字段需要一个在springboot中找不到的bean答案

【问题标题】：Field required a bean which could not be found in springboot字段需要一个在springboot中找不到的bean
【发布时间】：2018-08-19 07:49:27
【问题描述】：

我正在创建一个基本的 Spring Boot REST API。我的项目结构如下：

com.anonreporting.springboot --- SpringBootAnonReporting.java , config.java

com.anonreporting.springboot.controller -- userController.java

com.anonreporting.springboot.domain -- User.java

com.anonreporting.springboot.service -- UserService.java UserServiceImpl.java

com.anonreporting.springboot.repository -- userRepository.java

SpringBootAnonReporting.java

    @SpringBootApplication
public class SpringBootAnonReporting {


    public static void main(String[] args) throws ParseException {
        ApplicationContext applicationContext = SpringApplication.run(SpringBootAnonReporting.class, args);

        for (String name : applicationContext.getBeanDefinitionNames()) {
            System.out.println(name);
        }
    }
}

User.java 是一个 POJO 类。

用户控制器

@Controller
public class UserController {

    @Autowired
    UserService userService;

    @RequestMapping(value="/users",method=RequestMethod.GET)
    ResponseEntity<Iterable<User>> listAllUsers()
    {
        return new ResponseEntity<Iterable<User>>(userService.listAllUsers(),HttpStatus.OK);
    }

    @RequestMapping(value="/newuser",method=RequestMethod.POST)
    ResponseEntity registerUser(User user)
    {
        userService.saveUser(user);
        return new ResponseEntity(HttpStatus.CREATED);
    }

    @RequestMapping(value="/get",method=RequestMethod.GET)
    ResponseEntity<String> tryGet()
    {
        System.out.println("hihihih");
        return new ResponseEntity<String>("HI",HttpStatus.OK);
    }

}

用户服务：

@Service
public interface UserService {

    Iterable<User> listAllUsers();

    User getUserById(String id);

    User saveUser(User user);

    void deleteUser(String id);


}

UserServiceImpl：

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserRepository userRepository;



    @Override
    public Iterable<User> listAllUsers() {
        // TODO Auto-generated method stub
        return userRepository.findAll();
    }

    @Override
    public User getUserById(String id) {
        // TODO Auto-generated method stub
        return userRepository.findOne(id);
    }

    @Override
    public User saveUser(User user) {
        // TODO Auto-generated method stub
        return userRepository.save(user);
    }

    @Override
    public void deleteUser(String id) {
        // TODO Auto-generated method stub
        userRepository.delete(id);

    }

}

config.java

@Configurable
@Configuration
@EnableAutoConfiguration
@EnableTransactionManagement
public class Config {
    public @Bean(destroyMethod = "close") AerospikeClient aerospikeClient() {

        ClientPolicy policy = new ClientPolicy();
        policy.failIfNotConnected = true;
        policy.timeout = 2000;

        return new AerospikeClient(policy, "172.28.128.3", 3000);
    }

    public @Bean AerospikeTemplate aerospikeTemplate() {
        return new AerospikeTemplate(aerospikeClient(), "test");
    }
}

UserRepository.java：

@Component
public interface UserRepository extends AerospikeRepository<User, String> {

}

pom.xml：

    <?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.example</groupId>
    <artifactId>anonReporting</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>anonReporting</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <!-- https://mvnrepository.com/artifact/com.aerospike/aerospike-client -->
        <dependency>
            <groupId>com.aerospike</groupId>
            <artifactId>aerospike-client</artifactId>
            <version>4.1.9</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
        </dependency>


        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
        </dependency>

                <!-- https://mvnrepository.com/artifact/org.springframework.data/spring-data-commons-core -->
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-commons-core</artifactId>
            <version>1.4.1.RELEASE</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.data/spring-data-commons -->
    <dependency>
        <groupId>org.springframework.data</groupId>
        <artifactId>spring-data-commons</artifactId>
        <version>2.0.9.RELEASE</version>
    </dependency>


        <!-- https://mvnrepository.com/artifact/com.aerospike/spring-data-aerospike -->
        <dependency>
            <groupId>com.aerospike</groupId>
            <artifactId>spring-data-aerospike</artifactId>
            <version>1.2.1.RELEASE</version>
        </dependency>


        <!-- https://mvnrepository.com/artifact/org.springframework/spring-beans -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
         </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.data/spring-data-keyvalue -->
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-keyvalue</artifactId>

        </dependency>

                <!-- https://mvnrepository.com/artifact/commons-cli/commons-cli -->
<dependency>
    <groupId>commons-cli</groupId>
    <artifactId>commons-cli</artifactId>
    <version>1.2</version>
</dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

运行代码时出现如下错误：

  ***************************
APPLICATION FAILED TO START
***************************

Description:

Field userRepository in com.anonreporting.springboot.user.UserServiceImpl required a bean of type 'com.anonreporting.springboot.user.UserRepository' that could not be found.


Action:

Consider defining a bean of type 'com.anonreporting.springboot.user.UserRepository' in your configuration.

我尝试过的：

所有其他包都是 com.anonreporting.springboot 的子包，所以我不必对它们使用组件扫描（如果我错了，请纠正我）。
我也尝试过使用 componentScan，但没有成功。
将所有内容移动到同一个包中确实有帮助，但我只想以这种方式构建它。我正在使用带弹簧靴的areospike。
我也尝试过更改依赖项的版本。

任何建议都会很有帮助。谢谢

【问题讨论】：

UserRepository.java 在哪里？
你创建了 UserRepository 类了吗？
在发布问题时忘记添加 userRepository，我的代码中有它。我已经编辑了问题，请查看它。
也许您应该将 UserRepository 中的注释从 @Component 切换到 @Repository，因为 UserRepository.java 是一个存储库
@S.Tushinov，我尝试改变它，但仍然得到同样的错误

标签： java spring maven spring-boot aerospike

【解决方案1】：

据我所知，您还没有创建 UserRepository.java。 Spring 无法自动装配不存在的东西，因此您可以尝试在方便的包中创建它。它应该看起来像这样

@Repository
public interface UserRepository extends JpaRepository<User, Long>{}

【讨论】：

在发布问题时忘记添加 userRepository，我的代码中有它。我已经编辑了问题，请查看它。

【解决方案2】：

您需要将UserRepository.class 中的注释从@Component 更改为@Repository，因为spring-data 正在扫描@Repository 注释。

【讨论】：

我尝试改变它，但仍然得到同样的错误

【解决方案3】：

问题仅出在 pom.xml 上。我刚刚用以下内容替换了我的 pom，一切正常。

    <?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.example</groupId>
    <artifactId>anonReporting</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>anonReporting</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.8.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>com.aerospike</groupId>
            <artifactId>spring-data-aerospike</artifactId>
            <version>1.0.2.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

【讨论】：