Spring Data JPA-未找到符合条件的Bean

Question

I am going to have a simple test with spring data jpa .

I have a simple pojo , an interface , and a runner application.

Here is my code:

package aa.bb.cc.repository;

@Repository
public interface ContentRepository extends CrudRepository<Content, Long>{
}

And, i have a simple POJO :

@Entity
@Table(name = "content")
public class Content {

public Content(String name, String title, String description) {
    this.name = name;
    this.title = title;
    this.description = description;
}

@NotNull
private String name;

@NotNull
private String title;

@NotNull
private String description;
...
}

And, Application class:

package aa.bb.cc.repository;

@SpringBootApplication
public class Application {

    private static final Logger log = LoggerFactory.getLogger(Application.class);

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

    @Bean
    public CommandLineRunner demo(ContentRepository repository) {
        return (args) -> {
            // save two contents
            repository.save(new Content("name1", "title1", "description1"));

            // fetch all Contents
            log.info("Contents found with findAll():");

            for (Content eachContent : repository.findAll()) {
                log.info(eachContent.toString());
            }
            log.info("");
        };
    }
}

My pom.xml :

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
    <groupId>com.h2database</groupId>
    <artifactId>h2</artifactId>
    <version>1.4.185</version>
</dependency>

I get this exception:

org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [aa.bb.cc.repository.ContentRepository] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {}

I saw some related problems but can't solve this problem. What is the solution?

UPDATE

spring-config.xml :

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:jpa="http://www.springframework.org/schema/data/jpa"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/data/jpa
       http://www.springframework.org/schema/data/jpa/spring-jpa.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context.xsd">

    <jpa:repositories base-package="aa.bb.cc.repository"/>

    <context:annotation-config/>

</beans>

Answer 1

Try to put ContentRepository , Content and Application in the same package. If tou need different packages, annotate Application with:

@EnableJpaRepositories("repository.package")
@EntityScan("entities.package")
@ComponentScan("other.components.package")

Answer 2

According to specializt answer you can add the @Repository annotation:

package aa.bb.cc.repository;

@Repository
public interface ContentRepository extends CrudRepository<Content, Long>{
}

Answer 3

Well your example works in my env without xml configuration. The two things that I had to fix was:

• Add no-parameter constructor
• Add identifier field with @Id annotation ( @Id private Long id = 5l; )

If you still have a problem with this, I can upload it to my github repository and post link here.

Answer 4

我建议阅读官方文档 ，您需要在spring配置中激活存储库软件包，如下所示：

<repositories base-package="aa.bb.cc.repository" />