com.example.controller.UserController中的字段userRepository需要一個無法找到的'com.example.repository.UserRepository'類型的bean

我在學習Spring Boot，並在運行應用程序時遇到此錯誤說明：在com.example.controller.UserControllercom.example.controller.UserController中的字段userRepository需要一個無法找到的'com.example.repository.UserRepository'類型的bean

場userRepository所需類型的豆「com.example.repository.UserRepository」，可能不會被發現。

操作：

考慮您的配置定義類型 'com.example.repository.UserRepository' 的豆。

所有包裝

Start.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); 
    } 
}

User.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); 
    } 

}

我的日誌：

. ____   _   __ _ _ 
/\\/___'_ __ _ _(_)_ __ __ _ \ \ \ \ 
(()\___ | '_ | '_| | '_ \/ _` | \ \ \ \ 
\\/ ___)| |_)| | | | | || (_| | )))) 
    ' |____| .__|_| |_|_| |_\__, |//// 
=========|_|==============|___/=/_/_/_/ 
:: 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[email protected]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.

我已經嘗試了很多事情，但它仍然無法正常工作。

來源

2017-10-20 Andres Castañeda Marin

是你的'開始'類真的在那個包？ Spring Boot在同一個包中掃描'MongoRepository'類型，或者在'@ SpringBootApplication'註釋類中掃描「子包」。您可以用'@ EnableMongoRepositories'定製它的搜索位置。 –

嘗試增加@EnableMongoRepositories到您的應用程序類，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); 
    } 
}

只要你MongoRepository擴展名是在包裝應用程序類的封裝下面，那麼Spring將自動配置它們。否則，您必須使用此批註手動指定包。

您還想從控制器中刪除@Repository註釋。 @Repository只是另一個刻板標註，別名爲@Component。

來源

2017-10-20 18:11:13 Brian

它仍然不起作用 –

沒有更多的日誌信息，我不能真正幫你。你能從日誌中獲得完整的堆棧跟蹤並將它們添加到你的問題中嗎？確保你抓住所有這些，以防MongoDB的連接問題導致你的問題。 – Brian

也許，你應該：

把你所有的中包含Start.java包文件（壞的解決方案，但它的工作，我明白了什麼事情）在Start.java
使用註釋@EnableJpaRepositories
玩@SpringBootApplication(scanBasePackages={"com.test.pkg"})

來源

2017-11-25 08:41:07

com.example.controller.UserController中的字段userRepository需要一個無法找到的'com.example.repository.UserRepository'類型的bean

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