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接口的代码库，就像下面这样：
import org.springframework.data.mongodb.repository.MongoRepository;
import org.springframework.stereotype.Repository;
@Repository
public interface HotelRepository extends MongoRepository<Hotel,String> {
}
但是，每当我在HotelRepository中添加一个依赖项时，编译器就会给出错误提示：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();
}
}
我已经尽我所能从我的角度考虑所有问题来解决错误，但却徒劳无功。这是我所研发的。
HotelRepository会默认提供一个实现，根据 Spring 文档。- 我已经用
@Repository注释了接口，所以不需要放置@Component。 - 使用
@Autowired注释从 Spring 上下文添加依赖项，因此它应该从 Spring 上下文中获取创建的 bean。 - 所有必需的文件都在同一个包中，因此不需要放置
@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);
}
}
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>
有人能帮我看下吗？我错过了什么？
@EnableMongoRepositories(basePackages = "your.repository.package")注解。 - StanislavL@SpringBootApplication后面添加注解。 - StanislavL