找不到MongoRepository的bean（Spring Boot） [英] could not found bean for MongoRepository (Spring Boot)
问题描述
我正在使用 spring boot 和 MongoDB 。
Spring version : 4.3.9
Spring boot version : 1.5.4
我正在创建一个实现 MongoRepository的存储库 interface ，如下所示
I am creating a repository which implements MongoRepository interface, like below
import org.springframework.data.mongodb.repository.MongoRepository;
import org.springframework.stereotype.Repository;
@Repository
public interface HotelRepository extends MongoRepository<Hotel,String> {
}
但是，每当我向HotelRepository编译器添加依赖项时都会出错 com.demo.HotelController中的字段hotelRepository需要找不到找不到的com.demo.HotelRepository类型的bean。
But, whenever I am adding a dependency to HotelRepository compiler giving the error Field hotelRepository in com.demo.HotelController required a bean of type 'com.demo.HotelRepository' that could not be found.
@RestController
@RequestMapping("/hotel")
public class HotelController {
@Autowired
private HotelRepository hotelRepository;
@GetMapping("/all")
public List<Hotel> getAllHotels(){
return this.hotelRepository.findAll();
}
}
我已经检查了我身边的所有方面解决错误，但一切都是徒劳的。我有什么R& D.
I've examine all the aspects from my side to resolve the error but all in vain. What I've R&D.
- 对于
HotelRepository，会有一个默认值开箱即用的实施。 按照春季文档 - 我用
@Repository注释了接口，所以不需要把@Component - 使用
@Autowired注释从spring上下文添加依赖项，因此它应该从spring上下文中选择创建的bean。 - 所有所需文件在同一个包中，因此无需放入
@ComponentScan
- For
HotelRepositorythere will be a default implementation provided out of the box. as per spring docs - I've annotated the interface with
@Repository, so no need to put@Component - Adding dependency from spring context using
@Autowiredannotation, So it should pick created bean from spring context. - All the required files are in the same package, so no need to put
@ComponentScan
这是我的主要春季启动应用程序类：
Here is my main spring boot application class :
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class MongoWithBootApplication {
public static void main(String[] args) {
SpringApplication.run(MongoWithBootApplication.class, args);
}
}
application.properties：
spring.data.mongodb.host=localhost
spring.data.mongodb.port=27017
spring.data.mongodb.database=HotelDB
堆栈跟踪：
2017-07-10 13:25:12.485 INFO 4712 --- [ main] com.demo.MongoWithBootApplication : Starting MongoWithBootApplication on KELLGGNCPU0313 with PID 4712 (D:\STS_WS\MongoWithBoot\target\classes started by mehrajuddin.malik in D:\STS_WS\MongoWithBoot)
2017-07-10 13:25:12.487 INFO 4712 --- [ main] com.demo.MongoWithBootApplication : No active profile set, falling back to default profiles: default
2017-07-10 13:25:12.519 INFO 4712 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@13acb0d1: startup date [Mon Jul 10 13:25:12 IST 2017]; root of context hierarchy
2017-07-10 13:25:13.448 INFO 4712 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2017-07-10 13:25:13.456 INFO 4712 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2017-07-10 13:25:13.456 INFO 4712 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.15
2017-07-10 13:25:13.541 INFO 4712 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2017-07-10 13:25:13.541 INFO 4712 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1025 ms
2017-07-10 13:25:13.635 INFO 4712 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2017-07-10 13:25:13.637 INFO 4712 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2017-07-10 13:25:13.638 INFO 4712 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2017-07-10 13:25:13.638 INFO 4712 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2017-07-10 13:25:13.638 INFO 4712 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2017-07-10 13:25:13.673 WARN 4712 --- [ main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'hotelController': Unsatisfied dependency expressed through field 'hotelRepository'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.demo.HotelRepository' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
2017-07-10 13:25:13.675 INFO 4712 --- [ main] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2017-07-10 13:25:13.684 INFO 4712 --- [ main] utoConfigurationReportLoggingInitializer :
Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2017-07-10 13:25:13.737 ERROR 4712 --- [ main] o.s.b.d.LoggingFailureAnalysisReporter :
***************************
APPLICATION FAILED TO START
***************************
Description:
Field hotelRepository in com.demo.HotelController required a bean of type 'com.demo.HotelRepository' that could not be found.
Action:
Consider defining a bean of type 'com.demo.HotelRepository' in your configuration.
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.demo</groupId>
<artifactId>MongoWithBoot</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>MongoWithBoot</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.4.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-data-mongodb</artifactId>
</dependency>
<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>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
有人可以帮我在这里，我错过了什么？
Could someone please help me out here what am I missing?
推荐答案
经过这么多的努力，终于我解决了这个问题。
After so much of struggle, finally I've resolved the problem.
代码或注释没有任何问题。 问题是春季启动的版本。
There is nothing wrong in the code or annotation. The problem was spring boot's version.
但是，我仍然不确定上面的版本中有什么问题 1.5.1.RELEASE 。如果有人知道根本原因可以编辑或回答问题。
However, I am still not sure what is the wrong in the version above 1.5.1.RELEASE .If anybody knows the root cause can edit or answer the question.
问题：如果我在<$上面添加 spring-boot-starter-parent c $ c> 1.5.1.RELEASE ，它为我提供了 MongoRepository 的上述无bean错误。它从 1.5.2 到 1.5.4 版本提供错误。 （ 1.5.4 是最后一个版本，直到我尝试过并面临无豆错误）
Problem : If I add spring-boot-starter-parent above 1.5.1.RELEASE, it gives me the above no bean error for MongoRepository. It gives error from 1.5.2 to 1.5.4 version. (1.5.4 was the last version till that I've tried and faced the no bean error)
解决方案：如果我添加 spring-boot-starter-parent 1.5.1.RELEASE 或以下（ 1.5.0 是最低版本，直到我尝试过）。
Solution : It runs fine if I add spring-boot-starter-parent 1.5.1.RELEASE or below (1.5.0 was lowest version till I've tried).
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