找不到用于MongoRepository的bean（Spring Boot）

Z时代
2024-01-10
分类：问答

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的存储库MongoRepositoryinterface，如下所示

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，都会出现错误 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();
    }
}

我已经从我的角度检查了所有方面，以解决该错误，但都是徒劳的。我研发的东西。

因为HotelRepository将会有一个默认的实现方式。根据Spring文件

我已经用注释了接口@Repository，所以不需要放@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。

所有必需的文件都放在同一包中，因此无需放入 @ComponentScan

这是我的主要spring boot应用程序类：

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);
    }
}

spring.data.mongodb.host=localhost
spring.data.mongodb.port=27017
spring.data.mongodb.database=HotelDB

：

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.

：

<?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>