java - com.example.controller.UserController 中的字段 userRepository 需要类型为 'com.example.repository.UserRepository' 的 bean，但无法找到

Question

我正在学习 Spring Boot，运行应用程序时出现此错误 说明:

Field userRepository in com.example.controller.UserController required a bean of type 'com.example.repository.UserRepository' that could not be found.

行动:

考虑在您的配置中定义“com.example.repository.UserRepository”类型的 bean。

所有包

启动.java

    package com.example;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

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

用户.java

package com.example.model;

import org.springframework.data.annotation.Id;

public class User {
    @Id
    private String id;
    private String name;
    private int age;
    private String email;
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public String getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }
}

UserRepository.java

    package com.example.repository;

    import org.springframework.data.mongodb.repository.MongoRepository;

    import com.example.model.User;

    public interface UserRepository extends MongoRepository<User, String>{

        public User findOneBy(String name);

    }

UserController.java

package com.example.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Repository;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import com.example.model.User;
import com.example.repository.UserRepository;

@Repository("com.example.repository")
@RestController
@RequestMapping("/user")
public class UserController {

    @Autowired
    UserRepository userRepository;

    //Create
    @RequestMapping(method = RequestMethod.POST, consumes = MediaType.APPLICATION_JSON_VALUE)
    public void createUser(@RequestBody User user){
        userRepository.save(user);
    }

    //Read
    @RequestMapping(value ="/{id}")
    public User readUser(@PathVariable String id){
        return userRepository.findOneBy(id);
    }

    //Update
    @RequestMapping(method = RequestMethod.PUT, consumes = MediaType.APPLICATION_JSON_VALUE)
    public void updateUser(User user){
        userRepository.save(user);
    }

    //Delete
    @RequestMapping(value ="/{id}", method = RequestMethod.DELETE)
    public void deleteUser(String id){
        userRepository.deleteById(id);
    }

}

我的日志是:

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v1.5.8.RELEASE)

2017-10-20 13:23:13.420  INFO 6060 --- [           main] com.example.Start                        : Starting Start on ANDRES-CASTANEDA with PID 6060 (C:\Users\andres.castaneda\Desktop\SpringBootMongoDB\SpringBootMongoDB\bin started by andres.castaneda in C:\Users\andres.castaneda\Desktop\SpringBootMongoDB\SpringBootMongoDB)
2017-10-20 13:23:13.422  INFO 6060 --- [           main] com.example.Start                        : No active profile set, falling back to default profiles: default
2017-10-20 13:23:13.471  INFO 6060 --- [           main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@6b0c2d26: startup date [Fri Oct 20 13:23:13 COT 2017]; root of context hierarchy
2017-10-20 13:23:14.635  INFO 6060 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2017-10-20 13:23:14.647  INFO 6060 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2017-10-20 13:23:14.648  INFO 6060 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.5.23
2017-10-20 13:23:14.769  INFO 6060 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2017-10-20 13:23:14.769  INFO 6060 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 1302 ms
2017-10-20 13:23:14.922  INFO 6060 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean  : Mapping servlet: 'dispatcherServlet' to [/]
2017-10-20 13:23:14.925  INFO 6060 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'characterEncodingFilter' to: [/*]
2017-10-20 13:23:14.926  INFO 6060 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2017-10-20 13:23:14.926  INFO 6060 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2017-10-20 13:23:14.926  INFO 6060 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'requestContextFilter' to: [/*]
2017-10-20 13:23:14.961  WARN 6060 --- [           main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userController': Unsatisfied dependency expressed through field 'userRepository'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.example.repository.UserRepository' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
2017-10-20 13:23:14.963  INFO 6060 --- [           main] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
2017-10-20 13:23:14.976  INFO 6060 --- [           main] utoConfigurationReportLoggingInitializer : 

Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2017-10-20 13:23:15.077 ERROR 6060 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

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

Description:

Field userRepository in com.example.controller.UserController required a bean of type 'com.example.repository.UserRepository' that could not be found.


Action:

Consider defining a bean of type 'com.example.repository.UserRepository' in your configuration.

我尝试了很多方法，但还是不行。

Answer 1

尝试添加 @EnableMongoRepositories到您的应用程序类，例如:

package com.example;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@EnableMongoRepositories("com.example.repopackage")
public class Start {
    public static void main(String[] args) {
        SpringApplication.run(Start.class, args);
    }
}

只要您的 MongoRepository 扩展位于应用程序类包下的包中，Spring 就会自动配置它们。否则，您必须使用此注释手动指定包。

您还需要从 Controller 中删除 @Repository 注释。 @Repository 只是另一个别名为 @Component 的构造型注释。