找不到MongoRepository的bean（Spring Boot）

Question

我使用的是spring boot和MongoDB 。

Spring version : 4.3.9

Spring boot version : 1.5.4

我正在創建一個實現MongoRepository interface的存儲庫，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，每當我向HotelRepository編譯器添加依賴項時，在com.demo.HotelController中提供錯誤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();
    }
}

我已經檢查了我身邊的所有方面來解決錯誤，但都是徒勞的。 我研發的是什么。

• 對於HotelRepository ，將提供開箱即用的默認實現。 按照春季文檔
• 我用@Repository注釋了接口，所以不需要放@Component
• 使用@Autowired注釋從spring上下文添加依賴項，因此它應該從spring上下文中選擇創建的bean。
• 所有必需的文件都在同一個包中，因此不需要放置@ComponentScan

這是我的主要春季啟動應用程序類：

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

堆棧跟蹤 ：

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>

有人可以幫幫我，我錯過了什么？

Answer 1

面對類似的問題，將以下內容添加到Application類幫助我解決了這個問題

@EnableMongoRepositories(basePackageClasses = DeviceDataRepository.class)

在你的情況下它可能是

@SpringBootApplication
@EnableMongoRepositories(basePackageClasses = HotelRepository.class)
public class MongoWithBootApplication{ ... }

Answer 2

我遇到了同樣的問題

在代碼下方用於掃描mongorepository包

@SpringBootApplication                                                       
@EnableMongoRepositories(basePackages = {"//packages you want to scan for activiting mongo repositories"})
public class SpringBootMongoDBApp{ ... }

它解決了我的問題

Answer 3

經過這么多的斗爭，我終於解決了這個問題。

代碼或注釋沒有任何問題。 問題是spring boot的版本 。

但是，我仍然不確定1.5.1.RELEASE以上版本中的錯誤。如果有人知道根本原因可以編輯或回答問題。

問題 ：如果我添加spring-boot-starter-parent上述1.5.1.RELEASE ，它給了我上面沒有豆錯誤MongoRepository 。 它給出了從1.5.2到1.5.4版本的錯誤。 （ 1.5.4是最后一個版本，直到我嘗試過並面臨無bean錯誤）

解決方案 ：如果我添加spring-boot-starter-parent 1.5.1.RELEASE或更低版本（ 1.5.0是最低版本，直到我嘗試過），它運行正常。

Answer 4

我有相同的結構，我只需添加此配置：

Application.java

@Configuration
@SpringBootApplication
public class Application extends SpringBootServletInitializer {
    ...
}

application.properties

spring.data.mongodb.uri=mongodb://localhost:27017/hotelDB

並且存儲庫包必須位於Application.java類的更深層次。 就這樣

com.hotelDB
    Application.java
    repository (Package)
    controller (Package)
    service (Package)
    ...

Answer 5

我們需要使用EnableMongoRepositories激活mongo存儲庫

@SpringBootApplication
@EnableMongoRepositories //specify packages to scan
public class MongoWithBootApplication{ ... }

Answer 6

剛試過，並沒有發現任何問題與我現有的spring boot mongodb項目1.5.4.RELEASE for spring-boot-starter-parent 。

之前它配置了1.4.0.RELEASE 。