spring 未找到来自 Maven 依赖项的引导 @repository bean

Question

我正在使用 spring-data-mongoDB (w/o JPA) 处理多个 Spring 引导项目。一个包含公共（udc-common）组件、存储库和服务以及使用这些组件的其他（例如udc-gateway）。 udc-common 库在其他项目中被声明为 Maven 依赖项。（你会发现在这个post末尾附上了maven的详细配置）

环境结构

udc_common 项目

udc_common.models
udc_common.repositories
udc_common.services
udc_common.interfaces

udc_gateway 项目

udc_gateway.controllers
udc_gateway ....

gatewayApplication.java

网关pom.xml

<dependency>
    <groupId>org.open_si</groupId>
    <artifactId>udc-common</artifactId>
    <version>0.0.1-SNAPSHOT</version>
</dependency>

在 udc-gateway 项目中，我有一个引用 udc-comm SampleService 的休息控制器。当运行时我遇到错误

Parameter 0 of constructor in org.open_si.udc_common.services.SampleService required a bean of type 'org.open_si.udc_common.repositories.SampleRepository' that could not be found.

编码组织是：

控制器 (SamplesController) 属于网关项目
服务 (SampleService) 及其存储库 (SampleRepository) 属于 common 项目，在网关项目中被声明为 maven 依赖项

显然 SampleService 注入确实起作用，但它的 SampleRepository 依赖项不起作用。由于通用包是外部包，因此我在网关应用程序主 class

中相应地设置了 @componentscan

尝试过

@ComponentScan("org.open_si.udc_common")

和

@ComponentScan({
        "org.open_si.udc_common.repositories",
        "org.open_si.udc_common.services"
})

SampleService 相关的 SamplesController（gateway 项目）代码摘录是

@RestController
@RequestMapping("/samples")
public class SamplesController {

    @Autowired
    private SampleService service;
......

SampleService（普通项目）是

@Service
@EnableMongoRepositories
public class SampleService {

    @Autowired
    private SampleRepository sr;

    void insert(BaseSampleEntity sample) {
        this.sr.insert(sample);
    }
    public void delete(BaseSampleEntity sample) {
        this.sr.delete(sample);
    }
.....

或者也尝试过

@Service
@EnableMongoRepositories
public class SampleService {

    private final SampleRepository sr;

    public SampleService(SampleRepository repository) {
        sr = repository;
    }

    void insert(BaseSampleEntity sample) {
        this.sr.insert(sample);
    }
    public void delete(BaseSampleEntity sample) {
        this.sr.delete(sample);
    }

SampleRepository（common 项目）是

// @Repository (JPA only)
public interface SampleRepository extends MongoRepository<BaseSampleEntity, String> {

    List<BaseSampleEntity> findByNodeUuid(String Uuid, Sort sort, Pageable pageable);

    List<BaseSampleEntity> findByFieldUuid(String Uuid, Sort sort, Pageable pageable);

所以引发的异常

Parameter 0 of constructor in org.open_si.udc_common.services.SampleService required a bean of type 'org.open_si.udc_common.repositories.SampleRepository' that could not be found.

让我想到 spring 启动 IOC 过程中有问题。有什么想法吗？

在此先感谢您的帮助。

udc-common 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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.7.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <groupId>org.open_si</groupId>
    <artifactId>udc-common</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>UDC common</name>
    <packaging>jar</packaging>
    <description>Common resources for Universal Data Collector</description>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-mongodb</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.12</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter</artifactId>
            <version>RELEASE</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
<!--                    <source>1.8</source>-->
<!--                    <target>1.8</target>-->
                    <release>11</release>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

udc-网关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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.7.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>org.open_si</groupId>
    <artifactId>gateway</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>
    <name>Gateway</name>
    <description>Gateway for UDC project</description>

    <properties>
        <java.version>11</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.open_si</groupId>
            <artifactId>udc-common</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-amqp</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-mongodb</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-mail</artifactId>
        </dependency>
<!--        <dependency>-->
<!--            <groupId>org.springframework.boot</groupId>-->
<!--            <artifactId>spring-boot-starter-oauth2-client</artifactId>-->
<!--        </dependency>-->
<!--        <dependency>-->
<!--            <groupId>org.springframework.boot</groupId>-->
<!--            <artifactId>spring-boot-starter-oauth2-resource-server</artifactId>-->
<!--        </dependency>-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework.amqp</groupId>
            <artifactId>spring-rabbit-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>

Answer 1

Mb 你需要添加 Spring 数据依赖到 Maven

Answer 2

尝试在 spring 引导主应用程序 class 中添加以下注释（即 class 注释为 SpringBootApplication - GateWayApplication.java）

@EnableMongoRepositories(basePackages = "org.open_si.udc_common")
@ComponentScan("org.open_si.udc_common.services")
@EntityScan(basePackages ="org.open_si.udc_common.models")

此外，正如您提到的，您不需要使用 @Repository 注释存储库 class，因为它已经由 spring data

管理

更新： @SpringBootApplication本身嵌入了ComponentScan注解，所以它会自动扫描所有子目录下的所有class。

希望你的目录结构有点类似于

com.example
--controllers
    -- SamplesController
--service
    -- SampleService
SampleApplication (this is the class that contains @SpringBootApplication & @EnableMongoRepositories)

Answer 3

根据 Kumar V 的建议添加

@ComponentScan("org.open_si.udc_common.services")
@EnableMongoRepositories(basePackages = {"org.open_si.udc_common.repositories"})

在 gateway.application.java 成功了。

不幸的是，由于 org.open_si.udc_common.services 导入，我遇到了一个新问题：发送针对 SamplesController 的请求时，出现 HTTP 404 错误。当删除 udc-common-services 的 ComponentScan（以及控制器中对 SampleService 的引用）时，一切正常。

Springs 确实在木头下做了一些我不明白的东西。

spring 未找到来自 Maven 依赖项的引导 @repository bean

spring boot @repository bean from Maven dependency not found

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