Spring Boot应用程序-无法注册Bean

我刚刚创建了一个新的Spring-boot-starter项目，并且正在尝试使用MongoRepository（提及，因为我认为这可能与我的问题有关），并且我只有4个要运行的类，例如：

User.java

@Entity
public class User {

    @Column(name = "id")
    @Id
    private Long id;

    @Column(name = "name")
    private String name;

    @Column(name = "email")
    private String email;

    @Column(name = "password")
    private String password;
}

UserController.java

@RestController
public class UserController {

    @Autowired
    private UserRepository userRepository;

    @PostMapping("/AddUser")
    private ResponseEntity<?> getDistance(@RequestBody User user) throws Exception {
        userRepository.save(user);
        return ResponseEntity.ok(user);
    }
}

UserRepository.java

@Repository
public interface UserRepository extends MongoRepository<User, Long> {
}

启动类：

@SpringBootApplication
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

}

build.gradle

plugins {
    id 'org.springframework.boot' version '2.2.5.RELEASE'
    id 'io.spring.dependency-management' version '1.0.9.RELEASE'
    id 'java'
}

group = 'com.javademos'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '1.8'

repositories {
    mavenCentral()
}

dependencies {
    implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
    implementation 'org.springframework.boot:spring-boot-starter-web'
    compile group: 'org.springframework.boot', name: 'spring-boot-starter-data-mongodb', version: '2.2.5.RELEASE'
    implementation 'com.google.maps:google-maps-services:0.1.7'
    testImplementation('org.springframework.boot:spring-boot-starter-test') {
        exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
    }
}

test {
    useJUnitPlatform()
}

但是每次我运行代码时，都会出现一个异常：

***************************
APPLICATION FAILED TO START
***************************

Description:

The bean 'userRepository' could not be registered. A bean with that name has already been defined and overriding is disabled.

Action:

Consider renaming one of the beans or enabling overriding by setting spring.main.allow-bean-definition-overriding=true


Process finished with exit code 1

我已经仔细检查过，并且没有两次使用任何注释，尤其是@Repository。

我已经看到了这个问题，但仍然无法解决。

我只想知道为什么说

The bean 'userRepository' could not be registered. A bean with that name has already been defined and overriding is disabled.

虽然我的项目中只有一个存储库

问题来源：Stack Overflow