:25.035 DEBUG 14976 --- [ main] .i.s.PathMatchingResourcePatternResolver : Resolved location pattern [classpath*:org/test/lib/**/*.class] to resources [URL [jar:file:/C:/Users/.../lib-request-1.0.0-SNAPSHOT.jar!/org/test/lib/repositories/RequestRepository.class], ...

我错过了什么吗？

Answer 1

您必须使用 @EnableJpaRepositories 显式启用 Spring Boot 应用程序外部的存储库。

@SpringBootApplication
@EnableJpaRepositories(basePackages = {"org.test.app", "org.test.lib"})
@ComponentScan(basePackages = {"org.test.app", "org.test.lib"})
public class Application {
  // ...
}

参见Spring guide .

By default, Spring Boot will enable JPA repository support and look in the package (and its subpackages) where @SpringBootApplication is located. If your configuration has JPA repository interface definitions located in a package not visible, you can point out alternate packages using @EnableJpaRepositories and its type-safe basePackageClasses=MyRepository.class parameter.

用于使用库集@EntityScan中的@Entity类。